Soft estimate normalization for weighted multiantenna high-order modulation data channel together with separate antenna pilot channels using averaging in first time slots of a transmission time interval with corrections for subsequent time slots.
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What is claimed is: 1. A communication reception method, comprising: (a) receiving pilot and data signals transmitted from a plurality of antennas of a transmitter; (b) estimating a data channel from said transmitter for a first time slot of a transmission time interval using (i) said received pilo
What is claimed is: 1. A communication reception method, comprising: (a) receiving pilot and data signals transmitted from a plurality of antennas of a transmitter; (b) estimating a data channel from said transmitter for a first time slot of a transmission time interval using (i) said received pilot signals in said first time slot, (ii) estimates of weights of said antennas for said first time slot, and (iii) said received data signals in said first time slot; and (c) estimating said data channel for a second time slot of said transmission time interval using the results of step (b) together with (i) said received pilot signals in said second time slot and (ii) estimates of weights of said antennas for said second time slot. 2. The method of claim 1, wherein: (a) said estimating of step (b) of claim 1 uses averaging including squared magnitudes of said received data signals. 3. The method of claim 1, wherein: (a) said estimating of step (b) of claim 1 uses averaging including magnitudes of real and imaginary parts of said received data signals. 4. The method of claim 1, wherein: (a) said estimates of weights for said second time slot of step (c) of claim 1 derive from estimates of said weights for said first time slot together with information sent to said transmitter. 5. The method of claim 1, wherein: (a) said estimating of step (b) of claim 1 includes estimating noise variance of said data channel using said received pilot signals. 6. The method of claim 1, wherein: (a) said estimating of step (b) of claim 1 includes estimating noise variance of said data channel using said received data signals. 7. The method of claim 1, wherein: (a) one or more of the following receivers are used: RAKE receiver, multipath interference canceller, or equalizer. 8. A communication reception method comprising: (a) receiving pilot and data signals transmitted from a plurality of antennas of a transmitter; and (b) estimating a data channel from said transmitter using (i) said received pilot signals, (ii) estimates of weights of said antennas, and (iii) averages including squared magnitudes of said received data signals; (c) wherein said averages of step (b) are averages over sets of transmitted symbols and include averages of |y(m,k)|2 f(m,k)σ2)/f(m,k)2 E[|s(m,k)|2] where y(m,k) is a detection of transmitted data symbol s(m,k), f(m,k) is a squared magnitude of a pilot channel estimation including antenna weights, σ2 is a noise variance estimation, and F denotes expectation. 9. A communication reception method, comprising: (a) receiving pilot and data signals transmitted from a plurality of antennas of a transmitter; and (b) estimating a data channel from said transmitter using (i) said received pilot signals, (ii) estimates of weights of said antennas, and (iii) averages including magnitudes of real and imaginary parts of said received data signals; (c) wherein said averages of step (b) are averages over sets of transmitted symbols and include averages of (|Re{y(m,k)}|+|lm{y(m,k)}|)/2f(m,k)E[|Re{s(m,k)}|] where y(m,k) is a detection of transmitted data symbol s(m,k), f(m,k) is a squared magnitude of a pilot channel estimation including antenna weights, and F denotes expectation. 10. A communication reception method, comprising: (a) receiving pilot and data signals transmitted from a plurality of antennas of a transmitter; (b) estimating a data channel from said transmitter using (i) said received pilot signals for a first set of transmitted pilot symbols within a first time slot, (ii) estimates of weights of said antennas for said first time slot, and (iii) averages of said received data signals for a first set of transmitted data symbols; and (c) re-estimating said data channel using the results of step (b) together with said received pilot signals for a second set of transmitted pilot symbols within said first time slot. 11. The method of claim 10, wherein: (a) said averages of step (b) of claim 10 include averages of (|y(m,k)|2f(m,k)σ2)/f(m,k)2E[|s(m,k)| 2] where y(m,k) is a detection of transmitted data symbol s(m,k) of a first set of data symbols, f(m,k) is a squared magnitude of a pilot channel estimation including antenna weights and from said first set of pilot symbols, σ2 is a noise variance estimation, and F denotes expectation. 12. The method of claim 10, wherein: (a) said averages of step (b) of claim 10 include averages of (|Re{y(m,k)}|+|lm{y(m,k)}|)/2f(m,k)E[|Re{s(m,k)}|] where y(m,k) is a detection of transmitted data symbol s(m,k) of said first set of data symbols, f(m,k) is a squared magnitude of a pilot channel estimation including antenna weights and from said first set of pilot symbols, and E denotes expectation. 13. The method of claim 10, wherein: (a) one or more of the following receivers are used: RAKE receiver, multipath interference canceller, or equalizer.
Narayan, Anand P.; Olson, Eric S.; Jain, Prashant; Thomas, John K., Method and apparatus for interference suppression with efficient matrix inversion in a DS-CDMA system.
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