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| Revised Subspaceª²Based Decoding of Spaceª²Time
Block Codes over Spatially Correlated Channels Gong Zhengwei£¬Zhang Taiyi£¬Feng Zhenjie (School of Electronics and Information Engineering£¬Xi'an¡¡Jiaotong¡¡University£¬Xi'an 710049£¬China) Abstract£ºDue to the performance degradation of subspaceª²based blind decoding of
spaceª²time block codes (STBC) over spatially correlated channels£¬ a revised decoding
algorithm was proposed£® By analyzing that the channel correlation destroys the
orthogonality between the signal subspace and the statistical noise subspace£¬ the code
matrix set used for searching was revised by the new algorithm with the known correlation
matrix in the receiver£® The decoding performance was improved because the revised
subspace of sending signal would be orthogonal to the statistical noise subspace obtained
from decomposing the correlated channel£® Compared to the traditional decoding algorithms£¬
the proposed scheme is no need to estimate the correlation matrix of the channel and preª²code
at the transmitter£¬ and its coding complexity is reduced£® Monteª²Carlo simulations
demonstrate that subspaceª²based blind decoding of STBC degrades severely in the high
correlated channels,while the revised decoding performance is increased by about 2 dB when
BER is 10-2 and correlation coefficient is 0.8£® |
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