Performance Improvement of Ordered Successive Detection with Imperfect Channel Estimates for MIMO Systems


IEICE TRANSACTIONS on Communications   Vol.E86-B   No.11   pp.3200-3208
Publication Date: 2003/11/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technology
wireless,  MIMO,  V-BLAST,  ordered successive detection,  modified noise variance,  backward iterative detection,  

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Ordered successive MMSE detection (OSD) can achieve a good tradeoff between performance and complexity for multiple-input multiple-output (MIMO) wireless systems where different data streams are transmitted and received simultaneously over several equal number of transmit and receive antennas. However, over time-varying MIMO channels, the performance of OSD is degraded with realistic channel estimation. In this paper, we introduce two different approaches in order to improve the performance of OSD. First, we propose to improve the accuracy of the generated nulling weights by using a modified noise variance that takes into consideration the weights update lag error besides to the noise and channel estimation errors. Second, we introduce a new iteration approach in order to improve the decisions made by OSD on transmitted streams. The proposed iterative scheme, named as backward iterative detection, exploits the tentative decisions on lately detected streams in order to mainly improve the decision on the firstly detected stream that limits the overall performance. Simulation results of combining both approaches show significant performance improvements of OSD.