Low Complexity Blind SLM for PAPR reduction of HF XL systems

The High Frequency (HF) multi-sideband transmission technology combines multiple 3KHz channels, which effectively improves the transmission rate of HF communication system, but also inevitably brings the defect of high peak-to-average-power ratio (PAPR). In this paper, a low-complexity blind selected mapping (SLM) algorithm for HF multi-sideband systems is proposed. Cyclic redundancy check (CRC) is performed on the received signal during phase recovery, and the result of the checksum can be used to determine whether the current signal is correctly recovered in phase. The expressions for the number of iterative computations are derived and the simulation results show that low-complexity blind SLM algorithm effectively reduces the computational complexity without increasing the bit error rate(BER).

I. Introduction

With the growing demand for transmission rate of HF communication services and the expansion of networked applications, narrowband low-speed data transmission can no longer meet the needs of communication development, because the maximum transmission rate of traditional 3 kHz HF channels does not exceed 9.6 kbps [1]. In 2011, the U.S. Department of Defense released a new version of the 3G HF standard called MIL-STD188-110C [2], which contains a wideband highfrequency (WBHF) specification to support high-speed HF data communications, proposing a shortwave waveform design solution with a maximum bandwidth of 24 kHz. 2017 the U.S. Army proposed the MIL-STD188-110D standard, which is described in Appendix D for a single continuous bandwidth from 3 KHz to 48 KHz of high-frequency data modem waveforms [3], and retains the 39-tone parallel waveform.