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| A Novel Distributed VBLAST Adaptive DFE Algorithm in Cooperative MIMO |
| Xu Xiao-rong,Zheng Bao-yu,Cui Jing-wu,Xie Pei-zhong |
| Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China |
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Abstract The significant problem for the implementation of distributed space-time encoding and decoding in multi-user cooperative MIMO is the adaptive space-time equalization algorithm with low detection complexity and fast convergence property. Space-time Decision Feedback Equalization (DFE) at multi-antenna receiver in Distributed Vertical Bell Labs Layered Space-Time (D-VBLAST) system is studied. RLS-MIMO-DFE detection algorithm based on Least Square (LS) criterion is proposed. Compared with other D-VBLAST detection algorithms such as Maximum Likelihood (ML)、Zero Forcing Ordered Successive Interference Cancellation (ZF-OSIC), the proposed algorithm has the unique property such as the fast convergence and the lower detection complexity. Theoretical derivation and simulated results show that, in D-VBLAST 2×2 system, although the performance of RLS-MIMO-DFE is a bit inferior to ML detection, the proposed algorithm could compromise the detection performance and computation complexity efficiently, and adapt to channel variation simultaneously. Thus it could satisfy real-time requirements for cooperative nodes in downlink channel.
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Received: 21 January 2009
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Corresponding Authors:
Xu Xiao-rong
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2010, Vol. 32 
