Low-Complexity Blind Selected Mapping Scheme for Peak-to-Average Power Ratio Reduction in Orthogonal Frequency-Division Multiplexing Systems

Abstract

Orthogonal frequency-division multiplexing (OFDM) is an attractive multicarrier technique for the simplicity of equalization and high data throughput. However, the transmitted OFDM signal has a very high peak-to-average power ratio (PAPR), which severely degrades the performance of practical OFDM systems and reduces the efficiency of high-power amplifiers (HPA). The selected mapping (SLM) scheme is an effective PAPR reduction method of OFDM signals. However, this approach usually requires side information (SI) transmission, which increases the difficulty of the hardware implementation with high complexity and reduces the data transmission rate. In this paper, based on designing phase rotation vectors in the time domain, a novel blind SLM method with low complexity is proposed to reduce the PAPR of OFDM signals. At the transmitter, the proposed method properly designs the phase rotation vectors in the time domain, which can be considered as an equivalent wireless channel without SI transmission. At the receiver, the effect of phase rotation vectors can be removed by the conventional channel estimation method, and the data demodulation processing can be easily performed by the frequency domain equalization. Simulation results show that the proposed scheme can achieve low complexity in PAPR reduction and has great robustness in bit error rate (BER) performance compared to the other low-complexity SLM PAPR schemes.

A Novel Clipping-Based Method to Reduce Peak-To-Average Power Ratio of OFDM Signals

“…In order to describe the probability that the amplitude of the signal takes on the value less than or equal to a certain level, the cumulative distribution function (CDF) is commonly adopted [24]. According to (14), the CDF of |x(n)| can be expressed as…”

“…The commonly used distortionless-based techniques include selective mapping (SLM), partial transmit sequence (PTS) and so on. They achieve the PAPR reduction by constructing multiple alternative signals and selecting the signal with the Information 2020, 11, 113 2 of 11 lowest PAPR signal for transmission [14]. These methods usually do not cause nonlinear distortion, but require high computational complexity and side-band information to be transmitted [15,16].…”

Palm Date Leaf Clipping: A New Method to Reduce PAPR in OFDM Systems

“…Its principle consists of generating U alternative sequences and choosing the one that has the minimum PAPR value [7,8]. Several improvements and variants of the SLM method have been proposed to reduce its complexity [8] by avoiding side information [9,10]. Another technique called Partial Transmit Sequences (PTS) was proposed in [11].…”

A Hybrid PAPR Reduction Method Based on SLM and Multi-Data Block PTS for FBMC/OQAM Systems

“…In the past decade, the researchers have proposed a number of PAPR reduction methods of OFDM signals, such as the selective mapping (SLM) [13], partial transmit sequence (PTS) [14], tone reservation (TR) scheme [15], active constellation extension (ACE) [16] and so on. Considering that there is a certain similarity between the OFDM technology and FBMC/OQAM technology, it is natural for researchers to study how to use the PAPR reduction methods of OFDM signals to reduce the PAPR of FBMC/OQAM signals.…”