On the benefits of pilot-aided MAP receivers over differential PSK

Linda M. Davis*, Iain B. Collings

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

Abstract

This paper considers new maximum a posteriori (MAP) receivers for phase-shift keyed (PSK) digital mobile communication systems. The focus is on the benefits of pilot-aided PSK over differential PSK (DPSK) when using these receivers in fast fading channel conditions. For fading channels, DPSK is typically employed in preference to PSK because it avoids the need for accurate channel tracking. However, for both the PSK and DPSK MAP receivers considered here, non-coherent quadrature analog front-ends are used, with channel estimation being performed digitally in conjunction with data estimation. Channel estimates are formed along each branch of an expanded MAP trellis. In the case of absolutely encoded PSK, phase ambiguity is resolved using pilot symbols. For the new MAP receivers, the choice between PSK and DPSK is no longer clear. This paper shows that pilot-aided PSK outperforms DPSK for these new receivers, despite the SNR penalty associated with pilot symbols. From a computational point of view however, the new MAP DPSK receiver developed in this paper is more efficient.

Original languageEnglish
Title of host publication1999 IEEE Wireless Communications and Networking Conference, WCNC
Place of PublicationPiscataway, N.J.
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1172-1176
Number of pages5
Volume3
ISBN (Electronic)0780356691
ISBN (Print)0780356683
DOIs
Publication statusPublished - 1999
Externally publishedYes
Event1st IEEE Annual Wireless Communications and Networking Conference, WCNC - 1999 - New Orleans, United States
Duration: 21 Sep 199924 Sep 1999

Other

Other1st IEEE Annual Wireless Communications and Networking Conference, WCNC - 1999
CountryUnited States
CityNew Orleans
Period21/09/9924/09/99

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