PAPR Reduction in OFDM Systems using Partial Transmit Sequence combined with Cuckoo Search Optimization Algorithm (ICAT16-0286)

PAPR reduction performance of bat algorithm in OFDM systems

“…The PAPR characteristics of discrete-time OFDM signals and continuous-time OFDM signals are pretty much similar to each other. The proper PAPR performance can be accomplished through the implementation of LN-point IFFT of symbol sequence with (L-1)N zero-padding [9][10][11][12][13][14][15][16]. In the discrete time domain, the oversampling factor, L, is generally acknowledged as 4.…”

“…In recent years, suboptimal search strategies are applied to alleviate complexity of optimal phase factor search tasks. Some studies proposed the combination of PTS technique with certain suboptimal search strategies such as random search (RS) [11], cuckoo search (CS) [12], differential evolution (DE) [13], parallel tabu search [14], artificial bee colony [15], harmony search (HS) [16], and particle swarm optimization (PSO) [17]. Swarm intelligence is noted as a strong method appropriate for optimization problems.…”

“…However, the search of all possible phase factors to find optimum phase factor set which produces lowest PAPR is an exhaustive search task. The complexity of search task enlarges exponentially with the increase in number of sub-blocks and eliminates the feasibility in practical implementations of high-speed data transmissions [11][12][13][14][15][16].…”

“…to support high-speed wide band digital transmission and reception. Nevertheless, OFDM systems stricken high peak-to-average ratio (PAPR) which can induce signal distortions, reduction in efficiency of RF amplifier, complexity in digital-to-analog and analog-todigital converters, thus reduction of PAPR has become a research hotspot in the field of digital communications [4][5][6][7][8][9][10][11][12][13][14][15][16].…”

“…In order to reduce the PAPR in OFDM systems, various methods such as; clipping technique [5], coding technique [6], pre-distortion technique [7], transform schemes [8], and probabilistic scrambling techniques [9][10][11][12][13][14][15][16], are found in the literature. The probabilistic scrambling techniques are based on scrambling of the input data and transmission of data sequence with lowest PAPR.…”