University of Hertfordshire

MIMO-OFDM with pilot-aided channel estimation for WiMax systems

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Original languageEnglish
Title of host publication2010 IEEE 6th International Conference on Wireless and Mobile Computing, Networking and Communications, WiMob'2010 Art. No. 5645005
PublisherIEEE
Pages586-590
ISBN (Print)978-1-4244-7743-2
DOIs
Publication statusPublished - 2010

Abstract

This paper describes a channel estimation scheme for Multiple Input Multiple Output (MIMO)-Orthogonal Frequency Division Multiplexing (OFDM) systems based on training sequence. We first develop an approach to channel estimation which is crucial for the decoding of the transmitted data. We then discuss the implementation of the proposed method for WiMax systems under various channel conditions. The efficiency of the new algorithm is demonstrated through the simulation of the MIMO-OFDM system for two and four transmit antennas and different number of receive antennas. The Space-Time Coding with 192 information subcarriers per codeword is used as defined in the WiMax standard. Through simulations, it is shown that the proposed method has between 1.5 dB and 2dB loss compared to the ideal case where the channel coefficients are known at the receiver. In summary, with the proposed channel estimation technique, combining diversity using Space-Time Codes with OFDM is proved to be a promising technique for the present and future wireless communications.

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