Abstract—This paper proposes reduced complexity QR decomposition with M-algorithm (QRM) maximum likelihood detection (MLD) by removing superfluous paths according to the maximum squared Euclidean distance. As a result of computer simulation, the proposed method can have 56% reduction of computational complexity compare with the conventional QRM-MLD without any performance degradation at 20dB SNR. Compare with MMSE method, the 3.0% BER of conventional method is reduced to 0.04% by proposed method.

Index Terms—Channel equalization, MIMO OFDM, MMSE, QRM-MLD.

The authors are with the Department of Electronic Engineering, Sogang University, C.P.P Box 1142, Seoul, Korea (e-mail : jiny4509@sogang.ac.kr,kyskim@sogang. ac.kr, wsockkh@sogang.ac.kr and ylkim@sogang.ac.kr)

Cite: Jinyong Lee, Youngseh Kim, Kanghoon Kim, and Younglok Kim, "Reduced Complexity QRM-MLD for MIMO System," International Journal of Computer and Electrical Engineering vol. 4, no. 3, pp. 384-386, 2012.