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| Asynchronous Multi-carrier Layered Space-time Code for Ricean Channel |
| Liu Tian Mo Tao-fu Wen Rong Tang You-xi |
| National Key Lab of Communication, University of Electronic Science and Technology of China, Chengdu 611731, China |
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Abstract The presence of the Line-Of-Sight (LOS) component will increase the condition number of the multi antenna channel matrix, and severely reduce detection performance of the synchronous multi-carrier layered space-time code. As a remedy to this problem, a multi-carrier layered space-time architecture is proposed based on the asynchronous transmission of each antenna’s signal in frequency domain. Closed-form Bit Error Rate (BER) expressions of the Zero Forcing (ZF) joint detection for a Ricean fading channel is derived for both coded and uncoded modulation. Comparisons are also made with those obtained in a traditional synchronous system. The theoretical analysis and simulation results show that the asynchronous multi-carrier transmission scheme can break through the antenna number limitation of synchronous multi-carrier layered space-time code system, while achieving full receive diversity with low complexity linear detector.
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Received: 29 June 2011
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Corresponding Authors:
Mo Tao-fu
E-mail: motaofu@uestc.edu.cn
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2012, Vol. 34 
