Method and system for providing precise multi-function modulation

Claim 3

The method of claim 1 including the step of utilizing said samples to modulate a carrier signal.

Claim 4

The method of claim 1 including the step of converting said samples to corresponding analog signals.

Claim 5

The method of claim 3 including the step of filtering said analog signals.

Claim 6

The method of claim 4 including the step of modulating a carrier signal with said filtered analog signals.

Claim 7

The method of claim 1 wherein said step of providing a digitized time response from samples of a time domain representation of a spectrum profile of a selected modulation scheme includes the steps of: storing a plurality of digitized time responses from samples of time domain representations of a plurality of spectrum profiles corresponding to a plurality of modulation schemes and selecting one of said modulation schemes.

Claim 10

The method of claim 7 including the step of utilizing said L samples to modulate a carrier signal.

Claim 11

The method of claim 7 including the step of converting said L samples to corresponding in-phase and quadrature information-bearing analog signals A(t) and B(t) respectively.

Claim 12

The method of claim 9 including the step of filtering said in-phase and quadrature information-bearing analog signals A(t) and B(t).

Claim 13

The method of claim 10 including the step of modulating a carrier signal with said filtered information-bearing analog signals A(t) and B(t) to provide said modulation signal C(t).

Claim 14

The method of claim 7 wherein said step of providing a digitized time response from samples of a time domain representation of a spectrum profile of said selected modulation scheme includes the steps of; storing a plurality of digitized time responses from samples of time domain representations of a plurality of spectrum profiles corresponding to a plurality of modulation schemes and selecting one said modulation schemes.

Claim 15

A modulator for providing a modulation signal for a communication system in response to an input signal from a data source, said modulator comprising: means for providing a digitized time response from samples of a time domain representation of a spectrum profile of a selected modulation scheme; means for generating and storing a coefficient for each input symbol in accordance with said selected modulation scheme; and means for generating samples of an output signal, including means for generating each sample by: multiplying a predetermined number of said coefficients by a predetermined number of samples of said digitized time response to provide a number of products; and summing said products to provide one of said samples of said output signal.

Claim 16

A modulator for providing a modulation signal for a communication system in response to an input signal from a data source, said modulator comprising: means for providing a digitized time response from samples of a time domain representation of a spectrum profile of a selected modulation scheme; means for generating and storing a coefficient for each input symbol in accordance with said selected modulation scheme; and means for generating samples of an output signal, including means for generating each sample by: multiplying a predetermined number of said coefficients by a predetermined number of samples of said digitized time response to provide a number of products; and summing said products to provide one of said samples of said output signal.

Claim 17

The modulator of claim 13 including means for utilizing said samples to modulate a carrier signal.

Claim 18

The modulator of claim 13 including means for converting said samples to corresponding analog signals.

Claim 19

The modulator of claim 15 including means for filtering said analog signals.

Claim 20

The modulator of claim 16 including means for modulating a carrier signal with said filtered analog signals.

Claim 21

The modulator of claim 17 wherein said means for providing a digitized time response from samples of a time domain representation of a spectrum profile of a selected modulation scheme includes: means for storing a plurality of digitized time responses from samples of time domain representations of a plurality of spectrum profiles corresponding to a plurality of modulation schemes and means for selecting one of said modulation schemes.

Claim 22

A modulator for providing a modulation signal of the form C(t)=A(t)cos w c t+B(t)sin w c t, where C(t) denotes the resulting modulation at the carrier angular frequency w c , and A(t) and B(t) denote first and second baseband information-bearing signals respectively, and A(t)cos w c t and B(t)sin w c t represent in-phase and quadrature components of the modulation signal C(t) respectively, for a communication system in response to an input signal from a data source, said modulator including: means for generating and storing a set of in-phase quadrature coefficients a i and b i respectively for the ith input symbol in accordance with a selected modulation scheme; means for providing a digitized time response of the form h[js+kT], where j is the sample index within a symbol, k is the symbol count index, s is the sampling period and T is the symbol duration, from samples of a time domain representation of a spectrum profile of said selected modulation scheme; means for choosing a symbol range 2M; means for taking L samples per symbol of the digitized time response h(t) over said range of 2M symbols to provide 2ML samples; and means for generating L samples of the information-bearing signals A(t) and B(t), including means for generating each jth sample by: multiplying 2M in-phase coefficients a i and 2M quadrature coefficients b i by 2M samples of said digitized time response h(t) to provide 2M products for each of the signals A(t) and B(t) respectively; and summing said 2M products for each jth sample to provide one of the L samples of each signal A(t) and B(t) for each input symbol n; whereby the information-bearing signals take the form: ##EQU6## where n is the symbol number, j ranges over the sample range L and k ranges over the symbol range 2M.

Claim 23

A modulator for providing a modulation signal of the form C(t)=A(t)cos w c t+B(t)sin w c t, where C(t) denotes the resulting modulation at the carrier angular frequency w c , and A(t) and B(t) denote first and second baseband information-bearing signals respectively, and A(t)cos w c t and B(t)sin w c t represent in-phase and quadrature components of the modulation signal C(t) respectively, for a communication system in response to an input signal from a data source, said modulator including: means for generating and storing a set of in-phase quadrature coefficients a i and b i respectively for the ith input symbol in accordance with a selected modulation scheme; means for providing a digitized time response of the form h[js+kT], where j is the sample index within a symbol, k is the symbol count index, s is the sampling period and T is the symbol duration, from samples of a time domain representation of a spectrum profile of said selected modulation scheme; means for choosing a symbol range 2M; means for taking L samples per symbol of the digitized time response h(t) over said range of 2M symbols to provide 2ML samples; and means for generating L samples of the information-bearing signals A(t) and B(t), including means for generating each jth sample by: multiplying 2M in-phase coefficients a i and 2M quadrature coefficients b i by 2M samples of said digitized time response h(t) to provide 2M products for each of the signals A(t) and B(t) respectively; and summing said 2M products for each jth sample to provide one of the L samples of each signal A(t) and B(t) for each input symbol n; whereby the information-bearing signals take the form: ##EQU6## where n is the symbol number, j ranges over the sample range L and k ranges over the symbol range 2M.

Claim 24

The modulator of claim 19 wherein said means for providing a digitized time response from samples of a time domain representation of a spectrum profile of said selected modulation scheme includes: means for storing a plurality of digitized time responses from samples of time domain representations of a plurality of spectrum profiles corresponding to a plurality of modulation schemes and means for selecting one of said modulation schemes.

Claim 25

The modulator of claim 20 including means for utilizing said samples to modulate a carrier signal.

Claim 26

The modulator of claim 21 including means for converting said samples to corresponding analog signals.

Claim 27

The modulator of claim 22 including means for filtering said analog signals.

Claim 28

The modulator of claim 23 including means for modulating a carrier signal with said filtered analog signals.

Claim 29

A multi-function modulator for providing a modulation signal of the form C(t) A(t)cos w c t+B(t)sin w c t, where C(t) denotes the resulting modulation at the carrier angular frequency wc, and A(t) and B(t) denote baseband information-bearing signals, and A(t)cos w c t and B(t)sin w c t represent in-phase and quadrature components of the modulation signal C(t) respectively, for a communication system in response to an input signal from a data source, said modulator including: means for generating and storing a set of in-phase and quadrature coefficients a i and b i respectively for the ith input symbol in accordance with a selected modulation scheme; means for providing a digitized time response of the form h[js+kT], where j is the sample index within a symbol, k is the symbol count index, s is the sampling period and T is the symbol duration, from samples of a time domain representation of a spectrum profile of a plurality of modulation schemes including said selected modulation scheme; means for choosing a symbol range 2M; means for taking L samples per symbol of the digitized time response h(t) over said range of 2M symbols to provide 2ML samples; means for generating L samples of the information-bearing signals A(t) and B(t), including means for generating each jth sample by: multiplying 2M in-phase coefficients a i and 2M quadrature coefficients b i by 2M samples of said digitized time response h(t) to provide 2M products for each of the signals A(t) and B(t) respectively; and summing said 2M products for each jth sample to provide one of the L samples of each signal A(t) and B(t) for each input symbol n; whereby the information-bearing signals take the form: ##EQU7## where n is the symbol number, j ranges over the sample range L and k ranges over the symbol range 2M; and means for utilizing said samples to modulate a carrier signal.

Claim 30

A multi-function modulator for providing a modulation signal of the form C(t) A(t)cos w c t+B(t)sin w c t, where C(t) denotes the resulting modulation at the carrier angular frequency wc, and A(t) and B(t) denote baseband information-bearing signals, and A(t)cos w c t and B(t)sin w c t represent in-phase and quadrature components of the modulation signal C(t) respectively, for a communication system in response to an input signal from a data source, said modulator including: means for generating and storing a set of in-phase and quadrature coefficients a i and b i respectively for the ith input symbol in accordance with a selected modulation scheme; means for providing a digitized time response of the form h[js+kT], where j is the sample index within a symbol, k is the symbol count index, s is the sampling period and T is the symbol duration, from samples of a time domain representation of a spectrum profile of a plurality of modulation schemes including said selected modulation scheme; means for choosing a symbol range 2M; means for taking L samples per symbol of the digitized time response h(t) over said range of 2M symbols to provide 2ML samples; means for generating L samples of the information-bearing signals A(t) and B(t), including means for generating each jth sample by: multiplying 2M in-phase coefficients a i and 2M quadrature coefficients b i by 2M samples of said digitized time response h(t) to provide 2M products for each of the signals A(t) and B(t) respectively; and summing said 2M products for each jth sample to provide one of the L samples of each signal A(t) and B(t) for each input symbol n; whereby the information-bearing signals take the form: ##EQU7## where n is the symbol number, j ranges over the sample range L and k ranges over the symbol range 2M; and means for utilizing said samples to modulate a carrier signal.

Claim 31

The method of claim 4 including the step of providing a carrier signal modulated with said filtered analog signals by selecting a harmonic of said analog signals.

Claim 32

The method of claim 10 including the step of providing a carrier signal modulated with said filtered analog signals by selecting a harmonic of said analog signals.

Claim 33

The modulator of claim 15 including means for providing a carrier signal modulated with said analog signals, said means for providing a carrier signal modulated with said analog signal further including means for selecting a harmonic of said analog signals.

Claim 34

The modulator of claim 22 including means for providing a carrier signal modulated with said analog signals, said means for providing a carrier signal modulated with said analog signal further including means for selecting a harmonic of said analog signals.

Claim 35

The modulator of claim 29 wherein said means for modulating said carrier signal includes first and second bandpass filter means for selecting said harmonic from the outputs of said first and second information-bearing signals A(t) and B(t) respectively.

Claim 36

The modulator of claim 30 further including means for summing the outputs of said first and second bandpass filters.

Claim 37

The modulator of claim 31 further including upconverter means for upconverting the output of said summing means to provide said modulated signal C(t).