Comparison of soft-decision decoding metrics in a QAM system with phase and amplitude errors

Author

Ellis, Jason D. ; Pursley, Michael B.

Author_Institution

Clemson Univ., Clemson, SC, USA

fYear

2009

fDate

18-21 Oct. 2009

Firstpage

1

Lastpage

7

Abstract

Demodulation of M-ary quadrature amplitude modulation (M-QAM) requires the receiver to estimate the phase and amplitude of the received signal. The demodulator performance is sensitive to errors in these estimates, and the sensitivity increases as M increases. We examine the effects of phase and amplitude errors on the performance of QAM communication systems with error-control coding and soft-decision decoding. Performance comparisons are given for 16-QAM and 64-QAM for two error-control coding techniques and two soft-decision decoding metrics.

Keywords

decoding; demodulation; error correction codes; modulation coding; quadrature amplitude modulation; M-ary quadrature amplitude modulation; amplitude errors; error-control coding; phase errors; soft-decision decoding; AWGN; Amplitude estimation; Amplitude shift keying; Constellation diagram; Correlators; Demodulation; Maximum likelihood decoding; Maximum likelihood estimation; Phase estimation; Quadrature amplitude modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Military Communications Conference, 2009. MILCOM 2009. IEEE

Conference_Location

Boston, MA

Print_ISBN

978-1-4244-5238-5

Electronic_ISBN

978-1-4244-5239-2

Type

conf

DOI

10.1109/MILCOM.2009.5380120

Filename

5380120