tailieunhanh - Báo cáo hóa học: " Research Article A Forward-Backward Kalman Filter-based STBC MIMO OFDM Receiver"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article A Forward-Backward Kalman Filter-based STBC MIMO OFDM Receiver | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 158037 14 pages doi 2008 158037 Research Article A Forward-Backward Kalman Filter-based STBC MIMO OFDM Receiver T. Y. Al-Naffouri and A. A. Quadeer Electrical Engineering Department King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia Correspondence should be addressed to A. A. Quadeer aquadeer@ Received 5 May 2008 Accepted 11 December 2008 Recommended by Kostas Berberidis Orthogonal frequency division multiplexing OFDM has emerged as a modulation scheme that can achieve high data rates over frequency selective fading channel by efficiently handling multipath effects. This paper proposes receiver design for spacetime block coded MIMO OFDM transmission over frequency selective time-variant channels. Joint channel and data recovery are performed at the receiver by utilizing the expectation-maximization EM algorithm. It makes collective use of the data constraints pilots cyclic prefix the finite alphabet constraint and space-time block coding and channel constraints finite delay spread frequency and time correlation and transmit and receive correlation to implement an effective receiver. The channel estimation part of the receiver boils down to an EM-based forward-backward Kalman filter. A forward-only Kalman filter is also proposed to avoid the latency involved in estimation. Simulation results show that the proposed receiver outperforms other least-squares-based iterative receivers. Copyright 2008 T. Y. Al-Naffouri and A. A. Quadeer. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Orthogonal frequency division multiplexing OFDM is a technique that enables high speed transmission over frequency selective channels with simple equalizers. It does this