Method and apparatus for canceling signals in a spread-spectrum communication system
First Claim
Patent Images
1. A method of canceling noise in a spread-spectrum communication system, the method comprising the steps of:
- receiving a composite signal comprising a multiplicity of frequency and time overlapping coded signals from remote units in communication with a serving base station, the composite signal additionally comprising a signal from a remote unit not in communication with the serving base station;
receiving information from a non-serving base station regarding the signal from the remote unit not in communication with the serving base station, wherein the information received from the non-serving base station comprises a despread transmission from the remote unit not in communication with the serving base station;
producing a cancellation signal representative of the signal from the remote unit not in communication with the serving base station based on the information received from the non-serving base station; and
producing a composite signal substantially free of the signal transmitted from the remote unit not in communication with the serving base station based on the cancellation signal.
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Abstract
A subscriber'"'"'s signal (117) is removed from a composite signal (120) received in a serving base station (100), where the subscriber (113) is not in communication with the serving base station (100). The subscriber'"'"'s signal (117) is removed from the composite signal (120) by receiving information regarding potential interferers in communication with the non-serving base stations (150). Next, a most reliable signal is determined from the potential interferers in communication with non-serving base stations (150-155). The most reliable signal is then removed from the composite signal (120).
91 Citations
14 Claims
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1. A method of canceling noise in a spread-spectrum communication system, the method comprising the steps of:
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receiving a composite signal comprising a multiplicity of frequency and time overlapping coded signals from remote units in communication with a serving base station, the composite signal additionally comprising a signal from a remote unit not in communication with the serving base station; receiving information from a non-serving base station regarding the signal from the remote unit not in communication with the serving base station, wherein the information received from the non-serving base station comprises a despread transmission from the remote unit not in communication with the serving base station; producing a cancellation signal representative of the signal from the remote unit not in communication with the serving base station based on the information received from the non-serving base station; and producing a composite signal substantially free of the signal transmitted from the remote unit not in communication with the serving base station based on the cancellation signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method of canceling signals in a spread-spectrum communication system, the method comprising the steps of:
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receiving a composite signal comprising a multiplicity of frequency and time overlapping coded signals from remote units in communication with a serving base station, the composite signal additionally comprising signals from remote units not in communication with the serving base station; receiving information from a non-serving base station regarding the signals from the remote units not in communication with the serving base station wherein the information received from the non-serving base station comprises despread transmissions from the remote units not in communication with the serving base station; determining from the information, an identity of a first remote unit not in communication with the serving base station, the first remote unit having a most reliable signal; producing a cancellation signal representative of a signal transmitted from the first remote unit based on the determination; and producing a second signal based on the cancellation signal, the second signal comprising the composite signal substantially free of the signal transmitted from the first remote unit. - View Dependent Claims (7, 8)
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9. A method of canceling noise in a spread-spectrum communication system, the method comprising the steps of:
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receiving a composite signal in a first base station which is a non-serving base station, the composite signal comprising a multiplicity of frequency and time overlapping coded signals from remote units in communication with the first base station, the composite signal additionally comprising a signal transmitted from a remote unit in communication with a second base station which is a non-serving base station; receiving by the second base station the signal transmitted from the remote unit; receiving information from the second base station regarding the signal transmitted from the remote unit wherein the information received from the second base station comprises a despread transmission from the remote unit not in communication with the serving base station; and producing a cancellation signal representative of the signal transmitted from the remote unit not in communication with the serving base station based on the information received from the non-serving base station. - View Dependent Claims (10)
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- 11. An apparatus comprising a noise canceling unit having as an input a composite signal comprising a multiplicity of frequency and time overlapping coded signals from remote units in communication with a serving base station, the composite signal additionally comprising a signal from a remote unit not in communication with the serving base station, the noise canceling unit additionally having as an input information from a non-serving base station regarding the signal from the remote unit not in communication with the serving base station, wherein the information input from the non-serving base station comprises a despread transmission from the remote unit not in communication with the serving base station, the noise canceling unit outputting composite signal substantially free of the signal transmitted from the remote unit not in communication with the serving base station.
Specification