ITERATIVE QR DECOMPOSTION CHANNEL ESTIMATION FOR MIMO-OFDM SYSTEMS

R. Prakash Kumar, I Raghu, M. Vinod Kumar Reddy

Abstract: Channel estimation algorithms have a key role in signal detection in MIMO-OFDM systems. In this system, the number of channel components which need to be estimated is much more than conventional SISO wireless systems. Consequently, the computational process of channel estimation is highly intensive. In addition, the high performance channel estimation algorithms mostly suffer from high computational complexity. In the other words, the system undergoes intensive computations if high performance efficiency is desired. However, there is an alternative solution to achieve both high performance efficiency and relatively low level of computational complexity. In this solution, high efficient channel estimation is firstly designed, and then it is simplified using alternative mathematical expressions. In this paper, Iterative channel estimation based on QR decomposition for MIMO-OFDM systems is proposed. From simulation results, the iterative QRD channel estimation algorithm can provide better mean-square-error and bit error rate performance than conventional methods.

Keywords: MIMO, OFDM, QRD,Least squre Channel estimation

DOI: https://doi.org/10.15623/ijret.2013.0208008