Abstract

Thanks to their algebraic construction, the Algebraic Space-Time Codes (ASTC), called the golden codes, are full-rank, full-rate and have the non-vanishing determinant property. The purpose of this work is to study the effects of channel estimation in Multi-Input-Multi-Output (MIMO) ultra-wideband (UWB) Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) system using ASTC codes under unknown UWB channel conditions. Methods for channel estimation using pilot symbols have been implemented using comb-type pilot subcarrier arrangements. The Least Squares (LS) and the Linear Minimum Mean-Square-Error (LMMSE) approaches supported by linear and spline cubic interpolations have been treated. Finally, BER performances of MIMO ASTC MB-OFDM system, under several propagation conditions and for different channel estimation methods, have been evaluated. In order to highlight the effectiveness of the proposed code, it will be shown that ASTC code can provide significantly better error performance compared to the classical Alamouti code in MIMO MB-OFDM system for LMMSE channel estimation method, at the same data rate.

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