tailieunhanh - Báo cáo hóa học: " Joint Impact of Frequency Synchronization Errors and Intermodulation Distortion on the Performance of Multicarrier DS-CDMA Systems"

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: Joint Impact of Frequency Synchronization Errors and Intermodulation Distortion on the Performance of Multicarrier DS-CDMA Systems | EURASIP Journal on Applied Signal Processing 2005 5 730-742 2005 Hindawi Publishing Corporation Joint Impact of Frequency Synchronization Errors and Intermodulation Distortion on the Performance of Multicarrier DS-CDMA Systems Luca Rugini Dipartimento di Ingegneria Elettronica e dell Informazione DIEI Universita degli Studi di Perugia Via G. Duranti 93 06125 Perugia Italy Email rugini@ Paolo Banelli Dipartimento di Ingegneria Elettronica e dell Informazione DIEI Universita degli Studi di Perugia Via G. Duranti 93 06125 Perugia Italy Email banelli@ Received 5 August 2003 Revised 19 January 2004 The performance of multicarrier systems is highly impaired by intercarrier interference ICI due to frequency synchronization errors at the receiver and by intermodulation distortion IMD introduced by a nonlinear amplifier NLA at the transmitter. In this paper we evaluate the bit-error rate BER of multicarrier direct-sequence code-division multiple-access MC-DS-CDMA downlink systems subject to these impairments in frequency-selective Rayleigh fading channels assuming quadrature amplitude modulation QAM . The analytical findings allow to establish the sensitivity of MC-DS-CDMA systems to carrier frequency offset CFO and NLA distortions to identify the maximum CFO that is tolerable at the receiver side in different scenarios and to find out the optimum value of the NLA output power backoff for a given CFO. Simulation results show that the approximated analysis is quite accurate in several conditions. Keywords and phrases multicarrier DS-CDMA carrier frequency offset intermodulation distortion Rayleigh fading. 1. INTRODUCTION In the last years several multicarrier code-division multipleaccess MC-CDMA schemes 1 have been proposed by combining orthogonal frequency-division multiplexing OFDM and direct-sequence code-division multiple-access DS-CDMA with the goal of incorporating the advantages of both techniques. Specifically the low-complexity equalization

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