Abstract
As an attractive technique for the reduction of the peak-to-average power ratio (PAPR) of multi-carrier transmission systems is proposed. The conventional partial transmitting sequence (PTS) combining can improve the PAPR statistics of a multi-carrier transmission systems signal. However, the optimum PTS technique requires an exhaustive search over all combinations of allowed phase factors, the search complexity increases exponentially with the number of sub-blocks. In this paper, a novel PTS based on electromagnetism-like (EMPTS) algorithm with threshold control structure is proposed to search the optimal combination of phase factor. The EMPTS algorithm not only reduces the PAPR significantly, but also decreases the computational complexity. Simulation results are conducted to demonstrate that the proposed scheme can achieve a good PAPR reduction with a better convergence rate compared with the various stochastic search techniques.
Highlights
Multi-carrier code division multiple-access (MCCDMA) communication systems are an attractive technique for high-speed data transmission because it has high spectral efficiency and is robust against multipath fading [1,2,3,4]
A modified Partial transmitting sequence (PTS) system is evaluated in terms of performance index of peak-to-average power ratio (PAPR) complementary cumulative distribution function (CCDF) and bit error rate (BER) by computer simulation
In this paper presented an EMPTS method that was used to obtain the optimal phase weighting factor for the PTS technique to reduce computational complexity and improve PAPR performance
Summary
Multi-carrier code division multiple-access (MCCDMA) communication systems are an attractive technique for high-speed data transmission because it has high spectral efficiency and is robust against multipath fading [1,2,3,4]. Various methods for reducing PAPR have been proposed for MC-CDMA system, such as deliberate clipping [5], partial transmit sequences [6,7,8,9], block coding [10], code selecting [11], and selective mapping (SLM) [12,13], subcarrier scrambling [14], etc. PTS method can reduce PAPR in the MC-CDMA system with a large number of subcarriers. We present a new technique for computing the phase weighting factors that achieves a better performance than the exhaustive search approach does. An Electromagnetism-like (EM) method [24,25] with threshold control structure is performed to find the phase weighting factors. We present a novel approach to tackle the PAPR problem to reduce the computational complexity based on the relationship between the weighing factors and the transmitted bit vectors.
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