Title :
PAR reduction via constellation shaping
Author :
Kwok, Henry ; Jones, Douglas
Author_Institution :
Illinois Univ., Urbana, IL, USA
Abstract :
We introduce a novel scheme using a constellation shaping approach to reduce the peak-to-average ratio (PAR) in orthogonal frequency-division multiplexing (OFDM) systems. In the time domain, the peak power bound traces out a hypercube boundary. We map this square time-domain boundary back to the frequency domain via the DFT and construct a method for indexing the OFDM constellation points. The encoding and decoding of the constellation use generators and relations from group theory. The end result is a coding scheme with nearly 20 dB of PAR reduction with no reduction in data rate or performance
Keywords :
OFDM modulation; decoding; discrete Fourier transforms; encoding; frequency-domain analysis; group theory; time-domain analysis; DFT; OFDM systems; PAR reduction; coding; constellation shaping; decoding; frequency domain; generators; group theory; hypercube boundary; orthogonal frequency-division multiplexing; peak power bound; peak-to-average ratio reduction; square time-domain boundary; time domain; Baseband; Decoding; Degradation; Frequency division multiplexing; Frequency domain analysis; Hypercubes; Indexing; Noise level; OFDM; Peak to average power ratio;
Conference_Titel :
Information Theory, 2000. Proceedings. IEEE International Symposium on
Conference_Location :
Sorrento
Print_ISBN :
0-7803-5857-0
DOI :
10.1109/ISIT.2000.866461
