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Look-Ahead Sphere Decoding: Algorithm and performance evaluation

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2 Author(s)
Gamba, M.T. ; Dipt. di Elettron., Politec. di Torino, Turin, Italy ; Masera, G.

Multiple input multiple output (MIMO) systems are recognized as a key enabling technology in high performance wireless communications. Among known MIMO detectors, the sphere decoding algorithm (SDA) is capable of optimal performance with a reduced computational complexity, compared to a maximum likelihood (ML) detector. However the hardware implementation of the SDA still is a major design challenge, especially with high throughput constraints. This paper proposed a modified version of the SDA, which achieves a significant throughput increase and guarantees ML performance, at the price of limited additional complexity. This new solution, called LASDA (Look-Ahead SDA) is mainly based on formal algorithm transformations, namely look-ahead, pipelining and retiming, applied at signal processing level. In addition, a modified tree search strategy, called test&restart, allows a limited increase of the iteration number. The analysis of the proposed LASDA shows that it is almost twice as fast as SDA, while simulation results exhibit ML performance.

Published in:

Wireless Communication Systems, 2009. ISWCS 2009. 6th International Symposium on

Date of Conference:

7-10 Sept. 2009