Differential modulation diversity

Author

Schober, Robert ; Lampe, Lutz H J

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of British Columbia, Vancouver, BC, Canada

Volume

51

Issue

6

fYear

2002

fDate

11/1/2002 12:00:00 AM

Firstpage

1431

Lastpage

1444

Abstract

In this paper, differential modulation diversity (DMD) is introduced. This diversity scheme is based on diagonal signal constellations which have been previously proposed for differential space-time modulation (DSTM). DMD can exploit both space and time diversity and DSTM, which is a pure space-diversity scheme, results as a special case. Low-complexity noncoherent receivers originally designed for DSTM are adapted to DMD and the power efficiency of DMD for Ricean fading with spatial correlation and imperfect interleaving is investigated. Based on analytical expressions for the pairwise error probability it is shown that space diversity increases the effective fading bandwidth, which has a negative influence on performance. Time diversity does not have this disadvantage and is preferable especially for fast fading channels. If space and time diversity are combined, a robust receiver results that yields high performance for a wide range of fading velocities.

Keywords

Rician channels; antenna arrays; diversity reception; error statistics; modulation; radio receivers; DMD; Ricean fading; diagonal signal constellations; differential modulation diversity; effective fading bandwidth; interleaving; noncoherent receivers; pairwise error probability; space diversity; spatial correlation; time diversity; Bandwidth; Block codes; Constellation diagram; Fading; Interleaved codes; Multidimensional systems; Pairwise error probability; Performance analysis; Robustness; Transmitting antennas;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/TVT.2002.804859

Filename

1175198