Analyzing the effects of peak to average power ratio and digital predistortion in orthogonal frequency division multiplexing (OFDM) systems

In this paper, a new adaptive PAPR reduction scheme is proposed by which the PAPR of the OFDM signal can be reduced to keep the value lower than a predefined threshold level. A conventional companding is used as a technique to reduce the PAPR of the OFDM signal. If the PAPR of the OFDM signal is higher than any predefined level, one or more times companding operations are performed until the PAPR becomes lower than that level. On top of that, no companding is applied if the signal's PAPR is lower than the predefined level. However, there is a trade-off between the improvement of the PAPR and BER which may be optimized based on any specific application requirements

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PAPR Reduction Techniques and Their BIT Error Rate Measurement at OFDM in LTE System

Rana¹,

Tithy²,

Rahman³

et al. 2022

IJANS

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Orthogonal frequency division multiplexing (OFDM) has become an indispensable part of waveform generation in wideband digital communication since its first appearance in digital audio broadcasting (DAB)and it is indeed in use. These descriptions are simplified version of the detailed descriptions provided by 3gpp. It is a superior technology for the high-speed data rate of wire-line and wireless communication systems. The OFDM has many advantages over other techniques such as its high capacity and immunity against multipath fading channels. However ,one of the main drawbacks of the OFDM system is the high-peak-to-average power ratio (PAPR) that leads the system to produce in-band distortion and out-of-band radiation because of the non-linearity and reduces its efficiency is the distortion of the signal caused at the High Power Amplifier (HPA) of a transmitter . Therefore, it is highly desirable to reduce the PAPR of an OFDM signal. For this, numerous techniques have been proposed to overcome the PAPR problem such as i) selective mapping(SLM) ii) partial transmit sequence (PTS), iii) clipping, iv) clipping and filtering. In this paper, the PTS technique was analytically reviewed as one of the important methods to reduce the high PAPR problem. Simulations are used to analyze the efficiency of the techniques used which signifies OFDM to be providing much better PAPR reduction and a better Bit Error Rate (BER) . From simulation results clipping method shows good PAPR reduction with significant amount of BER degradation. Clipping and filtering method shows slight increase in PAPR with small degradation in BER performance than Clipping method and both methods are computationally less complex. PTS provides good PAPR reduction with high computational complexity.

show abstract

Analyzing the effects of peak to average power ratio and digital predistortion in orthogonal frequency division multiplexing (OFDM) systems

Cited by 3 publications

References 15 publications

Depiction of Peak to Average Power Ratio Reduction Scheme and potentials for 5G

Depiction of Peak to Average Power Ratio Reduction Scheme and potentials for 5G

Adaptive Companding as a PAPR Reduction Technique of an OFDM Signal

PAPR Reduction Techniques and Their BIT Error Rate Measurement at OFDM in LTE System

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