Analysis of Hybrid PAPR Reduction Methods of OFDM Signal for HPA Models in Wireless Communications

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) suffers from a high Peak-to-Average Power Ratio (PAPR). Designing a High Power Amplifier (HPA) with high PAPR is not a wise technique as it roots the amplifier to operate in a non-linear region which is intricate. Linearity and power efficiency are important constraints of HPA which cannot be achieved at the same time. Therefore, perfect linearity is observed when efficiency is low or vice versa and efficiency can be improved by decreasing the PAPR. In this paper, the PAPR is mitigated by using Partial Transmit Sequence (PTS), Selected Mapping (SLM), Hybrid and proposed methods. Analysis of OFDM with high PAPR passing through different HPA models is evaluated in terms of Power Spectral Density (PSD), gain and efficiency for all PAPR reduction methods considered in this work. The results are encouraging by using hybrid PAPR reduction method, HPAs can be operated in a linear region to provide higher efficiency compared to non-hybrid PAPR reduction methods. Hence, hybrid PAPR reduction methods can be used even in future wireless communications systems including 5G and beyond. INDEX TERMS Companding, high power amplifier models, orthogonal frequency division multiplexing, peak to average power ratio, partial transmit sequence, selected mapping.

Application of 5G new radio for satellite links with low peak‐to‐average power ratios

“…The TDOC R1‐1912727 28 uses a PAPR level of 4 dB and quadrature phase‐shift keying (QPSK) modulation to show that the performance becomes progressively worse than without PAPR reduction in each coding level. Thota et al 29 compares various techniques (including the ICF method), though still employing high PAPR levels. Actually, the related literature shows that higher order modulations (or MODCODs) are more sensitive to PAPR reduction side effects than lower order ones.…”

A Novel Hybrid Precoding-Companding Technique for Peak-to-Average Power Ratio Reduction in 5G and beyond

“…For example, PTS-SLM [ 17 ], and PTS-Interleaving [ 18 ] are examples of hybridizing techniques that belong to the same category (i.e., MSR). On the other hand, ACE-PTS [ 19 ], precoding-clipping [ 20 ], PTS-companding [ 21 ], and precoding-companding [ 22 ] are examples of hybridizing different PAPR reduction techniques from different categories. Hybrid precoding-companding techniques are attractive as they require small computational complexity to achieve large PAPR reduction gain.…”

Bit Error Rate Analysis of NOMA-OFDM in 5G Systems With Non-Linear HPA With Memory

“…Thus, studies that analyze the effect of HPA in OFDM are very important. In the literature, several works that explore the impact of HPA without memory can be found, for instance, the performance analysis in terms of SER, BER, and power spectral density [22][23][24], analysis of techniques for reducing the PAPR and linearization of HPA [25][26][27], implementation of PAPR reduction techniques [28][29][30] among others. However, although for wideband systems, memory effects should not be disregarded, very few papers analyzing this scenario can be found in the literature [31].…”