tailieunhanh - Báo cáo hóa học: " Performance of Asynchronous MC-CDMA Systems with Maximal Ratio Combining in Frequency-Selective 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: Performance of Asynchronous MC-CDMA Systems with Maximal Ratio Combining in Frequency-Selective Fading Channels | EURASIP Journal on Applied Signal Processing 2004 10 1595-1603 2004 Hindawi Publishing Corporation Performance of Asynchronous MC-CDMA Systems with Maximal Ratio Combining in Frequency-Selective Fading Channels Keli Zhang School of Electrical and Electronic Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Email eklzhang@ Yong Liang Guan School of Electrical and Electronic Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Email eylguan@ Received 28 February 2003 Revised 29 August 2003 The bit error rate BER performance of the asynchronous uplink channel of multicarrier code division multiple access MC-CDMA systems with maximal ratio combining MRC is analyzed. The study takes into account the effects of channel path correlations in generalized frequency-selective fading channels. Closed-form BER expressions are developed for correlated Nakagami fading channels with arbitrary fading parameters. For channels with correlated Rician fading paths the BER formula developed is in one-dimensional integration form with finite integration limits which is also easy to evaluate. The accuracy of the derived BER formulas are verified by computer simulations. The derived BER formulas are also useful in terms of computing other system performance measures such as error floor and user capacity. Keywords and phrases MC-CDMA MRC asynchronous transmission correlations fading channels. 1. INTRODUCTION Multicarrier code division multiple access MC-CDMA is a technique that combines direct sequence DS CDMA with orthogonal frequency division multiplexing OFDM modulation. It is one of the candidate technologies considered for the 4th-generation wireless communication systems 1 . MC-CDMA transmits every data symbol on multiple narrowband subcarriers and utilizes cyclic prefix to absorb and remove intersymbol interference ISI arising from frequency-selective fading. As it is unlikely for all subcarriers to .

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