Highly Efficient Sparse Multipath Channel Estimator with Chu-Sequence Preamble for Frequency-Domain MIMO DFE Receiver

Jeng-Kuang HWANG
Rih-Lung CHUNG
Meng-Fu TSAI
Juinn-Horng DENG

IEICE TRANSACTIONS on Communications   Vol.E90-B    No.8    pp.2103-2110
Publication Date: 2007/08/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.8.2103
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
sparse multipath channel,  channel estimation,  GAIC,  least squares,  MIMO FD-DFE,  

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In this paper, a sparse multipath channel estimation algorithm is proposed for multiple-input multiple-output (MIMO) single-carrier systems with frequency-domain decision feedback equalizer (FD-DFE). This algorithm exploits the orthogonality of an optimal MIMO preamble based on repeated, phase-rotated, Chu (RPC) sequences, leading to a dramatic reduction in computation. Furthermore, the proposed algorithm employs an improved non-iterative procedure utilizing the Generalized AIC criterion (GAIC), resulting in further computational saving and performance improvement. The proposed scheme is simulated for 802.16d SCa-PHY and SUI-5 sparse channel model under a 22 spatial multiplexing scenario, with the MIMO FD-DFE as the receiver. The result shows that the channel estimation accuracy is significantly improved, and the performance loss compared to the known channel case is only 0.7 dB at the BER of 10-3.