tailieunhanh - Báo cáo hóa học: "Research Article A Generalized Algorithm for Blind Channel Identification with Linear Redundant Precoders"

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 Generalized Algorithm for Blind Channel Identification with Linear Redundant Precoders | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 25672 13 pages doi 2007 25672 Research Article A Generalized Algorithm for Blind Channel Identification with Linear Redundant Precoders Borching Su and P. P Vaidyanathan Department of Electrical Engineering California Institute of Technology Pasadena CA 91125 USA Received 25 December 2005 Revised 19 April 2006 Accepted 11 June 2006 Recommended by See-May Phoong It is well known that redundant filter bank precoders can be used for blind identification as well as equalization of FIR channels. Several algorithms have been proposed in the literature exploiting trailing zeros in the transmitter. In this paper we propose a generalized algorithm of which the previous algorithms are special cases. By carefully choosing system parameters we can jointly optimize the system performance and computational complexity. Both time domain and frequency domain approaches of channel identification algorithms are proposed. Simulation results show that the proposed algorithm outperforms the previous ones when the parameters are optimally chosen especially in time-varying channel environments. A new concept of generalized signal richness for vector signals is introduced of which several properties are studied. Copyright 2007 B. Su and P. P. Vaidyanathan. 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 Wireless communication systems often suffer from a problem due to multipath fading which makes the channels frequency-selective. Channel coefficients are often unknown to the receiver so that channel identification needs to be done before equalization can be performed. Among techniques for identifying unknown channel coefficients blind methods have long been of great interest. In the literature many blind