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A low complexity soft-input soft-output MIMO detector which combines a Sphere Decoder with a Hopfield network

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3 Author(s)
Louw, D.J. ; Dept. of Electr., Electron. & Comput. Eng., Univ. of Pretoria, Pretoria, South Africa ; Botha, P.R. ; Maharaj, B.T.

In this paper, a reduced complexity soft-input soft-output MIMO detector is presented. The detector combines a Sphere Decoder, a Hopfield neural network and an error correction code in an iterative structure (turbo). The simulation results demonstrate that with less computational complexity, the proposed system's performance equals that of a sphere decoder based max-log-map detector in ideal channel conditions. In correlated channel conditions, the system performs within 0.3 dB of the max-log-map detector at a reduced complexity. An adaptive extrinsic information scaling factor is also introduced to improve performance in non-ideal channel conditions.

Published in:

MELECON 2010 - 2010 15th IEEE Mediterranean Electrotechnical Conference

Date of Conference:

26-28 April 2010