NDLI: Reducing signal distortion due to transmission error via multiresolution digital modulations

Content Provider	IEEE Xplore Digital Library
Author	Jing Lu Annamalai, A. Vaman, D.R.
Copyright Year	2008
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Prairie View A&M Univ., Prairie View, TX (Jing Lu; Annamalai, A.; Vaman, D.R.)
Abstract	Although the different bits in a pulse code modulation (PCM) word that represent the level of quantized analog samples require different degrees of error protection, this factor is rarely taken into account in traditional digital wireless communication system designs. Multiresolution modulation schemes that consist of nonuniformly spaced symbols allow for unequal error protection (UEP) of transmitted bits within a symbol according to their importance. In this article, we investigate the problem of matching asymmetrical phase shift keying (PSK) modulations with the multiresolution temporal waveform coding scheme to minimize the effect of transmission errors in 1-D and 2-D analog signals. We show that both the mean and the variance of signal distortion can be reduced considerably, especially when the channel condition deteriorates, by mapping the PCM bits to a suitable asymmetric PSK signal constellation such that the most significant bits have a lower probability of being in error than the least significant bits. This embedding gain can be translated into energy and/or spectral efficiency improvement over the baseline uniform PSK case for a specified distortion level.
Starting Page	360
Ending Page	369
File Size	513636
Page Count	10
File Format	PDF
ISBN	9781424418695
ISSN	19345070
DOI	10.1109/WTS.2008.4547589
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-04-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phase change materials Wireless communication Phase shift keying Digital modulation Energy resolution Distortion Error correction codes Pulse modulation Signal resolution Modulation coding
Content Type	Text
Resource Type	Article

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