DocumentCode :
2966524
Title :
An algorithm for reducing the peak to average power ratio is a multicarrier communications system
Author :
Tarokh, Vahid ; Jafarkhani, Hamid
Author_Institution :
AT&T Bell Labs., Florham Park, NJ, USA
Volume :
1
fYear :
1999
fDate :
36342
Firstpage :
680
Abstract :
One of the main implementation disadvantages of a multicarrier communication system is the possibly high peak to average power ratio of the transmitted signals. One proposed solution is given by Jones and Wilkinson (see IEEE 46th Vehicular Technology Conference, Atlanta, p.904-8, 1996). It is based on applying a specific phase shift (not dependent on the codeword) to each dimension of the transmitted codewords. These phase shifts are known both to the transmitter and the receiver. Thus the phase shifts can be compensated for in the receiver without changing the distance properties of the code. Therefore, neither the rate nor the code performance is sacrificed. The phases need only once he computed off-line and the complexity of the system does not increase. Our contribution is to provide an algorithm to compute the phases that minimize the maximum peak to average power ratio taken over all possible transmitted signals. The new algorithm enables us to apply the Jones-Wilkinson method to various medium length as well as long codes of practical interest, a computational task for which no solution was known before. We apply our algorithm to some of the codes adapted for use in the physical layer of future wireless local area networks by the ETSI BRAN Hiperlan-II standardization committee. We report the computed reductions in peak to average power ratio
Keywords :
OFDM modulation; convolutional codes; standardisation; wireless LAN; ETSI BRAN Hiperlan-II standardization committee; Jones-Wilkinson method; Multicarrier communications; OFDM; algorithm; convolutional code; long codes; maximum peak to average power ratio; medium length codes; multicarrier communications system; peak to average power ratio reduction; phase shift; physical layer; receiver; transmitted codeword; wireless local area networks; Decoding; Discrete Fourier transforms; Drives; OFDM; Peak to average power ratio; Physical layer; Power system modeling; Standardization; Telecommunication standards; Wireless LAN;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 1999 IEEE 49th
Conference_Location :
Houston, TX
ISSN :
1090-3038
Print_ISBN :
0-7803-5565-2
Type :
conf
DOI :
10.1109/VETEC.1999.778247
Filename :
778247
Link To Document :
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