Title :
Constellation shifting based on QAM with gray coding for PAPR reduction of OFDM systems
Author :
Yijun Shi ; Dazhi He ; Wei Huang ; Yin Xu ; Yunfeng Guan ; Jun Sun
Abstract :
High PAPR has long been a main drawback of OFDM systems. With the lengthening of OFDM symbol and the increasing popularity of high-order modulation, such as OFDM symbol size of 32768 and 256-QAM in DVB-T2, reducing PAPR is of growing importance. In this paper, a constellation shifting technique based on QAM with gray coding will be introduced to reduce PAPR. This technique keeps the minimum Euclidean distance of the constellation points and gray coding´s benefit, costs no extra bandwidth, and consumes little extra power.
Keywords :
Gray codes; OFDM modulation; digital video broadcasting; modulation coding; quadrature amplitude modulation; DVB- T2; OFDM system; PAPR reduction; QAM; constellation shifting technique; gray coding; high-order modulation; minimum Euclidean distance; Digital video broadcasting; Encoding; Euclidean distance; Frequency-domain analysis; Peak to average power ratio; Quadrature amplitude modulation; Constellation shifting; Gray coding; OFDM; Peak-to-average power ratio; QAM;
Conference_Titel :
Broadband Multimedia Systems and Broadcasting (BMSB), 2013 IEEE International Symposium on
Conference_Location :
London
DOI :
10.1109/BMSB.2013.6621730