Interference cancellation in a spread spectrum communication system
First Claim
1. A method for receiving a traffic signal in a code division multiple access communication system, the system transmitting a traffic signal over a shared spectrum, traffic signal having an associated code, the method comprising:
- receiving signals over the shared spectrum;
sampling the received signals to produce samples;
delaying the samples to produce a window, the window having evenly time spaced samples;
despreading the samples and determining a weight for each despread window sample using an adaptive algorithm, the adaptive algorithm providing a determination of an optimum weight for each of a plurality of despread components;
weighting the received signals using the determined weights; and
despreading the weighted received signals using a traffic code.
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Abstract
A code division multiple access communication system transmits a pilot and traffic signal over a shared spectrum. The pilot and traffic signal have an associated code and are received over the shared spectrum. The received signals are sampled and the samples are delayed to produce a window. A weighted value for each despread pilot code window sample is determined using an adaptive algorithm. Each window sample is despread with a traffic code. Each despread traffic code window sample is weighted according to a weight corresponding to its respective pilot code sample.
61 Citations
20 Claims
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1. A method for receiving a traffic signal in a code division multiple access communication system, the system transmitting a traffic signal over a shared spectrum, traffic signal having an associated code, the method comprising:
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receiving signals over the shared spectrum; sampling the received signals to produce samples; delaying the samples to produce a window, the window having evenly time spaced samples; despreading the samples and determining a weight for each despread window sample using an adaptive algorithm, the adaptive algorithm providing a determination of an optimum weight for each of a plurality of despread components; weighting the received signals using the determined weights; and despreading the weighted received signals using a traffic code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A user equipment for use in code division multiple access communication system, the system having a base station transmitting traffic signal over a shared spectrum, the traffic signal having an associated code, the user equipment comprising:
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means for receiving signals over the shared spectrum; means for sampling the received signals to produce samples; means for delaying the samples to produce a window, the window having evenly time spaced samples; means for despreading the samples; means for determining a weight for each despread window sample using an adaptive algorithm, the adaptive algorithm providing a determination of an optimum weight for each of a plurality of despread components; means for weighting the received signals using the determined weights; and means for despreading the weighted received signals using a traffic code. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification