Interference mitigation for asynchronous cooperative STBC-OFDM systems |
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Authors: | Lihua Pang Jiandong Li Yang Zhang |
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Affiliation: | State Key Laboratory of Integrated Service Networks, Information Science Institute,Xidan University, Xi'an 710071, China |
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Abstract: | This paper addresses the problem of interference mitigation in cooperative Space Time Block Coded Orthogonal Frequency Division Multiplexing (STBC-OFDM) systems in the presence of asynchronism. This scheme first preprocesses the received ST codewords to convert the equivalent fading matrix into a suboptimal ordering upper triangular form based on low complexity permutation QR decomposition, and then suppresses the InterCarrier Interference (ICI) and InterSymbol Interference (ISI) by exploiting Successive Interference Cancellation (SIC) technique. Simulation results show that the performance of the proposed algorithm slightly outmatches or asymptotically approaches to that of the existing Minimum Mean Square Error (MMSE) detector depending on the magnitude of the Carrier Frequency Offsets (CFOs) but with less complexity. |
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Keywords: | Asynchronism Cooperative communication Orthogonal Frequency Division Multiplexing (OFDM) QR decomposition Space Time Block Coding (STBC) |
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