A general scheme for equalization of space-time block-coded systems with unknown CSI

Zhiguo Ding, Darren B. Ward, Woon Hau Chin

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Recently, space-time block codes (STBCs) have gained much attention as an effective transmit diversity technique to increase the capacity of wireless communication systems. In this paper, we consider a general technique for direct equalization of space-time block-coding systems with unknown channel state information (CSI). This technique is suitable for several existing hybrid STBC schemes, such as STBC/ orthogonal-frequency-division multiplexing (STBC-OFDM) and STBC/ code-division multiple access (STBC-CDMA). We show that by exploiting the redundancy in the structure of STBC, a zero-forcing equalizer can be constructed without channel estimation. The conditions for the identifiability of the zero-forcing equalizer are also derived to ensure correct equalization. To further improve the performance of the proposed method, a new iterative algorithm is developed by incorporating the finite alphabet property of information symbols. Simulation results show that the proposed algorithms can outperform comparative schemes in most simulation conditions.

Original languageBritish English
Pages (from-to)2737-2746
Number of pages10
JournalIEEE Transactions on Signal Processing
Issue number7
StatePublished - Jul 2006


  • Code-division multiple access (CDMA)
  • Identifiability
  • Orthogonal-frequency-division multiplexing (OFDM)
  • Semiblind direct equalization
  • Space-time block coding


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