Pilot-based reference amplitude compensation for ultra-multi-level PAM-SSB-DFTs-OFDM

摘要

Ultra-multi-level PAM-SSB-DFTs-OFDM (Single Side Band DFT spreading Orthogonal Frequency Division Multiplexing) was proposed as one of the attractive approaches to achieve higher spectrum efficiency since it has advantages of lower PAPR (Peak to Average Power Ratio) than OFDM and robustness against reference carrier phase error. However, BER performance degradation caused by reference amplitude error is as large as that of conventional QAM signals, especially for ultra-multi-level modulation. To solve this problem, this paper proposes pilot-based reference amplitude compensation to improve BER performance degradation caused by reference amplitude error. This paper describes pilot signal design and BER performance comparison evaluation when non-linear amplifier is used.