Modified selective mapping based on squaring construction

Abstract

Summary This study proposed a novel technology, squaring construction with selective mapping (SC‐SLM), aimed at reducing the peak‐to‐average power ratio (PAPR); the technology integrates squaring construction codes and selective mapping (SLM). SLM is a frequently adopted technology for reducing the PAPR of signals, and much SLM research has focused on designing a systematic structure for SLM's phase generation mechanisms. SLM involves a high overall system complexity because its phase generation mechanism does not incorporate a systematic structural design. Squaring construction codes were employed in this study to establish a phase generation mechanism with a systematic structure for SLM; additionally, the generator matrix of the squaring construction codes was used to encode the transmitted data to enable transmitted signals to correct errors. Using squaring construction is conducive to the design of codes with varying code lengths to correct errors and protect the transmission system. To ensure that SC‐SLM performs comparably with conventional SLM in terms of PAPR reduction, we established (1) two‐phase generation mechanisms in SC‐SLM and (2) a selection rule to determine the more suitable mechanism for generating scrambling phases under different circumstances. According to the simulation results, the performance of SC‐SLM in PAPR reduction was comparable with that of the conventional SLM, had systematically structured phase generation mechanisms, and was capable of error correction.

Low-complexity selective mapping technique for PAPR reduction in downlink power domain OFDM-NOMA

“…Following that, in the time domain, U alternatives of the OFDM-NOMA symbol x are generated, such that x u = IF F T (A • P u ) , where (•) denotes elementwise multiplication. Finally, x u with the lowest PAPR among the U alternatives is chosen, as follows[43]:…”