Advanced signal processors for interference cancellation in baseband receivers
First Claim
Patent Images
1. A multi-mode receiver, comprising:
- a channel decomposition module configured for performing a decomposition of a communication channel into a plurality of subchannels;
a baseband receiver comprising an upstream baseband processor and a downstream baseband processor; and
an interference canceller coupled between the upstream baseband processor and the downstream baseband processor;
wherein at least one of the channel decomposition module, the baseband receiver, and the interference cancellation system is configurable for processing multi-mode signals;
an interference selector coupled to the downstream baseband processor and configured for selecting subchannels that are likely to contribute interference to at least one signal of interest, for producing at least one selected interference symbol;
a synthesizer configured to synthesize a synthesized interference signal from the at least one selected interference symbol;
a channel emulator configured to produce an estimated interference signal from the synthesized interference signal;
a second upstream baseband processor coupled to the channel emulator and configured for producing an estimated received interference signal from the estimated interference signal; and
a canceller configured for orthogonally or obliquely projecting a signal output from the baseband receiver onto a subspace that is orthogonal or oblique to a subspace of the estimated received interference signal.
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Abstract
A multi-mode receiver includes a channel decomposition module (e.g., a Rake receiver) for separating a received signal into multipath components, an interference selector for selecting interfering paths and subchannels, a synthesizer for synthesizing interference signals from selected subchannel symbol estimates, and an interference canceller for cancelling selected interference in the received signal. At least one of the channel decomposition module, the synthesizer, and the interference canceller are configurable for processing multi-mode signals.
260 Citations
68 Claims
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1. A multi-mode receiver, comprising:
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a channel decomposition module configured for performing a decomposition of a communication channel into a plurality of subchannels; a baseband receiver comprising an upstream baseband processor and a downstream baseband processor; and an interference canceller coupled between the upstream baseband processor and the downstream baseband processor; wherein at least one of the channel decomposition module, the baseband receiver, and the interference cancellation system is configurable for processing multi-mode signals; an interference selector coupled to the downstream baseband processor and configured for selecting subchannels that are likely to contribute interference to at least one signal of interest, for producing at least one selected interference symbol; a synthesizer configured to synthesize a synthesized interference signal from the at least one selected interference symbol; a channel emulator configured to produce an estimated interference signal from the synthesized interference signal; a second upstream baseband processor coupled to the channel emulator and configured for producing an estimated received interference signal from the estimated interference signal; and a canceller configured for orthogonally or obliquely projecting a signal output from the baseband receiver onto a subspace that is orthogonal or oblique to a subspace of the estimated received interference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An interference cancellation system configurable to operate in a multi-mode receiver, comprising:
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a means for performing decomposition of a communication channel into a plurality of subchannels; a means for performing baseband processing, comprising a means for performing upstream baseband processing and a means for performing downstream baseband processing; and a means for canceling interference; wherein at least one of the means for performing decomposition, the means for performing baseband processing, and the means for canceling interference is configurable for processing multi-mode signals; a means for selecting subchannels that are likely to contribute interference to at least one signal of interest, for producing at least one selected interference symbol; a means for synthesizing a synthesized interference signal from the at least one selected interference symbol; a means for performing channel emulation to produce an estimated interference signal from the synthesized interference signal; a second means for performing upstream baseband processing to produce an estimated received interference signal from the estimated interference signal; and a means for orthogonally or obliquely projecting a signal output from the means for performing baseband processing onto an interference subspace of the estimated received interference signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A handset, comprising:
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a channel decomposition module configured for performing a decomposition of a communication channel into a plurality of subchannels; a baseband receiver comprising an upstream baseband processor and a downstream baseband processor; and an interference canceller coupled between the upstream baseband processor and the downstream baseband processor; wherein at least one of the channel decomposition module, the baseband receiver, and the interference cancellation system is configurable for processing multi-mode signals; an interference selector coupled to the downstream baseband processor and configured for selecting subchannels that are likely to contribute interference to at least one signal of interest, for producing at least one selected interference symbol; a synthesizer configured to synthesize a synthesized interference signal from the at least one selected interference symbol; a channel emulator configured to produce an estimated interference signal from the synthesized interference signal; a second upstream baseband processor coupled to the channel emulator and configured for producing an estimated received interference signal from the estimated interference signal; and a canceller configured for orthogonally or obliquely projecting a signal output from the baseband receiver onto a subspace that is orthogonal or oblique to a subspace of the estimated received interference signal. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. A chipset, comprising:
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a channel decomposition module configured for performing a decomposition of a communication channel into a plurality of subchannels; a baseband receiver comprising an upstream baseband processor and a downstream baseband processor; and an interference canceller coupled between the upstream baseband processor and the downstream baseband processor; wherein at least one of the channel decomposition module, the baseband receiver, and the interference cancellation system is configurable for processing multi-mode signals; an interference selector coupled to the downstream baseband processor and configured for selecting subchannels that are likely to contribute interference to at least one signal of interest, for producing at least one selected interference symbol; a synthesizer configured to synthesize a synthesized interference signal from the at least one selected interference symbol; a channel emulator configured to produce an estimated interference signal from the synthesized interference signal; a second upstream baseband processor coupled to the channel emulator and configured for producing an estimated received interference signal from the estimated interference signal; and a canceller configured for orthogonally or obliquely projecting a signal output from the baseband receiver onto a subspace that is orthogonal or oblique to a subspace of the estimated received interference signal. - View Dependent Claims (53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68)
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Specification