Constant Envelope Orthogonal Frequency-Division Multiplexing with Selective Mapping
Hao Chen, Yanrui Wang, Lilin Dan, Juan Zhang, Yue Xiao · 2024
Constant envelope orthogonal frequency-division multiplexing (CE-OFDM) employs phase modulation, yielding an exceptionally low peak-to-average power ratio (PAPR), thus positioning it as a highly promising candidate for future wireless communications, especially in the context of wireless sensor networks (WSNs). Nonetheless, phase modulation inherently introduces phase wrapping issues, which detrimentally impact the bit error rate (BER) performance of CE-OFDM. In this paper, we introduce the selective mapping (SLM) technique to address this challenge. By selecting sequences with the minimum number of phase jumps from a finite set of candidates, the BER performance is substantially enhanced. Simulation results substantiate that the integration of SLM effectively mitigates phase wrapping in CE-OFDM, achieving significant BER improvements while preserving the constant envelope property of CE-OFDM.