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.
Highlights
Due to the popularity of gaming, multimedia services, and others, new wireless communication technology has been growing with higher data rates which naturally leads to higher bandwidths with low latency and high Quality of Service (QoS) [1]
PERFORMANCE OF HYBRID TECHNIQUE As Orthogonal Frequency Division Multiplexing (OFDM) suffers from high Peak-to-Average Power Ratio (PAPR), the proposed hybrid PAPR reduction methods have been implemented for reducing the system complexity and increasing the BER performance
From the above PAPR reduction methods for all amplifier models the Partial Transmit Sequence (PTS) (V = 2) with companding, Selected Mapping (SLM) (U = 8) with companding and hybrid (U = 8 and V = 2) technique presentation is virtuous than others
Summary
Due to the popularity of gaming, multimedia services, and others, new wireless communication technology has been growing with higher data rates which naturally leads to higher bandwidths with low latency and high Quality of Service (QoS) [1]. A new hybrid method [38] from the literature, companding is the low complex PAPR reduction technique and doesn’t expand bandwidth, without increasing complexity i.e., with same side information and expanding the bandwidth, the optimum PAPR of OFDM system can be TABLE 1. Since the dynamic range of μ-law is larger than A-law in the speech signal, the PTS with μ-law, SLM with μ-law and hybrid technique can be appreciated as the useful techniques with reliable PAPR reduction performance with low complexity and high gain. The active range of μ-law is larger than A-law and μ-law realms, the encoded information at lower amplitudes which can be befuddled by using linear methods, the power efficiency of OFDM system can be increased by using PTS with μ-law, SLM with μ-law and Hybrid with μ-law methods. Accomplishing low power efficiency is the strong inspiration for using a PAPR reduction techniques
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