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| A Method of Reducing the Complexity of Sphere Decoder in the High-Condition Number Channel |
| Zhao Hui; Long Hang; Wang Wen-bo |
| Key Lab of Universal Wireless Communications. Ministry of Education, BUPT, Beijing 100876, China |
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Abstract For MIMO system, as an efficient algorithm to replace ML detection, Sphere Decoding (SD) can reduce the detection complexity greatly. Whereas the bad channel with large condition number still aggravates the computation complexity of SD. In this paper, the reason of this phenomenon is firstly analyzed. Secondly, an algorithm of combining weight at high layer is proposed for SD, aiming to reduce the probability of accessing into the high layer of the tree in the searching process of SD so as to decrease the complexity. The simulation results prove that the proposed algorithm can cut down the complexity distinctly, even to more than 20% at low SNR and high condition number.
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Received: 10 December 2007
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2009, Vol. 31 
