Abstract
One of the severe drawbacks of orthogonal fre-quency division multiplexing (OFDM) is high Peak-to-Average Power Ratio (PAPR) of transmitted OFDM signals. During modulation the sub-carriers are added together with same phase which increases the value of PAPR, leading to more interference and limits power efficiency of High Power Amplifier (HPA), it’s requires power amplifier’s (PAs) with large linear oper-ating ranges but such PAs are difficult to design and costly to manufacture. Therefore, to reduce PAPR various methods have been proposed. As a promising scheme, partial transmit sequences (PTS) provides an effective solution for PAPR reduction of OFDM signals. In this paper, we propose a PAPR reduction method for an OFDM system with variation of phases based on PTS schemes and Solid State Power Amplifiers (SSPA) of Saleh model in conjunction with digital predistortion (DPD), in order to improve the performance in terms of PAPR, the HPA linearity and for the sake of mitigating the in-band distortion and the spectrum regrowth. The simulation results show that the proposed algorithm can not only reduces the PAPR significantly, but also improves the out-of-band radiation and decreases the computational complexity.
Highlights
A combination of multiple-input multiple-output (MIMO) with orthogonal frequency division multiplexing (OFDM) has lead to signicant advancement in wireless communication systems
This paper investigates the performance of Peak to Average Power Ratio (PAPR) reduction in OFDM and MIMO-OFDM system
The systems is carried out based on IEEE 802.11a and IEEE 802.16 standard with N=64 and N=256 subcarriers successively. 104 and 105 OFDM symbols are randomly chosen for the simulation with QPSK modulation and set the oversampling factor L=4 for selecting and estimating the signal with minimum PAPR
Summary
A combination of multiple-input multiple-output (MIMO) with orthogonal frequency division multiplexing (OFDM) has lead to signicant advancement in wireless communication systems. It has been receiving a great deal of attention as a solution of high-quality service for generation. OFDM systems has been adopted by several emerging wireless applications, such as WiMAX and digital video broadcasting/digital audio broadcasting (DVB/DAB) [1], thanks to its robustness over frequency selective fading channels and high bandwidth efficiency [2]. The high PAPR reduces the efficiency of OFDM systems by introducing the intermodulation distortion and undesired out-of-band radiation, due to, the nonlinearity of the high power amplifier (HPA). Many PAPR reduction techniques have been proposed and each of them has their own advantages and disadvantages [3], such as interleaving [4], clipping, companding [5], selective mapping (SLM) [6], [7], partial transmit sequence (PTS) [8]–[10], tone reservation [11], coding technique [12], adaptive mode with low complexity [13], signal set expansion [14], and active constellation expansion [15]
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