NDLI: Performance Analysis of an Angle Differential-QAM Scheme for Resolving Phase Ambiguity

Content Provider	IEEE Xplore Digital Library
Author	Jeng-Kuang Hwang Yu-Lun Chiu
Copyright Year	2008
Description	Author affiliation: Commun. Signal Process. Lab. Inst. of Commun. Eng., Yuan-Ze Univ., Taipei (Jeng-Kuang Hwang; Yu-Lun Chiu)
Abstract	An angle differential-QAM (ADQAM) scheme is proposed to solve phase ambiguity problem in non-data-aided continuous transmission system with square QAM constellation. Starting from the 16-ADQAM case, we derive differential encoding and decoding schemes in terms of two differential angles, and use a solar system analogy for explanation. The 16-ADQAM system incurs only about 0.5-dB performance degradation as compared to the coherent 16-QAM system under AWGN channel. Generalization to flat fading channel and higher-level ADQAM are straightforward. For educational purpose, a demonstrative 16-ADQAM system is realized in terms of an audio-band software-defined-radio approach, and experimental result shows the feasibility of real-time speech transmission.
Starting Page	161
Ending Page	166
File Size	1192538
Page Count	6
File Format	PDF
ISBN	9788955191363
ISSN	17389445
DOI	10.1109/ICACT.2008.4493734
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-02-17
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	ETRI, NIA
Subject Keyword	Performance analysis Quadrature amplitude modulation Decoding Constellation diagram Solar system Degradation AWGN channels Fading Speech Quadrature phase shift keying performance analysis Differential coding scheme square QAM continuous transmission system phase ambiguity Rayleigh fading
Content Type	Text
Resource Type	Article

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