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US5410568A
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CDMA/TDMA spread-spectrum communications system and method
Assignee: InterDigital Technology Corp
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Filing: 1993-11-03
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Granted: 1995-04-25
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Expires: 2013-11-03
Abstract
Abstract A spread-spectrum transmitter and receiver using code division multiple access with time division multiple access technology for spread-spectrum communications. At a base station, a spread-spectrum transmitter includes a multiplexer for time multiplexing a synchronization-code signal and a plurality of data signals, which may be encoded as a plurality-encoded data signals, to generate a time-multiplexed signal. A chip-code generator generates a chip-code signal which is modulo added with the time-multiplexed signal by an EXCLUSIVE-OR gate to generate a spread-spectrum-time-multiplexed signal. A transmitter transmits the spread-spectrum-time-multiplexed signal over a communications channel. A spread-spectrum receiver at the base station processes a plurality of spread-spectrum signals, received from a plurality of remote units in as time division sequence of spread-spectrum signals, using a despreader circuit to generate a time-division signal. A demultiplexer demultiplexes the time-division signal as a plurality of data signals or as a plurality of privacy-encoded data signals. A remote unit, which may be a handset, includes a despreader circuit for despreading the spread-spectrum-time-multiplexed signal as a time-multiplexed signal. A synchronization-code matched filter detects the synchronization-code signal embedded in the time-multiplexed signal and thereby generates a timing signal. A controller uses the timing signal to generate a control signal. The control signal controls a transmit-receive switch for switching an antenna between the despreader circuit to the transmitter at the remote unit.
Inventors
- 👤 Donald L. Schilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:12
CPC Classifications
H; H04; H04J; H04J13/00; H04B; H04B1/00; H04B1/69; H04B1/707; H04B7/00; H04B7/24; H04B7/26; H04B7/2618; H04L; H04L7/00; H04L7/04; H04L7/041; H04L7/043; H04L7/046
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
106 words
A method for spread-spectrum processing a plurality of data signals on a carrier frequency f o , comprising the steps of: generating a plurality of privacy-code signals; modulo adding each of the respective plurality of privacy-code signals to each of the plurality of data signals to generate a plurality of privacy-encoded data signals, respectively; generating a synchronization-code signal; time multiplexing the synchronization-code signal and the plurality of privacy-encoded-data signals, respectively, to generate a time-multiplexed signal; generating a chip-code signal; spread-spectrum processing the time-multiplexed signal with the chip-code signal as a spread spectrum-time-multiplexed signal; and transmitting the spread-spectrum-time-multiplexed signal on the carrier frequency over a communications channel.
Claim 2
Independent Claim
106 words
A method for spread-spectrum processing a plurality of data signals on a carrier frequency f o , comprising the steps of: generating a plurality of privacy-code signals; modulo adding each of the respective plurality of privacy-code signals to each of the plurality of data signals to generate a plurality of privacy-encoded data signals, respectively; generating a synchronization-code signal; time multiplexing the synchronization-code signal and the plurality of privacy-encoded-data signals, respectively, to generate a time-multiplexed signal; generating a chip-code signal; spread-spectrum processing the time-multiplexed signal with the chip-code signal as a spread spectrum-time-multiplexed signal; and transmitting the spread-spectrum-time-multiplexed signal on the carrier frequency over a communications channel.
Claim 3
Dependent Claim
51 words
The method as set forth in claim 1 wherein the step of transmitting includes the steps of: generating a carrier frequency; shifting the spread-spectrum-time-multiplexed signal to the carrier frequency; amplifying the spread-spectrum-time-multiplexed signal at the carrier frequency; and radiating the amplified spread-spectrum-time-multiplexed signal at the carrier frequency over the communications channel.
Claim 4
Independent Claim
68 words
A method for spread-spectrum processing a plurality of data signals on a carrier frequency, comprising the steps of: generating a synchronization-code signal; time multiplexing the synchronization-code signal and the plurality of data signals, respectively, to generate the time-multiplexed signal; spread-spectrum processing the time-multiplexed signal with a chip-code signal to generate a spread-spectrum-time-multiplexed signal; and converting the spread-spectrum-time-multiplexed signal to a form suitable for sending over a communications channel.
Claim 5
Independent Claim
68 words
A method for spread-spectrum processing a plurality of data signals on a carrier frequency, comprising the steps of: generating a synchronization-code signal; time multiplexing the synchronization-code signal and the plurality of data signals, respectively, to generate the time-multiplexed signal; spread-spectrum processing the time-multiplexed signal with a chip-code signal to generate a spread-spectrum-time-multiplexed signal; and converting the spread-spectrum-time-multiplexed signal to a form suitable for sending over a communications channel.
Claim 6
Dependent Claim
36 words
The method as set forth in claim 3 wherein the step of spread-spectrum processing includes the steps of: generating a chip-code signal; and spread-spectrum processing the time-multiplexed signal with the chip-code signal as the spread-spectrum-time-multiplexed signal.
Claim 7
Dependent Claim
51 words
The method as set forth in claim 3 wherein the step of converting includes the steps of: generating a carrier frequency; shifting the spread-spectrum-time-multiplexed signal to the carrier frequency; amplifying the spread-spectrum-tim-multiplexed signal at the carrier frequency; and radiating the amplified spread-spectrum-time-multiplexed signal at the carrier frequency over a communications channel.
Claim 8
Independent Claim
79 words
A method for spread-spectrum processing a spread-spectrum-time-division signal, wherein the spread-spectrum-time-division signal includes a plurality of spread-spectrum signals received sequentially in time from a plurality of remote units, comprising the steps of: despreading the spread-spectrum-time-division signal as a time-division signal; demultiplexing the time-division signal as a plurality of remote-privacy-encoded-data signals; generating a synchronization-code signal; generating a timing signal; a generating a plurality of remote-privacy-code signals; and decoding the plurality of remote-privacy-encoded-data signals, respectively, as a plurality of remote-data signals.
Claim 9
Independent Claim
79 words
A method for spread-spectrum processing a spread-spectrum-time-division signal, wherein the spread-spectrum-time-division signal includes a plurality of spread-spectrum signals received sequentially in time from a plurality of remote units, comprising the steps of: despreading the spread-spectrum-time-division signal as a time-division signal; demultiplexing the time-division signal as a plurality of remote-privacy-encoded-data signals; generating a synchronization-code signal; generating a timing signal; a generating a plurality of remote-privacy-code signals; and decoding the plurality of remote-privacy-encoded-data signals, respectively, as a plurality of remote-data signals.
Claim 10
Dependent Claim
36 words
The spread-spectrum receiver as set forth in claim 6 wherein the steps of despreading includes the steps of: generating a chip-code signal; and despreading using the chip-code signal the received spread-spectrum-time-division signal as the time-division signal.
Claim 11
Independent Claim
48 words
A method for spread-spectrum processing a spread-spectrum-time-division signal, wherein the spread-spectrum-time-division signal includes a plurality of spread-spectrum signals received sequentially in time from a plurality of remote units, comprising: despreading the spread-spectrum-time-division signal as a time-division signal; and demultiplexing the time-division signal as a plurality of remote-data signals.
Claim 12
Independent Claim
48 words
A method for spread-spectrum processing a spread-spectrum-time-division signal, wherein the spread-spectrum-time-division signal includes a plurality of spread-spectrum signals received sequentially in time from a plurality of remote units, comprising: despreading the spread-spectrum-time-division signal as a time-division signal; and demultiplexing the time-division signal as a plurality of remote-data signals.
Claim 13
Dependent Claim
35 words
The method as set forth in claim 8 wherein the steps of despreading includes the steps of: generating a chip-code signal; and despreading, using the chip-code signal, the received spread-spectrum-time-division signal as the time-division signal.
Claim 14
Independent Claim
65 words
A method for spread-spectrum processing a spread-spectrum-time-division signal, wherein the spread-spectrum-time-division signal includes a plurality of spread-spectrum signal received sequentially in time from a plurality of remote units, comprising the steps of: despreading the spread-spectrum-time-division signal as a time-division signal; demultiplexing the time-division signal as a plurality of remote-privacy-encoded data signals; and decoding the plurality of remote-privacy-encoded signals as a plurality of remote-data signals, respectively.
Claim 15
Independent Claim
65 words
A method for spread-spectrum processing a spread-spectrum-time-division signal, wherein the spread-spectrum-time-division signal includes a plurality of spread-spectrum signal received sequentially in time from a plurality of remote units, comprising the steps of: despreading the spread-spectrum-time-division signal as a time-division signal; demultiplexing the time-division signal as a plurality of remote-privacy-encoded data signals; and decoding the plurality of remote-privacy-encoded signals as a plurality of remote-data signals, respectively.
Claim 16
Dependent Claim
35 words
The method as set forth in claim 10 wherein the steps of despreading includes the steps of: generating a chip-code signal; and despreading, using the chip-code signal, the received spread-spectrum-time-division signal as the time-division signal.
Claim 17
Dependent Claim
29 words
The method as set forth in claim 11 wherein steps of synchronization includes the steps of: generating a synchronization code; and generating, using the synchronization-code signal a timing signal.
Claim 18
Dependent Claim
41 words
The method as set forth in claim 10 wherein the step of decoding includes the steps of: generating, using the timing signal a plurality of privacy-coded signals; and generating a synchronization code; and generating, using the timing signal, the synchronization-code signal.
Claim 19
Dependent Claim
42 words
The method as set forth in claim 10 wherein the steps of decoding includes the steps of: generating, using the timing signal, a plurality of privacy-code signals; and decoding the plurality of privacy-encoded data signals as a plurality of data signals, respectively.
Claim 20
Independent Claim
146 words
A method for receiving a spread-spectrum-time-multiplexed signal, having a synchronization signal and a plurality a privacy-encoded data signals including a first privacy-encoded-data signal, on a first carrier frequency, f 1 , and for spread-spectrum transmitting a remote-data signal on a second carrier frequency, f 2 , comprising the steps of: despreading a spread-spectrum-time-multiplexed signal as a time-multiplexed signal; generating, using a synchronization-code signal embedded in the time-multiplexed signal, a timing signal; generating, in response to the control signal, a first privacy-code signal; decoding the first privacy-encoded-data signal as a first data signal; generating, in response to the control signal, a remote-privacy-code signal; encoding the remote-data signal with the remote-privacy-code signal as a remote-privacy-encoded-data signal; generating a second chip-code signal; spread-spectrum processing the remote-privacy-encoded signal with the second chip-code signal as a spread-spectrum signal; and transmitting the spread-spectrum signal on the second carrier frequency, f 2 .
Claim 21
Independent Claim
146 words
A method for receiving a spread-spectrum-time-multiplexed signal, having a synchronization signal and a plurality a privacy-encoded data signals including a first privacy-encoded-data signal, on a first carrier frequency, f 1 , and for spread-spectrum transmitting a remote-data signal on a second carrier frequency, f 2 , comprising the steps of: despreading a spread-spectrum-time-multiplexed signal as a time-multiplexed signal; generating, using a synchronization-code signal embedded in the time-multiplexed signal, a timing signal; generating, in response to the control signal, a first privacy-code signal; decoding the first privacy-encoded-data signal as a first data signal; generating, in response to the control signal, a remote-privacy-code signal; encoding the remote-data signal with the remote-privacy-code signal as a remote-privacy-encoded-data signal; generating a second chip-code signal; spread-spectrum processing the remote-privacy-encoded signal with the second chip-code signal as a spread-spectrum signal; and transmitting the spread-spectrum signal on the second carrier frequency, f 2 .
Claim 22
Dependent Claim
32 words
The method as set forth in claim 15 wherein step of despreading includes: despreading, using the first chip-code signal, the received spread-spectrum-time-multiplexed signal as the time-multiplexed signal; and filtering the time-multiplexed signal.
Claim 23
Independent Claim
136 words
A method for receiving a spread-spectrum-time-multiplexed signal, having a synchronization-code signal and a plurality of privacy-encoded data signals including a first privacy-encoded data signal, at a first carrier frequency, and for spread-spectrum transmitting a remote-data signal at a second carrier frequency, comprising the steps of: despreading the spread-spectrum-time-multiplexed signal as a time-multiplexed signal; detecting in the time-multiplexed signal the synchronization-code signal and generating a timing signal; decoding, using the timing signal, the first privacy-encoded data signal embedded in the time-multiplexed signal as a first data signal; encoding, in response to the control signal, the remote-data signal with a remote-privacy-code signal as a remote-privacy-encoded data signal; spread-spectrum processing the remote-privacy-encoded data signal with a second chip-code signal to generate a spread-spectrum signal; and converting the spread-spectrum signal to a form suitable for sending over a communications channel.
Claim 24
Independent Claim
136 words
A method for receiving a spread-spectrum-time-multiplexed signal, having a synchronization-code signal and a plurality of privacy-encoded data signals including a first privacy-encoded data signal, at a first carrier frequency, and for spread-spectrum transmitting a remote-data signal at a second carrier frequency, comprising the steps of: despreading the spread-spectrum-time-multiplexed signal as a time-multiplexed signal; detecting in the time-multiplexed signal the synchronization-code signal and generating a timing signal; decoding, using the timing signal, the first privacy-encoded data signal embedded in the time-multiplexed signal as a first data signal; encoding, in response to the control signal, the remote-data signal with a remote-privacy-code signal as a remote-privacy-encoded data signal; spread-spectrum processing the remote-privacy-encoded data signal with a second chip-code signal to generate a spread-spectrum signal; and converting the spread-spectrum signal to a form suitable for sending over a communications channel.
Claim 25
Dependent Claim
41 words
The method as set forth in claim 17 wherein the step of despreading includes the steps of: generating a first chip-code signal; despreading, using the first chip-code signal, the received spread-spectrum-time-multiplexed signal as the time-multiplexed signal; and filtering the time-multiplexed signal.
Claim 26
Dependent Claim
56 words
The method as set forth in claim 17 wherein the step of decoding includes the steps of: storing, in response to the control signal, the first privacy-encoded data signal embedded in the time-multiplexed signal; generating, in response to the control signal, a privacy-code signal; and decoding the first privacy-encoded data signal as the first data signal.
Claim 27
Dependent Claim
41 words
The method as set forth in claim 17 wherein the step of encoding includes the steps of: generating, in response to the control signal, the remote-privacy-code signal; and encoding the remote-data signal with the remote-privacy-code signal as the remote-privacy-encoded data signal.
Claim 28
Dependent Claim
42 words
The method as set forth claim 17 wherein steps of spread-spectrum processing includes the steps of: storing the remote-privacy-encoded data signal; generating a second chip-code signal; and spread-spectrum processing the second privacy-encoded signal with the second chip-code signal as a spread-spectrum signal.
Claim 29
Independent Claim
92 words
A method for receiving a spread-spectrum-time-multiplexed signal, having a synchronization-code signal and a plurality of data signals including a first data signal, at a first carrier frequency, and for spread-spectrum transmitting a remote-data signal at a second carrier frequency, comprising the steps of: despreading the spread-spectrum-time-multiplexed signal as a time-multiplexed signal; detecting in time-multiplexed signal the synchronization-code signal and generating a control signal; spread-spectrum processing the remote-data signal with a second chip-code signal as a spread-spectrum signal; and converting the spread-spectrum signal to a form suitable for sending over a communications channel.
Claim 30
Independent Claim
92 words
A method for receiving a spread-spectrum-time-multiplexed signal, having a synchronization-code signal and a plurality of data signals including a first data signal, at a first carrier frequency, and for spread-spectrum transmitting a remote-data signal at a second carrier frequency, comprising the steps of: despreading the spread-spectrum-time-multiplexed signal as a time-multiplexed signal; detecting in time-multiplexed signal the synchronization-code signal and generating a control signal; spread-spectrum processing the remote-data signal with a second chip-code signal as a spread-spectrum signal; and converting the spread-spectrum signal to a form suitable for sending over a communications channel.
Claim 31
Dependent Claim
40 words
The method as set forth in claim 22 wherein said remote-despreader means includes the steps of: generating a first chip-code signal; despreading using the first chip-code signal the received spread-spectrum-time-multiplexed signal as the time-multiplexed signal; and filtering the time-multiplexed signal.
Claim 32
Dependent Claim
43 words
The method as set forth in claim 22 wherein the step of spread-spectrum processing includes the steps of: storing the remote-data signal; generating a second chip-code signal; and spread-spectrum processing the remote-data signal with the second chip-code signal to generate a spread-spectrum signal.
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