Rate-diversity tradeoff of space-time codes with fixed alphabet and optimal constructions for PSK modulation

Francis Lu*, P. Vijay Kumar

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review

77 Scopus citations

Abstract

In this correspondence, we show that for any (Q × M) space-time code S having a fixed, finite signal constellation, there is a tradeoff between the transmission rate R and the transmit diversity gain v achieved by the code. The tradeoff is characterized by R ≤ Q - v + 1, where Q is the number of transmit antennas. When either binary phase-shift keying (BPSK) or quaternary phase-shift keying (QPSK) is used as the signal constellation, a systematic construction is presented to achieve the maximum possible rate for every possible value of transmit diversity gain.

Original languageEnglish
Pages (from-to)2747-2751
Number of pages5
JournalIEEE Transactions on Information Theory
Volume49
Issue number10
DOIs
StatePublished - 1 Oct 2003

Keywords

  • Rate-diversity tradeoff
  • Space-time codes

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