Digital block processor for processing a plurality of transmission channels in a wireless radiotelephony system

Claim 2

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, a method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels; comprising the steps of: receiving a block of receive channels as a plurality of analog RF signals to be processed; converting the plurality of analog RF signals into a digitized time series; windowing the digitized time series into a plurality of defined frequency ranges equal to the number of defined channels; including: defining a window time span having an effective time duration less than a time duration of 1/4 cycle of a present baseband modulating frequency, and restricting frequency domain sidelobes produced by windowing to a value less than a minimum acceptable post detection signal to noise ratio, generating Fourier coefficients with fast Fourier transforms in response to the windowing in order to identify the information signals of the individual channels of the digitized time series by recovering from the Fourier coefficients instantaneous frequencies from each FM carrier in each individual frequency defined channel; including: performing at least a first moment calculation that incorporates power spectra offset from a channel center frequency by an amount at least equal to a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency, and excluding from the first moment calculation power spectra offset from a channel center frequency by an amount that exceeds a sum of a peak frequency, deviation of FM modulation and a highest value of a modulating frequency, recovering the individual voice channels from the instantaneous frequencies of each FM carrier.

Claim 3

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, the method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels, as claimed in claim 1: comprising the further step of: converting the block of RF signals into a very low frequency block IF signal by heterodyning techniques such that its low end frequency is coincident in frequency with a Fourier coefficient and its high end frequency is coincident with another Fourier coefficient and having added Fourier coefficients spaced symmetrically within the frequency range of the very low frequency block IF signal.

Claim 4

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, the method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels, as claimed in claim 1: comprising the further steps of: determining first moments of Fourier transform power spectra associated with each individual frequency defined channel, identifying individual spectra distorted by noise and interference and repeating the determination of first moments to generate an improved reduced noise content power spectra associated with individual frequency defined channels.

Claim 5

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, the method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels, as claimed in claim 1: comprising the further step of: limiting determination of the instantaneous frequencies of each FM carrier in each individual frequency defined channel to a FM frequency range known to have been transmitted.

Claim 6

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, a method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels; comprising the steps of: receiving a block of receive channels as a plurality of analog RF signals to be processed; converting the plurality of analog RF signals into a very low frequency block IF signal by heterodyning techniques and further converting the block IF signal into a digitized time series; windowing the digitized time series into a plurality of defined frequency ranges equal to the number of defined channels; including: defining a window time span having a time duration less than a time duration of 1/4 cycle of a present baseband modulating frequency, and restricting frequency domain sidelobes produced by windowing to a value less than a minimum acceptable post detection signal to noise ratio, generating Fourier coefficients with fast Fourier transforms in response to the windowing in order to identify the information signals of the individual channels of the digitized time series by recovering from the Fourier coefficients instantaneous frequencies from each FM carrier in each individual frequency defined channel; including: performing a plurality of passes of first moment calculation that incorporate power spectra offset from a channel center frequency by an amount at least equal to a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency to calculate an estimate of instantaneous frequency, and limiting the calculated estimate of instantaneous frequency to a maximum value known to have been transmitted; comparing a number of passes of first moment calculation to a required number of passes of first moment calculation; calculating a local mean power value for spectra nearest the calculated estimate of instantaneous frequency; computing a sum mask and threshold values relative to the spectra and identifying spectra values that are acceptable; recovering the individual voice channels from the instantaneous frequencies of each FM carrier.

Claim 7

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, a method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels; comprising the steps of: receiving a block of receive channels as a plurality of analog RF signals to be processed; converting the plurality of analog RF signals into a very low frequency block IF signal by heterodyning techniques and further converting the block IF signal into a digitized time series; windowing the digitized time series into a plurality of defined frequency ranges equal to the number of defined channels; including: defining a window time span having a time duration less than a time duration of 1/4 cycle of a present baseband modulating frequency, and restricting frequency domain sidelobes produced by windowing to a value less than a minimum acceptable post detection signal to noise ratio, generating Fourier coefficients with fast Fourier transforms in response to the windowing in order to identify the information signals of the individual channels of the digitized time series by recovering from the Fourier coefficients instantaneous frequencies from each FM carrier in each individual frequency defined channel; including: performing a plurality of passes of first moment calculation that incorporate power spectra offset from a channel center frequency by an amount at least equal to a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency to calculate an estimate of instantaneous frequency, and limiting the calculated estimate of instantaneous frequency to a maximum value known to have been transmitted; comparing a number of passes of first moment calculation to a required number of passes of first moment calculation; calculating a local mean power value for spectra nearest the calculated estimate of instantaneous frequency; computing a sum mask and threshold values relative to the spectra and identifying spectra values that are acceptable; recovering the individual voice channels from the instantaneous frequencies of each FM carrier.

Claim 8

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, a method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels, as claimed in claim 5; comprising the further step of: converting the block of RF signals into a very low frequency block IF signal by heterodyning techniques such that its low end frequency is coincident in frequency with a selected Fourier coefficient and its high end frequency is coincident with another Fourier coefficient above the selected Fourier coefficient and having added Fourier coefficients spaced symmetrically within the frequency range of the very low frequency block IF signal.

Claim 9

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, a method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels; comprising the steps of: receiving a block of receive channels as a plurality of analog RF signals to be processed; converting the plurality of RF signals into a very low frequency block IF signal and further converting the block IF signal into a digitized time series; windowing the digitized time series into a plurality of defined frequency ranges equal to the number of defined channels; including: defining a window time span having a time duration less than a time duration of 1/4 cycle of a present baseband modulating frequency, and restricting frequency domain sidelobes produced by windowing to a value less than a minimum acceptable post detection signal to noise ratio, generating Fourier coefficients with fast Fourier transforms in response, to the windowing in order to identify the information signals of the individual channels of the digitized time series by recovering from the Fourier coefficients instantaneous frequencies from each FM carrier in each individual frequency defined channel; including: relating the Fourier coefficients to the channel frequencies such that its low end frequency is coincident in frequency with a selected Fourier coefficient and its high end frequency is coincident with another Fourier coefficient higher than the selected Fourier coefficient and having added Fourier coefficients spaced symmetrically within the frequency range of the very low frequency block IF signal; performing a first moment calculation that incorporates power spectra offset from a channel center frequency by an amount at least equal to a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency, and excluding from the first moment calculation power spectra offset from a channel center frequency by an amount that exceeds a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency, recovering the individual voice channels from the instantaneous frequencies of each FM carrier with FM detection techniques.

Claim 10

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, a method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels; comprising the steps of: receiving a block of receive channels as a plurality of analog RF signals to be processed; converting the plurality of RF signals into a very low frequency block IF signal and further converting the block IF signal into a digitized time series; windowing the digitized time series into a plurality of defined frequency ranges equal to the number of defined channels; including: defining a window time span having a time duration less than a time duration of 1/4 cycle of a present baseband modulating frequency, and restricting frequency domain sidelobes produced by windowing to a value less than a minimum acceptable post detection signal to noise ratio, generating Fourier coefficients with fast Fourier transforms in response, to the windowing in order to identify the information signals of the individual channels of the digitized time series by recovering from the Fourier coefficients instantaneous frequencies from each FM carrier in each individual frequency defined channel; including: relating the Fourier coefficients to the channel frequencies such that its low end frequency is coincident in frequency with a selected Fourier coefficient and its high end frequency is coincident with another Fourier coefficient higher than the selected Fourier coefficient and having added Fourier coefficients spaced symmetrically within the frequency range of the very low frequency block IF signal; performing a first moment calculation that incorporates power spectra offset from a channel center frequency by an amount at least equal to a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency, and excluding from the first moment calculation power spectra offset from a channel center frequency by an amount that exceeds a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency, recovering the individual voice channels from the instantaneous frequencies of each FM carrier with FM detection techniques.

Claim 11

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, a method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels; comprising the steps of: receiving a block of receive channels as a plurality of analog RF signals to be processed; converting the plurality of analog RF signals into a very low frequency block IF signal and further converting the block IF signal into a digitized time series; windowing the digitized time series into a plurality of defined frequency ranges equal to the number of defined channels; including: defining a window time span having a time duration less than a time duration of 1/4 cycle of a present baseband modulating frequency, and restricting frequency domain sidelobes produced by windowing to a value less than a minimum acceptable post detection signal to noise ratio, generating Fourier coefficients with fast Fourier transforms in response to the windowing in order to identify the information signals of the individual channels of the digitized time series by recovering from the Fourier coefficients instantaneous frequencies from each FM carrier in each individual frequency defined channel; including: performing a first moment calculation that incorporates power spectra offset from a channel center frequency by an amount at least equal to a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency to calculate an estimate of instantaneous frequency, and limiting the calculated estimate of instantaneous frequency to a maximum value known to have been transmitted; recovering the individual voice channels from the instantaneous frequencies of each FM carrier.

Claim 12

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, a method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels; comprising the steps of: receiving a block of receive channels as a plurality of analog RF signals to be processed; converting the plurality of analog RF signals into a very low frequency block IF signal and further converting the block IF signal into a digitized time series; windowing the digitized time series into a plurality of defined frequency ranges equal to the number of defined channels; including: defining a window time span having a time duration less than a time duration of 1/4 cycle of a present baseband modulating frequency, and restricting frequency domain sidelobes produced by windowing to a value less than a minimum acceptable post detection signal to noise ratio, generating Fourier coefficients with fast Fourier transforms in response to the windowing in order to identify the information signals of the individual channels of the digitized time series by recovering from the Fourier coefficients instantaneous frequencies from each FM carrier in each individual frequency defined channel; including: performing a first moment calculation that incorporates power spectra offset from a channel center frequency by an amount at least equal to a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency to calculate an estimate of instantaneous frequency, and limiting the calculated estimate of instantaneous frequency to a maximum value known to have been transmitted; recovering the individual voice channels from the instantaneous frequencies of each FM carrier.

Claim 13

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, a method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels with a high degree of linearity; comprising the steps of: receiving a block of receive channels as a plurality of analog RF signals to be processed; converting the plurality of analog RF signals into a very low frequency block IF signal and converting the block IF signal into a digitized time series; windowing the digitized time series into a plurality of defined frequency ranges equal to the number of defined channels; including: defining a window time span having a time duration less than a time duration of 1/4 cycle of a present baseband modulating frequency, and restricting frequency domain sidelobes produced by windowing to a value less than a minimum acceptable post detection signal to noise ratio, generating Fourier coefficients with fast Fourier transforms in response to the windowing in order to identify the information signals of the individual channels of the digitized time series by recovering from the Fourier coefficients instantaneous frequencies from each FM carrier in each individual frequency defined channel; including: performing at least a first moment calculation that incorporates power spectra offset from a channel center frequency by an amount at least equal to a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency, and recovering the individual voice channels from the instantaneous frequencies of each FM carrier.

Claim 14

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, a method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels with a high degree of linearity; comprising the steps of: receiving a block of receive channels as a plurality of analog RF signals to be processed; converting the plurality of analog RF signals into a very low frequency block IF signal and converting the block IF signal into a digitized time series; windowing the digitized time series into a plurality of defined frequency ranges equal to the number of defined channels; including: defining a window time span having a time duration less than a time duration of 1/4 cycle of a present baseband modulating frequency, and restricting frequency domain sidelobes produced by windowing to a value less than a minimum acceptable post detection signal to noise ratio, generating Fourier coefficients with fast Fourier transforms in response to the windowing in order to identify the information signals of the individual channels of the digitized time series by recovering from the Fourier coefficients instantaneous frequencies from each FM carrier in each individual frequency defined channel; including: performing at least a first moment calculation that incorporates power spectra offset from a channel center frequency by an amount at least equal to a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency, and recovering the individual voice channels from the instantaneous frequencies of each FM carrier.

Claim 15

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, a method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels with a high degree of sensitivity; comprising the steps of: receiving a block of receive channels as a plurality of analog RF signals to be processed; converting the plurality of analog RF signals into a very low frequency block IF signal and further converting the block IF signal into a digitized time series; windowing the digitized time series into a plurality of defined frequency ranges equal to the number of defined channels; including: generating Fourier coefficients with fast Fourier transforms in response to the windowing in order to identity the information signals of the individual channels of the digitized time series by recovering from the Fourier coefficients instantaneous frequencies from each FM carrier in each individual frequency defined channel; including: performing at least a first moment calculation that incorporates power spectra offset from a channel center frequency by an amount at least equal to a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency, and excluding from the first moment calculation power spectra offset from a channel center frequency by an amount that exceeds a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency, recovering the individual voice channels from the instantaneous frequencies of each FM carrier.

Claim 16

In a Frequency Division Multiple Access (FDMA) wireless radiotelephone system using FM modulated signals, a method for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels with a high degree of sensitivity; comprising the steps of: receiving a block of receive channels as a plurality of analog RF signals to be processed; converting the plurality of analog RF signals into a very low frequency block IF signal and further converting the block IF signal into a digitized time series; windowing the digitized time series into a plurality of defined frequency ranges equal to the number of defined channels; including: generating Fourier coefficients with fast Fourier transforms in response to the windowing in order to identity the information signals of the individual channels of the digitized time series by recovering from the Fourier coefficients instantaneous frequencies from each FM carrier in each individual frequency defined channel; including: performing at least a first moment calculation that incorporates power spectra offset from a channel center frequency by an amount at least equal to a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency, and excluding from the first moment calculation power spectra offset from a channel center frequency by an amount that exceeds a sum of a peak frequency deviation of FM modulation and a highest value of a modulating frequency, recovering the individual voice channels from the instantaneous frequencies of each FM carrier.

Claim 19

A block receiver signal processing method applicable to an analog FM frequency domain multiple access (FDMA) wireless cellular radio telephone system using one FM carrier per channel and conveying a plurality of information signals occurring in substantially adjacent channels; comprising the steps of: receiving a block of receive channels as a plurality of analog RF signals to be processed, converting the block of analog RF signals into a block of IF signals by means of analog amplification, filtering and heterodyning methods, converting the block analog IF signal into a digitized time series by means of a high speed, high precision analog to digital converter, applying a window function to the digitized time series to produce acceptable levels of selectively, dynamic range, linearity and amplitude flatness, applying the windowed time series to a fast Fourier transform (FFT) processor to isolate, in frequency, individual channels in the block, detecting the FM signals based on a multi-pass first moment method using the FFT derived power spectra associated with each channel of interest. applying an expansion step of a companding process and de-emphasis low pass filtering for recovery of voice signals, identifying specific supervisory audio tones (SAT) that may be present, identifying a presence of signaling tone ST and decoding Manchester encoded data messages, formatting the digitized voice, and the information content of decoded data messages, SAT and ST for transmission by means of a digital data link, transmitting the channel information by means of digital data links to a central location, and interfacing the channel information with the digital bus structure at the control site.

Claim 20

A block receiver signal processing method applicable to an analog FM frequency domain multiple access (FDMA) wireless cellular radio telephone system using one FM carrier per channel and conveying a plurality of information signals occurring in substantially adjacent channels; comprising the steps of: receiving a block of receive channels as a plurality of analog RF signals to be processed, converting the block of analog RF signals into a block of IF signals by means of analog amplification, filtering and heterodyning methods, converting the block analog IF signal into a digitized time series by means of a high speed, high precision analog to digital converter, applying a window function to the digitized time series to produce acceptable levels of selectively, dynamic range, linearity and amplitude flatness, applying the windowed time series to a fast Fourier transform (FFT) processor to isolate, in frequency, individual channels in the block, detecting the FM signals based on a multi-pass first moment method using the FFT derived power spectra associated with each channel of interest. applying an expansion step of a companding process and de-emphasis low pass filtering for recovery of voice signals, identifying specific supervisory audio tones (SAT) that may be present, identifying a presence of signaling tone ST and decoding Manchester encoded data messages, formatting the digitized voice, and the information content of decoded data messages, SAT and ST for transmission by means of a digital data link, transmitting the channel information by means of digital data links to a central location, and interfacing the channel information with the digital bus structure at the control site.

Claim 21

The block receiver signal processing method as claimed in claim 12, wherein the step of detecting the FM signals is based on a multi-pass detection process, comprises the further steps of: generating estimates of the FM instantaneous frequency by means of a first moment calculation based on power spectra associated with the carrier frequency, using a power mask to reject power spectra, for the purpose of subsequent first moment calculations, that are excessively corrupted by noise and interference, limiting the estimates of instantaneous frequency to the maximum deviation known to have been transmitted.

Claim 22

In a wireless radio telephone system, apparatus connected for receiving voice and data signals in block form from a group of individual radio signals each incorporating a single FM carrier that is distinct in frequency; comprising a receiver assembly connected for processing the group of individual radio signals in the block form and converting the radio signals to an IF frequency; an analog-to-digital converter connected for converting the radio signal in the block form into a digital time series format; a window function processor connected for applying a window function to the digital time series; a fast Fourier transform processor operative and connected for isolating in frequency multiple spectra associated with each individual FM carrier in the block form; an FM detector connected for estimating an instantaneous frequency of individual FM carrier based on the first moment of power spectra associated with the individual FM carrier and recovering voice and signal information of each FM carrier; a detection circuit connected for recovering voice and data signals, SAT (supervisory audio tones) and manchester encoded data; a data link interface connected for formatting the voice and data signals for digital transmission to a control and processing location.

Claim 23

In a wireless radio telephone system, apparatus connected for receiving voice and data signals in block form from a group of individual radio signals each incorporating a single FM carrier that is distinct in frequency; comprising a receiver assembly connected for processing the group of individual radio signals in the block form and converting the radio signals to an IF frequency; an analog-to-digital converter connected for converting the radio signal in the block form into a digital time series format; a window function processor connected for applying a window function to the digital time series; a fast Fourier transform processor operative and connected for isolating in frequency multiple spectra associated with each individual FM carrier in the block form; an FM detector connected for estimating an instantaneous frequency of individual FM carrier based on the first moment of power spectra associated with the individual FM carrier and recovering voice and signal information of each FM carrier; a detection circuit connected for recovering voice and data signals, SAT (supervisory audio tones) and manchester encoded data; a data link interface connected for formatting the voice and data signals for digital transmission to a control and processing location.

Claim 24

In a wireless radio telephone system, as claimed in claim 14: wherein the fast Fourier transform processor is a discrete Fourier transform processor.

Claim 25

In a wireless radio telephone system, as claimed in claim 14: further including; the FM detector including apparatus for identifying Fourier spectra excessively corrupted by noise by subsequent recalculations of the first moment.

Claim 26

In the wireless radio telephone system, as claimed in claim 14: further including; the FM detector including apparatus for exploiting a correlation between errors in estimating the instantaneous frequency of the FM carrier and a magnitude of estimated frequency to compensate for the error.

Claim 27

A signal processing arrangement for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels; comprising: an analog processor for accepting a block composite signal containing the plurality of FM information signals from an antenna; an analog-to-digital processor to convert the single block of RF signals into a digitized time series; conversion circuitry for converting the block of RF signals into a very low frequency block IF signal having its low end frequency coincident in frequency with Fourier coefficient and its high end frequency coincident with another Fourier coefficient and having added Fourier coefficients spaced symmetrically within the frequency range of the very low frequency block IF signal; digital signal processing apparatus including stored program instructions for windowing the digitized time series and generating Fourier coefficients with fast Fourier transforms to identify the individual channels of the digitized time series by recovering instantaneous frequencies from each FM carrier in each individual frequency defined channel; and the stored instructions in digital signal processing apparatus operative to determine first moments of Fourier transform power spectra associated with each individual frequency defined channel and for identifying individual spectra distorted by noise and interference and repeating the determination of first moments to generate an improved reduced noise content associated with individual frequency defined channels; FM detection circuitry for recovering the individual voice channels from the instantaneous frequencies of each FM carrier.

Claim 28

A signal processing arrangement for processing a plurality of FM information signals occurring in substantially adjacent frequency defined channels; comprising: an analog processor for accepting a block composite signal containing the plurality of FM information signals from an antenna; an analog-to-digital processor to convert the single block of RF signals into a digitized time series; conversion circuitry for converting the block of RF signals into a very low frequency block IF signal having its low end frequency coincident in frequency with Fourier coefficient and its high end frequency coincident with another Fourier coefficient and having added Fourier coefficients spaced symmetrically within the frequency range of the very low frequency block IF signal; digital signal processing apparatus including stored program instructions for windowing the digitized time series and generating Fourier coefficients with fast Fourier transforms to identify the individual channels of the digitized time series by recovering instantaneous frequencies from each FM carrier in each individual frequency defined channel; and the stored instructions in digital signal processing apparatus operative to determine first moments of Fourier transform power spectra associated with each individual frequency defined channel and for identifying individual spectra distorted by noise and interference and repeating the determination of first moments to generate an improved reduced noise content associated with individual frequency defined channels; FM detection circuitry for recovering the individual voice channels from the instantaneous frequencies of each FM carrier.

Claim 29

The signal processing arrangement for processing a plurality of FM information signals as claimed in claim 18; wherein: the stored program instructions in the digital signal processing apparatus being operative to limit determination of the instantaneous frequencies of each FM carrier in each individual frequency defined channel known to have been transmitted.

Claim 30

In a wireless radio telephone system, signal processing apparatus for recovering individual signal channels from a group of telecommunication channels each incorporating a single FM modulated carrier per individual channel; comprising: an analog processor for accepting a block composite signal containing the plurality of FM information signals from an antenna; conversion circuitry for reducing the frequency of the block RF signal to a block IF signal; an Analog-to-Digital converter for converting the block IF signal to a digitized time series; window processing circuitry for applying a window function to the digitized time series; a transform processor for determining Fourier coefficients in response to the signal output of the window processing circuitry in order to frequency define individual FM modulated carriers of the block IF signal and including a stored program control including instructions for determining first moments of Fourier transform power spectra associated with each individual FM modulated carrier and for identifying individual spectra distorted by noise and interference and repeating the determination of first moments to generate an improved reduced noise content power spectra associated with individual FM modulated carriers; and demodulation circuitry for recovering the FM information signals.

Claim 31

In a wireless radio telephone system, signal processing apparatus for recovering individual signal channels from a group of telecommunication channels each incorporating a single FM modulated carrier per individual channel; comprising: an analog processor for accepting a block composite signal containing the plurality of FM information signals from an antenna; conversion circuitry for reducing the frequency of the block RF signal to a block IF signal; an Analog-to-Digital converter for converting the block IF signal to a digitized time series; window processing circuitry for applying a window function to the digitized time series; a transform processor for determining Fourier coefficients in response to the signal output of the window processing circuitry in order to frequency define individual FM modulated carriers of the block IF signal and including a stored program control including instructions for determining first moments of Fourier transform power spectra associated with each individual FM modulated carrier and for identifying individual spectra distorted by noise and interference and repeating the determination of first moments to generate an improved reduced noise content power spectra associated with individual FM modulated carriers; and demodulation circuitry for recovering the FM information signals.

Claim 32

In the wireless radio telephone system, signal processing apparatus as claimed in claim 20; wherein: the conversion circuitry being operative for converting the block of RF signals into a very low frequency block IF signal having its low end frequency coincident in frequency with a Fourier coefficient and its high end frequency coincident with another Fourier coefficient and having added Fourier coefficients spaced symmetrically within the frequency range of the very low frequency block IF signal.

Claim 35

In a wireless radio telephone system, a method of signal processing for recovering individual signal channels from a group of telecommunication channels each incorporating a single FM modulated carrier per individual channel; comprising the steps of: receiving a radio signal input as a single block of receive channels comprised of a plurality of analog RF signals to be processed: reducing frequency of the plurality of RF signals and and converting to a block IF signal; converting the block IF signal to a digitized time series; applying a window function to the digitized time series and deriving a window for each channel of the IF block signal; applying fast Fourier transform (FFT) processing to the digitized time series for determining Fourier coefficients for each individual window in order to define an instantaneous frequency for individual FM modulated carriers of the block IF signal; recovering the individual signal channels from the Fourier coefficients by; determining first moments of Fourier transform power spectra associated with each individual FM modulated carrier; identifying individual spectra distorted by noise and interference; and repeating the determination of first moments to generate an improved reduced noise content power spectra associated with individual FM modulated carriers.

Claim 36

In a wireless radio telephone system, a method of signal processing for recovering individual signal channels from a group of telecommunication channels each incorporating a single FM modulated carrier per individual channel; comprising the steps of: receiving a radio signal input as a single block of receive channels comprised of a plurality of analog RF signals to be processed: reducing frequency of the plurality of RF signals and and converting to a block IF signal; converting the block IF signal to a digitized time series; applying a window function to the digitized time series and deriving a window for each channel of the IF block signal; applying fast Fourier transform (FFT) processing to the digitized time series for determining Fourier coefficients for each individual window in order to define an instantaneous frequency for individual FM modulated carriers of the block IF signal; recovering the individual signal channels from the Fourier coefficients by; determining first moments of Fourier transform power spectra associated with each individual FM modulated carrier; identifying individual spectra distorted by noise and interference; and repeating the determination of first moments to generate an improved reduced noise content power spectra associated with individual FM modulated carriers.