A low-complexity noncoherent iterative space-time demodulator

Author

Wei, Ruey-Yi ; Hsu, Yu-Wei ; Pan, Chih-Chong

Author_Institution

Dept. of Commun. Eng., Nat. Central Univ., Jhongli, Taiwan

Volume

57

Issue

10

fYear

2009

fDate

10/1/2009 12:00:00 AM

Firstpage

2895

Lastpage

2898

Abstract

Turbo coded unitary space-time modulation (USTM) can provide large coding gain as compared to uncoded USTM. Because the noncoherent space-time maximum a posteriori demodulator is very complicated, in this letter, we propose a new low-complexity noncoherent iterative space-time demodulator for the USTM constructed from pilot symbol-assisted modulation. The proposed demodulator utilizes both hard and soft decisions from the turbo decoder to simplify the computational task as well as produce reliable soft outputs. Several examples demonstrate that this demodulator has both low complexity and good error performance.

Keywords

computational complexity; demodulators; iterative methods; maximum likelihood estimation; modulation; turbo codes; low-complexity noncoherent iterative space-time demodulator; maximum a posteriori demodulator; pilot symbol-assisted modulation; turbo decoder; turbo-coded unitary space-time modulation; Bit error rate; Concatenated codes; Demodulation; Fading; Gain; Iterative decoding; Modulation coding; Parity check codes; Receiving antennas; Turbo codes; Space-time code; demodulator; turbo code; unitary space-time modulation;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2009.10.080056

Filename

5288488