Orthogonal multi-carrier DS-CDMA with frequency-domain equalization

Ken Tanaka, Hiromichi Tomeba, Fumiyuki Adachi

Research output: Contribution to journalArticlepeer-review


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 frequencydomain 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.

Original languageEnglish
Pages (from-to)1055-1062
Number of pages8
JournalIEICE Transactions on Communications
Issue number4
Publication statusPublished - 2008


  • Frequency diversity gain
  • Frequency-domain equalization
  • Orthogonal MC DS-CDMA


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