Space-time transmit diversity
First Claim
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1. A method of transmitting, comprising:
- (a) applying symbol streams s1, s2, . . . , sP to a plurality of space-time transmit diversity encoders at a first time, where P is an integer greater than 3;
(b) encoding s1 to produce streams x1, x2;
(c) encoding stream sP to produce streams x2P-1x2P;
(d) linearly transforming said x1, x2, . . . x2p into y1, y2, . . . , y2P; and
(e) transmitting to a recipient said y1, y2, . . . , y2P,(f) wherein said linearly transforming of step (d) is a weighted permutation of said x1, x2 derived from transmission channel coefficients, and wherein said weighted permutation changes the order of symbols from streams x1, x2, . . . , x2P to streams y1, y2, . . . , y2P.
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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
19 Claims
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1. A method of transmitting, comprising:
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(a) applying symbol streams s1, s2, . . . , sP to a plurality of space-time transmit diversity encoders at a first time, where P is an integer greater than 3; (b) encoding s1 to produce streams x1, x2; (c) encoding stream sP to produce streams x2P-1x2P; (d) linearly transforming said x1, x2, . . . x2p into y1, y2, . . . , y2P; and (e) transmitting to a recipient said y1, y2, . . . , y2P, (f) wherein said linearly transforming of step (d) is a weighted permutation of said x1, x2 derived from transmission channel coefficients, and wherein said weighted permutation changes the order of symbols from streams x1, x2, . . . , x2P to streams y1, y2, . . . , y2P. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of transmitting, comprising:
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(a) providing symbol stream s1 to a first space-time transmit diversity encoder at a first time; (b) providing space-time transmit diversity encoded streams x1, x2 from said first space-time transmit diversity encoder; (c) providing symbol stream s2 to a second space-time transmit diversity encoder at the first time; (d) providing space-time transmit diversity encoded streams x3, x4 from said second space-time transmit diversity encoder, wherein said streams x3, x4 are different from said streams x1, x2; (e) linearly transforming said x1, x2, x3, x4 into y1, y2, y3, y4 by a permutation of said x1, x2, x3, x4 in response to channel coefficients, wherein said permutation changes the order of symbols from streams x1, x2, x3, x4 to streams y1, y2, y3, y4; and (f) transmitting said y1, y2, y3, y4. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification