PAPR reduction of SLM-OFDM using Helmert sequence without side information

A Novel Low Complexity Two-Stage Tone Reservation Scheme for PAPR Reduction in OFDM Systems

“…The simulation scenario is an OFDM-based system with 16 and 64 quadrature amplitude modulation (QAM), and the subcarrier length N is equal to 512 and 1024, individually. Furthermore, we compare seven schemes including original OFDM, PTS [ 21 ], interleave-PTS [ 23 ], ABC-PTS [ 22 ], SLM [ 18 ], TI [ 27 ], TR [ 28 ], and the proposed scheme by comparing the performance of PAPR, for 16-QAM and 64-QAM is shown in Figure 9 a,b and Figure 10 a,b, where (a) and (b) are shown as N = 512 and N = 1024, respectively. To observe the approach of the convergence of the I-TR signal more clearly, the CCDF estimation and PAPR values are compared with the distinct number of iterations of I-TR, as shown in Figure 11 and Figure 12 , respectively.…”

“…The selective mapping (SLM) method is one of the schemes used to reduce PAPR in OFDM system, and its block diagram is shown in Figure 2 [ 18 ]. In the SLM algorithm, the input signal sequence and the rotation factor group , by component-wise vector multiplication can obtain as follows: where ⊗ is component-wise multiplication of two vectors, and V is the divide group number, and , .…”

“… The PAPR performance of SLM [ 18 ], PTS [ 21 ], ABC−PTS [ 22 ], interleave−PTS [ 23 ], TI [ 27 ], TR [ 28 ], and I−TR for 16−QAM ( a ) N = 512 and ( b ) N = 1024. …”

“…Among them, the clipping technique [ 14 , 15 ] is the easiest to implement, because only the input signal needs to be limited, but the clipped signal is prone to nonlinear distortion, and the location and size of the clipping are difficult to decide and store, which results in BER performance degradation [ 16 ] and spectral efficiency decline. In the SLM scheme [ 17 , 18 , 19 ], the frequency domain signals are multiplied by the rotation factor vector and generate several candidate signals, and the one with the minimum PAPR is selected for transmission.…”

Elimination of Noise Distortion for OFDM Systems by Compressed Sensing Based on Distance Metric

“…However, OFDM also exists many problems of its application, one of which is the high PAPR, which limits effective utilization of transmitting power. Aiming at the high PAPR problem, many effective mitigation methods have been proposed [4]- [10]. These methods are roughly divided into three categories: probability technology, coding technology and signal pre-distortion technology.…”