Postdetection diversity reception of QDPSK signals under frequency selective Rayleigh fading

Koji Ohno, Fumiyuki Adachi

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


Bit error rate (BER) performance improvements achieved by the use of postdetection diversity with selection combining for Nyquist raised cosine filtered quadrature differential phase shift keying (QDPSK) signal transmissions in frequency-selective Rayleigh fading channels are investigated. Theoretical analysis shows that diversity reception can significantly increase the maximum bit rate. If an average BER of 10-4 is required, a five-fold increase in the tolerable normalized rms delay spread (rms delay spread X symbol rate) is possible by using simple two-branch diversity reception. The effects the Nyquist filter roll-off factor have on average BER are also analyzed to show that average BER can be reduced at the cost of a slightly increased bandwidth. Laboratory and field experimental results that support these theoretical results are shown.

Original languageEnglish
Pages (from-to)431-436
Number of pages6
JournalIEEE Vehicular Technology Conference
Publication statusPublished - 1990 Dec 1
Externally publishedYes
EventFortieth IEEE Vehicular Technology Conference - Orlando, FL, USA
Duration: 1990 May 61990 May 9

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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