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As the demand of high quality service in next generation wireless communication systems, a high performance of data transmission requires an increase of spectrum efficiency and an improvement of error performance in wireless communication systems. In this paper, the authors propose a multi-user Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) system with cyclic delay diversity and block diagonalization procoding method to improve Bit Error Rate (BER) performance with Wireless Local Area Network (WLAN) channel model C and D for 802.11n WLAN system.
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