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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2007 E90-A(11):2361-2368; doi:10.1093/ietfec/e90-a.11.2361
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Copyright © 2007 The Institute of Electronics, Information and Communication Engineers

Special Section on Wideband Systems -- Papers -- CDMA

Doppler Diversity in MC-CDMA Systems with T-ZCZ Sequences for Doppler Spread Cancelation

Xiaoming TAO1, Chao ZHANG2 and Jianhua LU1

1 The authors are with the Dept. of Elec. Engr., Tsinghua University, Beijing, P.R.China. E-mail: taoxm03{at}mails.tsinghua.edu.cn, 2 The author is with the Faculty of School of Aerospace, Tsinghua University, Beijing, P.R.China.


  Abstract

Doppler diversity has been proven effective to combat time variation caused by Doppler spread in single carrier systems. However, it is not efficient to directly apply Doppler diversity into Multi-Carrier Code Division Multiple Access (MC-CDMA) systems because Inter-Carrier-Interference (ICI) increases with the artificial frequency shifts in diversity branches. In this paper, a novel Doppler diversity scheme in MC-CDMA with Three Zero Correlation Zones (T-ZCZ) sequences is proposed to further improve the performance of Doppler diversity. Particularly, zero correlation zones are employed in frequency domain for ICI cancelation caused by Doppler spread, which confirms the validity of the contribution to the wideband wireless communications in high speed mobile environment.

Key Words: Doppler diversity, MC-CDMA, T-ZCZ, Doppler spread

Manuscript received March 5, 2007. Manuscript revised June 2, 2007. Final manuscript received July 17, 2007.


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