Space-time transmit diversity
First Claim
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1. A method of transmitting, comprising:
- (a) encoding a first block of symbols {s1(k)} with space-time transmit diversity;
(b) encoding a second block of symbols {s2(k)} with space-time transmit diversity;
(c) simultaneously transmitting said encoded first block from step (a) and said encoded second block from step (b);
(d) wherein for an index n, the set of four symbols, s1(n), s1(n+1), s2(n), S2(n+1), are mapped into at least two different symbol constellations.
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Abstract
A linear transformation of parallel space-time transmit diversity encoded streams; also, asymmetrical symbol mapping of parallel streams. Separately or together, these improve error rate performance as well as system throughput. Preferred embodiments include CDMA wireless systems with multiple antennas.
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Citations
22 Claims
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1. A method of transmitting, comprising:
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(a) encoding a first block of symbols {s1(k)} with space-time transmit diversity; (b) encoding a second block of symbols {s2(k)} with space-time transmit diversity; (c) simultaneously transmitting said encoded first block from step (a) and said encoded second block from step (b); (d) wherein for an index n, the set of four symbols, s1(n), s1(n+1), s2(n), S2(n+1), are mapped into at least two different symbol constellations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of receiving, comprising:
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(a) treating received signals as P/2 parallel STTD encoded signals from P antennas, with P an even integer greater than 3; and (b) detecting using at least two differing constellations for symbols of said encoded signals. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A transmitter, comprising:
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(a) a serial-to-parallel converter; (b) first and second symbol mappers coupled to said serial-to-parallel converter, said first symbol mapper having a different symbol constellation from said second symbol mapper; (c) a first space-time transmit diversity encoder coupled to said first symbol mapper; (d) a second space-time transmit diversity encoder coupled to said second symbol mapper; and (e) transmit antennas couple to said encoders.
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22. A receiver, comprising:
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(a) a channel coefficient estimator; (b) a combiner for P/2 space-time encoded symbol streams with P an even integer greater than 3, said combiner coupled to said estimator; and (c) a detector coupled to said combiner, said detector adaptive to asymmetric symbol constellations for said P/2 symbol streams.
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Specification