Interference cancellation in variable codelength systems for multi-access communication
First Claim
1. A method for cancelling interference effects of at least one high-rate subchannel at a low rate in a multi-rate communication system, the method comprising:
- configuring a processor to analyze a received signal to produce at least one low-rate symbol estimate from at least one low-rate descendant sub channel of the at least one high-rate subchannel;
configuring the processor to process the at least one low-rate symbol estimate with the received signal to cancel interference contributed by the at least one high-rate subchannel; and
configuring the processor to estimate the amplitude of the interference contributed by the at least one high-rate subchannel.
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Accused Products
Abstract
A receiver employs low-rate processing to synthesize the effect of high-rate interference in a received multi-rate signal. Each high-rate subchannel is analyzed on its low-rate descendents to produce symbol estimates for each low-rate symbol interval. The symbol estimates are applied to low-rate descendent subchannels, which are then combined to synthesize the effects of the high-rate interference. An interference canceller processes the synthesized interference with the received signal for producing an interference-cancelled signal. Alternatively, analogous steps may be applied at high-rate to analyze, synthesize, and cancel the effects of low-rate interference in a multi-rate signal.
23 Citations
14 Claims
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1. A method for cancelling interference effects of at least one high-rate subchannel at a low rate in a multi-rate communication system, the method comprising:
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configuring a processor to analyze a received signal to produce at least one low-rate symbol estimate from at least one low-rate descendant sub channel of the at least one high-rate subchannel; configuring the processor to process the at least one low-rate symbol estimate with the received signal to cancel interference contributed by the at least one high-rate subchannel; and configuring the processor to estimate the amplitude of the interference contributed by the at least one high-rate subchannel. - View Dependent Claims (2, 3, 4, 5)
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6. A method for processing at least one of high-rate subchannels and low-rate subchannels, the method comprising:
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configuring a processor to perform at least one of a high-rate analysis and a low-rate analysis for a plurality of coded subchannels in a received baseband signal; configuring the processor to calculate a signal-to-interference-and-noise ratio (SINR) for each of the plurality of coded subchannels; and configuring the processor to employ a function of the SINR for processing high-rate and low-rate subchannels in the received baseband signal. - View Dependent Claims (7)
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8. A method for cancelling interference effects of at least one high-rate subchannel at a low rate in a multi-rate communication system, the method comprising:
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configuring a processor to calculate at least one low-rate symbol estimate from at least one low-rate descendant subchannel of the at least one high-rate subchannel of a received signal; and configuring the processor to process the at least one low-rate symbol estimate with the received signal to cancel interference contributed by the at least one high-rate subchannel to produce an interference-cancelled signal, wherein configuring the processor to calculate comprises configuring the processor to feed back the interference cancelled signal to the step of configuring the processor to calculate to configure the processor to perform iterative interference cancellation.
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9. A method for cancelling interference effects of at least one low-rate subchannel at a high rate in a multi-rate communication system, the method comprising:
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configuring a processor to analyze the at least one low-rate subchannel on its high-rate ancestor subchannel for generating symbol estimates; configuring the processor to apply weighted symbol estimates to at least one synthesized high-rate ancestor subchannel to generate a plurality of high-rate interference signals; and configuring the processor to use a sequence of the plurality of high-rate interference signals to model the interference effects from a low-rate transmission. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification