tailieunhanh - Báo cáo hóa học: " BER Performance for Downlink MC-CDMA Systems over Rician Fading 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: BER Performance for Downlink MC-CDMA Systems over Rician Fading Channels | EURASIP Journal on Applied Signal Processing 2005 5 709-717 2005 Hindawi Publishing Corporation BER Performance for Downlink MC-CDMA Systems over Rician Fading Channels Zhihua Hou Positioning Wireless Technology Centre PWTC School of Electrical Electronic Engineering Nanyang Technological University 50 Nanyang Drive Singapore 637553 Email houzhihua@ Vimal K. Dubey School of Electrical Electronic Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Email evkdubey@ Received 30 July 2003 Revised 1 April 2004 We consider downlink multicarrier code-division multiple-access MC-CDMA systems using binary phase-shift keying BPSK modulation scheme and maximal ratio combining MRC in frequency-selective Rician fading channels. A time-domain method to obtain bit error rate BER by calculating moment generating function MGF of the decision variable for a tapped-delay-line channel model is proposed. This method does not require any assumption regarding the statistical or spectral distribution of multiple access interference MAI and it is also not necessary to assume that the fading encountered by the subcarriers is independent of each other. The analytical formula is also verified by simulations. Keywords and phrases frequency-selective Rician fading channels MC-CDMA moment generating function performance analysis BER for downlink MC-CDMA systems over Rician fading channels. 1. INTRODUCTION MC-CDMA systems based on the combination of code-division multiple-access CDMA and orthogonal frequency-division multiplexing OFDM techniques were proposed in 1993 1 . The multicarrier CDMA schemes can be categorized into two groups MC-CDMA and MC-DS-CDMA 2 . Due to the attractive features like efficient frequency diversity and high bandwidth efficiency 3 MC-CDMA has received greater attention. Furthermore MC-CDMA outperforms direct sequence CDMA DS-CDMA and MC-DS-CDMA in terms of BER performance over the downlink. Hence MC-CDMA appears to be

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