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: System Performance of Concatenated STBC and Block Turbo Codes in Dispersive Fading Channels | EURASIP Journal on Applied Signal Processing 2005 6 844-851 2005 Hindawi Publishing Corporation System Performance of Concatenated STBC and Block Turbo Codes in Dispersive Fading Channels Yinggang Du Department of Electronic Engineering The Chinese University of Hong Kong Shatin NT Hong Kong Email ygdu@ Department of Electronic Engineering Nanjing University of Science Technology Nanjing Jiangsu 210094 China Kam Tai Chan Department of Electronic Engineering The Chinese University of Hong Kong Shatin NT Hong Kong Email ktchan@ Received 30 September 2003 Revised 15 July 2004 A new scheme of concatenating the block turbo code BTC with the space-time block code STBC for an OFDM system in dispersive fading channels is investigated in this paper. The good error correcting capability of BTC and the large diversity gain characteristics of STBC can be achieved simultaneously. The resulting receiver outperforms the iterative convolutional Turbo receiver with maximum a posteriori probability expectation-maximization MAP-EM algorithm. Because of its ability to perform the encoding and decoding processes in parallel the proposed system is easy to implement in real time. Keywords and phrases block turbo code space-time block code concatenation OFDM convolutional turbo code. 1. INTRODUCTION In wireless communications frequency-selective fading in unknown dispersive channels is a dominant problem in high data rate transmission. The resulting multipath effects reduce the received power and cause intersymbol interference ISI . Orthogonal frequency division multiplexing OFDM is often applied to combat this problem 1 . OFDM is a special case of multicarrier transmission where a single data stream is distributed and transmitted over a number of lower transmission rate subcarriers. Therefore OFDM in effect slices a broadband frequency-selective fading channel into a set of parallel narrowband flat-fading channels. In a flat-fading channel the extra transmit .
