Abstract

The design and analysis of differential spacetime coding is considered where the receiver, with a single radio frequency (RF) chain, uses switch and stay combining (SSC). Without channel knowledge at the receiver, a receive-power-based switching algorithm is proposed. By deriving the distribution of the received signal on the selected antenna, upper and lower bounds on the Chernoff bound on the pairwise error probability are derived. Using the upper bound, it is shown that even when the code satisfies the conditions to achieve full transmit diversity, if a fixed switching threshold with respect to the average SNR is used, receive diversity will not be attained. Following this, a switching threshold that offers full diversity is obtained and shown to be a logarithmic function of the average SNR at a high SNR. Furthermore, code design criteria for the proposed system are developed. For the special case of two transmit antennas, new codes for the proposed differentially modulated SSC scheme are designed and shown to perform better than existing codes. Simulation results are included to corroborate our analytical results.

Original languageEnglish (US)
Article number5471231
Pages (from-to)3373-3382
Number of pages10
JournalIEEE Transactions on Vehicular Technology
Volume59
Issue number7
DOIs
StatePublished - Sep 1 2010

Keywords

  • Chernoff bound
  • differential spacetime modulation
  • multiple inputmultiple output (MIMO)
  • switch and stay combining (SSC)

ASJC Scopus subject areas

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

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