Title :
PAPR reduction of OFDM signals using partial transmit sequence: an optimal approach using sphere decoding
Author :
Alavi, Ali ; Tellambura, Chintha ; Fair, Ivan
Author_Institution :
Dept. of Electr. & Comput. Eng., Alberta Univ., Edmonton, Alta., Canada
Abstract :
Partial transmit sequence (PTS) is a promising technique for peak-to-average-power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) systems. Computation of optimal PTS weight factors via exhaustive search requires exponential complexity in the number of subblocks; consequently, many suboptimal strategies have been developed to date. In this letter, we introduce an efficient algorithm for computing the optimal PTS weights that has lower complexity than exhaustive search.
Keywords :
OFDM modulation; computational complexity; decoding; exponential distribution; sequences; OFDM signal; PAPR reduction; exhaustive search; exponential complexity; optimal PTS weight factor; orthogonal frequency division multiplexing; partial transmit sequence; peak-to-average-power ratio; sphere decoding; Block codes; Decoding; Downlink; Error correction codes; Frequency division multiplexing; Iterative algorithms; Land mobile radio cellular systems; OFDM; Partial transmit sequences; Peak to average power ratio;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2005.11014
