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US 2004/0170233 A1Published application
Symbol normalization in MIMO systems
OwnerEko N. Onggosanusi, Srinath Hosur +1inventors
InventorsEko N. Onggosanusi, Srinath Hosur, Anand G. Dabak
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Abstract
A normalization for soft symbol estimates as reciprocal of the squared channel norm corresponding to each symbol.
Claims14
A method of decoding, comprising:
- (a) receiving through a transmission channel a signal encoding symbols s1, s2, . . . , sp where P is an integer greater than 1;
- (b) finding estimates z1, z2, . . . , zp for said symbols s1, s2, . . . , sp, respectively, by detection using estimates of said communication channel;
- (c) normalizing said estimates z1, z2, . . . , zp with factors γ1, γ2, . . . , γp, respectively, where γk depends upon an estimate of only the portion of said communications channel from a source of said symbol sk;
- and
- (d) decoding said received signal using the results of step (c).
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A receiver, comprising:
- (a) baseband sampler coupled to a transmission channel;
- (b) a transmission channel estimator coupled to the output of said baseband sampler;
- (c) a symbol detector coupled to said baseband sampler and to said transmission channel estimator, said detector with P symbol estimates z1, z2, . . . , zp output for a set of Q inputs from said baseband sampler where P and Q are integers greater than 1;
- (d) a decoder with input coupled to said output of said symbol detector;
- and
- (e) a symbol normalizer with input coupled to said transmission channel estimator and output coupled to said decoder with normalizations γ1, γ2, . . . , γp output corresponding to output symbol estimates z1, z2, . . . , zp, respectively, and where an output γk from said normalizer corresponding to a symbol estimate zk from said detector depends upon an estimate of only the portion of said transmission channel from a source of a symbol estimated by said symbol estimate zk.
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Dependencies are inferred from the claim text.