Two-dimensional block-spread CDMA relay using virtual-four-antenna STCDTD

Qi Yue Yu, Wei Xiao Meng, Fumiyuki Adachi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Cooperative communication networks can exploit the spatial diversity inherent in a multiuser system by allowing users to cooperate and relay other users' messages to a destination. Avoiding the multiple-access interference (MAI) while taking full advantage of the multiuser cooperative multiple-input-multiple-output (Co-MIMO) is still an interesting problem. In this paper, we propose a relay scheme that combines the source user's two antennas and the relay user's two antennas to form a virtual-four-antenna space-time cyclic delay transmit diversity (STCDTD), and explore 2-D block-spread code-division multiple access (CDMA) to achieve MAI-free uplink transmission. The theoretical error probability of the proposed scheme is described, when a signal is transmitted through a multiple-access Rayleigh fading channel. Computer simulations indicate that the proposed scheme is able to avoid the MAI over a slow fading channel and to improve the bit error rate (BER) significantly.

Original languageEnglish
Article number6471284
Pages (from-to)3813-3827
Number of pages15
JournalIEEE Transactions on Vehicular Technology
Issue number8
Publication statusPublished - 2013
Externally publishedYes


  • 2-D block-spread code-division multiple access (CDMA).
  • Cooperative communications
  • Multiple-input-multiple-output
  • Space-time cyclic delay transmit diversity (STCDTD)

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics


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