DocumentCode :
898253
Title :
Trellis Shaping for Controlling Envelope of Single-Carrier High-Order QAM Signals
Author :
Tanahashi, Makoto ; Ochiai, Hideki
Author_Institution :
Dept. of Electr. & Comput. Eng., Yokohama Nat. Univ., Yokohama
Volume :
3
Issue :
3
fYear :
2009
fDate :
6/1/2009 12:00:00 AM
Firstpage :
430
Lastpage :
437
Abstract :
In this paper, trellis shaping (TS) is applied to dynamic range control of band-limited single-carrier high-order quadrature amplitude modulation (QAM) signals. With a newly designed shaping metric, we show that a signal with very low peak-to-average power ratio (PAR) can be achieved without significant loss of data rate. A specific example demonstrates that a band-limited transmission with spectral efficiency of 4.55 bit/s/Hz (including the redundancy due to the shaping) and PAR below 3 dB is achievable using a square 64-ary QAM constellation and a root raised-cosine filter with a roll-off factor 0.1. Furthermore, the proposed TS for high-order QAM can simultaneously reduce the average power and thus offers a shaping gain. The reduction of the PAR and average power can be flexibly controlled by adjusting a parameter associated with the shaping process.
Keywords :
quadrature amplitude modulation; trellis coded modulation; peak-to-average power ratio; shaping metric; single-carrier high-order QAM signals; single-carrier high-order quadrature amplitude modulation signals; trellis shaping; Bandwidth; Communication system control; Filters; OFDM; Peak to average power ratio; Pulse modulation; Quadrature amplitude modulation; Shape control; Signal design; Signal processing; Peak-to-average power ratio (PAR); single-carrier quadrature amplitude modulation (QAM); star QAM; trellis shaping (TS);
fLanguage :
English
Journal_Title :
Selected Topics in Signal Processing, IEEE Journal of
Publisher :
ieee
ISSN :
1932-4553
Type :
jour
DOI :
10.1109/JSTSP.2009.2020268
Filename :
4939434
Link To Document :
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