Iterative multi-stage detection technique for a diversity receiver having multiple antenna elements
First Claim
1. An apparatus for receiving a signal, comprising:
- K antenna elements, wherein the K antenna elements are arranged to receive one of a corresponding K replicas of the signal and thereby generate K received signal replicas;
a signal processing chain;
a first multiplexer configured to receive N of the K received signal replicas and generate a first set of N channel signals, wherein each of the N channel signals is spread according to a corresponding one of N orthogonal sequences and corresponds to one of the N received signal replicas;
a second multiplexer configured to receive M of the K received signal replicas and generate a second set of M channel signals, wherein each of the M channel signals is spread according to one of the N orthogonal sequences and corresponds to one of the M received signal replicas;
a summing portion coupled between the signal processing chain and the first and second multiplexers, wherein the summing portion is configured to combine the first set of N channel signals and the second set of M channel signals into a multiplexed signal and provide the multiplexed signal to the signal processing chain;
a downconversion module configured to downconvert, within the signal processing chain, the multiplexed signal to a baseband multiplexed signal; and
a signal recovery module coupled to the signal processing chain, wherein the signal recovery module is configured to receive the baseband multiplexed signal and provide K separate signals from the baseband multiplexed signal, wherein each of the K separate signals corresponds to one of the K replicas of the signal.
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Abstract
An iterative multistage detection system and method for orthogonally multiplexing K channels onto a signal processing chain using N orthogonal sequences of length N. The K channels include a first set of N channels and a second set of M channels (the M channels being separate and distinct from the N channels), where K=N+M. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. In a second iteration, interference from the second set of M channels imparted on the first set of N channels is removed from the first set of N channels, thereby enabling the symbol values associated with the first set of N channels to be reliably estimated.
122 Citations
30 Claims
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1. An apparatus for receiving a signal, comprising:
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K antenna elements, wherein the K antenna elements are arranged to receive one of a corresponding K replicas of the signal and thereby generate K received signal replicas; a signal processing chain; a first multiplexer configured to receive N of the K received signal replicas and generate a first set of N channel signals, wherein each of the N channel signals is spread according to a corresponding one of N orthogonal sequences and corresponds to one of the N received signal replicas; a second multiplexer configured to receive M of the K received signal replicas and generate a second set of M channel signals, wherein each of the M channel signals is spread according to one of the N orthogonal sequences and corresponds to one of the M received signal replicas; a summing portion coupled between the signal processing chain and the first and second multiplexers, wherein the summing portion is configured to combine the first set of N channel signals and the second set of M channel signals into a multiplexed signal and provide the multiplexed signal to the signal processing chain; a downconversion module configured to downconvert, within the signal processing chain, the multiplexed signal to a baseband multiplexed signal; and a signal recovery module coupled to the signal processing chain, wherein the signal recovery module is configured to receive the baseband multiplexed signal and provide K separate signals from the baseband multiplexed signal, wherein each of the K separate signals corresponds to one of the K replicas of the signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for receiving a signal using K antenna elements, the system comprising:
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at least one processor that receives, via the K antenna elements, one of a corresponding K replicas of the signal and thereby generating K received signal replicas; said at least one processor receives N of the K received signal replicas and generating of a first set of N channel signals, wherein each of the N channel signals is spread according to a corresponding one of N orthogonal sequences and corresponds to one of the N received signal replicas; said at least one processor receives M of the K received signal replicas and generates a second set of M channel signals, wherein each of the M channel signals is spread according to one of the N orthogonal sequences and corresponds to one of the M received signal replicas; said at least one processor combines the first set of N channel signals and the second set of M channel signals into a multiplexed signal, and provides the multiplexed signal to the signal processing chain; said at least one processor downconverts the multiplexed signal to a baseband multiplexed signal; and said at least one processor receives the baseband multiplexed signal and providing of K separate signals from the baseband multiplexed signal, wherein each of the K separate signals corresponds to one of the K replicas of the signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for receiving a signal using K antenna elements, the system comprising:
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one or more circuits that receives, via the K antenna elements, one of a corresponding K replicas of the signal and thereby generating K received signal replicas; said one or more circuits receives N of the K received signal replicas and generates a first set of N channel signals, wherein each of the N channel signals is spread according to a corresponding one of N orthogonal sequences and corresponds to one of the N received signal replicas; said one or more circuits receives M of the K received signal replicas and generating of a second set of M channel signals, wherein each of the M channel signals is spread according to one of the N orthogonal sequences and corresponds to one of the M received signal replicas; said one or more circuits combines the first set of N channel signals and the second set of M channel signals into a multiplexed signal, and provides the multiplexed signal to the signal processing chain; said one or more circuits downconverts the multiplexed signal to a baseband multiplexed signal; and said one or more circuits receives the baseband multiplexed signal and provides K separate signals from the baseband multiplexed signal, wherein each of the K separate signals corresponds to one of the K replicas of the signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification