Pilot-Aided Channel Estimation of ASTC UWB MB-OFDM system

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.

[1]  R. Bouallegue,et al.  Algebraic Space Time Code implementation in MIMO environment: Design criteria and performance , 2013, 2013 15th International Conference on Advanced Communications Technology (ICACT).

[2]  A. Lalitha,et al.  Survey on Channel Estimation of the Orthogonal Frequency Division Multiplexing , 2019 .

[3]  Alfred Mertins,et al.  Space-Time-Frequency Code implementation in MB-OFDM UWB communications: Design criteria and performance , 2009, IEEE Transactions on Wireless Communications.

[4]  Vincent Savaux,et al.  Minimum mean-square-error expression of LMMSE channel estimation in SISO OFDM systems , 2013 .

[5]  Desmond P. Taylor,et al.  A Statistical Model for Indoor Multipath Propagation , 2007 .

[6]  M. J. Gans,et al.  On Limits of Wireless Communications in a Fading Environment when Using Multiple Antennas , 1998, Wirel. Pers. Commun..

[7]  Tong Liang Fan,et al.  An Improved DFT-Based Channel Estimation Algorithm for OFDM System on Time-Varying Multipath Fading Channels , 2014, CIT 2014.

[8]  Zhi Zheng,et al.  Least squares channel estimation with noise suppression for OFDM systems , 2016 .

[9]  Emanuele Viterbo,et al.  The golden code: a 2×2 full-rate space-time code with nonvanishing determinants , 2004, IEEE Trans. Inf. Theory.

[10]  Siavash M. Alamouti,et al.  A simple transmit diversity technique for wireless communications , 1998, IEEE J. Sel. Areas Commun..

[11]  Ridha Bouallegue,et al.  Algebraic Space-Time Code implementation in MB-OFDM UWB communications , 2014, 2014 International Wireless Communications and Mobile Computing Conference (IWCMC).

[12]  V. Srinivasa Somayazulu,et al.  Ultrawideband radio design: the promise of high-speed, short-range wireless connectivity , 2004, Proceedings of the IEEE.