A Novel SLM Scheme for PAPR Reduction in OFDM Systems

Abstract

Orthogonal frequency-division multiplexing (OFDM) is an attractive transmission technique for high-bit-rate communication systems. One major drawback of OFDM is the high peak-to-average power ratio (PAPR) of the transmitter's output signal. A novel selected mapping (SLM) scheme is proposed, which employs matrix transformation, cyclically shifting, and linear combining algorithm to generate new candidates. The novel scheme requires only one IFFT and gets more candidate transmission signals throughout the entire process. The complexity analysis and simulation results show that this algorithm can dramatically reduce computational complexity comparing with the conventional SLM scheme as in

Low-Complexity SLM PAPR Reduction Approach for UFMC Systems

“…The authors of [19] applied the same concept in UFMC system and proposed a reduced-complexity efficient SLM (E-SLM) approach which generates U w UFMC waveforms using U m UFMC modulators where in this case U m = 2 √ U w . In this paper, a low complexity SLM approach is proposed in order to alleviate the high complexity associated with UFMC system inspired by [9] and [10]. The proposed modified SLM (P-SLM) approach generates U w alternative UFMC waveforms using U m UFMC modulators with U m = √ U w .…”

PAPR Reduction in UFMC for 5G Cellular Systems

“…Additionally, the encoding schemes cause low data rate efficiency [27,28]. On the other side, the probabilistic methods, such as the selected mapping (SLM) [29][30][31] and partial transmit sequence (PTS) [28,32], introduce random phase shifts on the transmitted symbols as a pre-coding step without causing significant distortions. However, this comes at a cost of a low spectral efficiency (SE), owing to the side information transmitted to the receiver to recover the original symbol vector.…”