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IEICE Transactions on Communications 2008 E91-B(4):1055-1062; doi:10.1093/ietcom/e91-b.4.1055
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Papers -- Wireless Communication Technologies

Orthogonal Multi-Carrier DS-CDMA with Frequency-Domain Equalization

Ken TANAKA1, Hiromichi TOMEBA1 and Fumiyuki ADACHI1

1 The authors are with the Department of Electrical and Com-munication Engineering, Graduate School of Engineering, Tohoku University, Sendai-shi, 980-8579 Japan. E-mail: tanaka{at}mobile.ecei.tohoku.ac.jp


  Abstract

Orthogonal multi-carrier direct sequence code division multiple access (orthogonal MC DS-CDMA) is a combination of orthogonal frequency division multiplexing (OFDM) and time-domain spreading, while multi-carrier code division multiple access (MC-CDMA) is a combination of OFDM and frequency-domain spreading. In MC-CDMA, a good bit error rate (BER) performance can be achieved by using frequency-domain equalization (FDE), since the frequency diversity gain is obtained. On the other hand, the conventional orthogonal MC DS-CDMA fails to achieve any frequency diversity gain. In this paper, we propose a new orthogonal MC DS-CDMA that can obtain the frequency diversity gain by applying FDE. The conditional BER analysis is presented. The theoretical average BER performance in a frequency-selective Rayleigh fading channel is evaluated by the Monte-Carlo numerical computation method using the derived conditional BER and is confirmed by computer simulation of the orthogonal MC DS-CDMA signal transmission.

Key Words: orthogonal MC DS-CDMA, frequency-domain equalization, frequency diversity gain

Manuscript received December 7, 2006. Manuscript revised August 26, 2007.


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