tailieunhanh - Báo cáo hóa học: " Signal Reception for Space-Time Differentially Encoded Transmissions over FIR Rich Multipath Channels"

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: Signal Reception for Space-Time Differentially Encoded Transmissions over FIR Rich Multipath Channels | EURASIP Journal on Applied Signal Processing 2004 5 629-639 2004 Hindawi Publishing Corporation Signal Reception for Space-Time Differentially Encoded Transmissions over FIR Rich Multipath Channels Zhan Zhang Department of Electrical and Computer Engineering Dalhousie University 1360 Barrington Street . Box 1000 Halifax NS Canada B3J 2X4 Email zhangz@ Jacek Ilow Department of Electrical and Computer Engineering Dalhousie University 1360 Barrington Street . Box 1000 Halifax NS Canada B3J 2X4 Email j. ilow@ Received 1 January 2003 Revised 28 November 2003 With sophisticated signal and information processing algorithms air interfaces with space-time ST coding and multiple reception antennas substantially improve the reliability of wireless links. This paper proposes a new receiver algorithm for differential ST coded transmissions over the finite-impulse-response FIR rich multipath fading channels. The symbol detection introduced in this paper is a deterministic subspace-based approach in a multiple-input and multiple-output MIMO system framework. The receiver i operates in a blind fashion without estimating the channel or its inverse and ii is able to work with a small number of signal samples and hence can be applied in the quasistatic channels. The proposed scheme employs multiple antennas at both sides of the transceiver and exploits both the antenna diversity and the multiple constant modulus MCM characteristics of the signaling. The receiver is able to blindly mitigate the intersymbol interference ISI in a rich multipath propagation environment and this has been verified through the extensive Monte Carlo simulations. Keywords and phrases rich multipath channels space-time processing transmit diversity unitary group codes signal subspace constant modulus. 1. INTRODUCTION Space-time ST multiple-input multiple-output MIMO transmission and reception is now regarded as one of the most effective approaches for increasing channel capacity or system .