Abstract
Orthogonal frequency division multiplexing (OFDM) has the advantages of spectral efficiency in wideband communication systems such as 3GPP long-term evolution (LTE). However, OFDM suffers from a high peak-to-average power ratio (PAPR). Several schemes, such as peak windowing, clipping and filtering, have been proposed in order to reduce the PAPR in OFDM-based systems. However, these schemes reduce the peak signals regardless of the PAPR pattern; thus, while guaranteeing error vector magnitude (EVM) and adjacent channel leakage ratio (ACLR) performances they do not efficiently reduce the PAPR. In this paper, we propose a hybrid peak-windowing scheme that selects the optimum PAPR reduction scheme according to the PAPR pattern, and we evaluate its performance using a real LTE test bed. Our test results show that the proposed scheme outperforms the existing schemes in terms of EVM, ACLR, and power consumption.
Highlights
With the increasing demand for high data rate wireless communications, 3GPP long-term evolution (LTE) has become one of the dominant wireless access technologies
With the proposed hybrid peak windowing (HPW) scheme, we realized improved performance by selecting a suitable peak-to-average-power ratio (PAPR) reduction scheme for the signal amplitude distribution
Even though the performance in terms of the complementary cumulative distribution function (CCDF), error vector magnitude (EVM), and adjacent channel leakage ratio (ACLR) are related to many other hardware component characteristics as design metrics, we have demonstrated that the proposed HPW scheme outperforms the clipping and filtering (CAF) and peak windowing (PW) schemes
Summary
With the increasing demand for high data rate wireless communications, 3GPP long-term evolution (LTE) has become one of the dominant wireless access technologies. The high PAPR signals over the dynamic range of a power amplifier (PA) and digital-to-analog converter (DAC) lead to non-linear distortions such as the spectral regrowth phenomena, in-band noise, and increased quantization errors The CAF scheme is a simple and effective scheme that is used to reduce the PAPR; it still leads to performance degradation of the EVM and ACLR because of the peak regeneration phenomenon caused by its filtering operation. Another solution is the PW scheme, which can efficiently reduce high-PAPR signals compared to the CAF scheme.
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