Orthogonal space-time spreading transmit diversity

Shinsuke Takaoka, Fumiyuki Adachi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


In this paper, a new 2-antenna transmit diversity, called orthogonal space-time spreading transmit diversity (OSTSTD) combined with delay transmission, is proposed. At the transmitter, N data symbols to be transmitted are spread using N different orthogonal space-time spreading codes (each represented by N × N matrix) and are transmitted from two transmit antennas after adding different time delays. At the receiver, 2-step space-time despreading is carried out to recover the N transmitted data symbols. The first step recovers the N orthogonal spatial channels by taking the correlation between the received space-time spread signal and the time-domain spreading codes. The second step recovers the N transmitted data symbols using minimum mean square error (MMSE) despreading. The average bit error rate (BER) performance in a Rayleigh fading channel is evaluated by computer simulation. It is confirmed that the OSTSTD provides better BER performance than the Alamouti's space-time transmit diversity (STTD) at the cost of transmission time delay.

Original languageEnglish
Pages (from-to)2120-2127
Number of pages8
JournalIEICE Transactions on Communications
Issue number5
Publication statusPublished - 2005


  • Fading channel
  • Space-time spreading
  • Transmit diversity


Dive into the research topics of 'Orthogonal space-time spreading transmit diversity'. Together they form a unique fingerprint.

Cite this