一种低复杂度LMMSE信道估计算法

doi:10.3969/j.issn.1001-2400.2012.02.005

Abstract

Abstract:

This paper presents a novel low complexity LMMSE channel estimation algrithom for the OFDM system to reduce computational complexity caused by matrix inverse operation in the MMSE estimator. Correlation bandwidth is used as a criterion to divide the large auto-correlation matrix into a number of sub-matrixs, including the non-overlap and overlap method. The diaglog sub-matrix blocks representing low-frequency important channel information in the channel autocorrelation matrix are preserved while the other sub-matrix blocks are ignored, thus reducing autocorrelation matrix inversion computational complexity. BER and MSE performance of the new algrithom is evaluated in the frequency selective flat fading channel with comparison to the LMMSE, SVD algorithm. Simulation results and complexity anaysis show that low complexity is obtained at the slight cost of performance degradation.

Key words: channel estimation, coherence bandwidth, LMMSE, SVD

CLC Number:

TN929.5

SHI Lei;GUO Baolong;LI Xiaoping;LV Liang. Novel low complexity LMMSE channel estimation algorithm[J].J4, 2012, 39(2): 24-28+50.

References

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Novel low complexity LMMSE channel estimation algorithm

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