Unitary space-time codes from Alamouti's scheme with APSK signals

Aijun Song*, Genyuan Wang, Weifeng Su, Xiang Gen Xia

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Unitary space-time codes have been used in differential space-time modulation, when neither the transmitter nor the receiver of a multiple antenna system knows the channel state information in Rayleigh fading channels. Among the codes in literature, unitary orthogonal space-time codes, constructed from Alamouti's scheme, have the advantage of fast maximum likelihood (ML) decoding but they require signal constellations to be phase-shift keying (PSK). In this paper, unitary space-time codes are constructed from Alamouti's scheme with amplitude/phase-shift keying (APSK) constellations. We show that the unitary space-time codes from Alamouti's scheme with APSK signals have larger diversity products than those with PSK signals while the complexity of their ML decoding algorithm is comparable. Our newly proposed 4 b/s/Hz code has about 2 dB gain over the same rate code with PSK signals at bit-error rate (BER) of 10~3 with one receive antenna. We also propose a noncoherent scheme of rate 5 b/s/Hz, which has the same BER performance as the 4 b/s/Hz unitary orthogonal space-time code in DSTM while having comparable decoding complexity.

Original languageEnglish
Pages (from-to)2374-2384
Number of pages11
JournalIEEE Transactions on Wireless Communications
Volume3
Issue number6
DOIs
Publication statusPublished - Nov 2004
Externally publishedYes

Keywords

  • Alamouti's scheme
  • Amplitude/phase shift keying (APSK) signals
  • Differential space-time modulation (DSTM)
  • Fast maximum-likelihood (ML) decoding algorithm
  • Orthogonal space-time codes
  • Unitary space-time codes

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