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クリッピング・アンド・フィルタリングを適用したOFDMシステムのための低演算受信機の設計と解析

孫 瑩 横浜国立大学 DOI:info:doi/10.18880/00014165

2022.01.24

概要

Orthogonal frequency division multiplexing (OFDM) is a multi-carrier scheme that is widely adopted in a variety of communications systems, and one of the core technologies in the next- generation wireless communications systems. However, the downside is that its signal exhibits a very high peak-to-average power ratio (PAPR). Therefore, many techniques have been pro- posed for PAPR reduction of OFDM. Among them, clipping and filtering (CAF) is the simplest method. It can effectively reduce the PAPR of the band-limited OFDM signal, but its price is increasing in-band distortion. To mitigate the performance degradation caused by the in-band distortion, several iterative distortion recovery techniques either in the time domain or the fre- quency domain have been proposed. The time-domain approach is represented by decision-aided reconstruction (DAR), whereas the well-known frequency-domain approach is clipping noise cancellation (CNC).

　In this dissertation, the effectiveness of CAF and its limitation are analyzed for uncoded OFDM systems. The closed-form signal-to-distortion power ratio (SDR) expression is derived, which is further analyzed to obtain the limiting bounds in terms of signal-to-noise-plus-distortion power ratio (SNDR) and resulting symbol error rate (SER). A time-domain distortion model is introduced to describe the OFDM signal with CAF based on the analytical results, and the per- formance lower bounds of the two compensation methods are developed. Theoretical analysis and simulation results reveal that the time-domain compensation may suffer from unrecoverable distortion when filtering is applied at the transmitter side, while the frequency-domain compen- sation does not show such a behavior.

　The results of the frequency-domain compensation approach, however, reveal that there is a gap between the achievable SER by CNC and that based on an ideal clipping-free system. Therefore, an additional compensation scheme based on the maximum likelihood (ML) metric is further proposed. The simulation results reveal that the proposed method can even outperform the unclipped OFDM system with only a moderate increase of complexity from CNC. Moreover, in the case of frequency-selective Rayleigh fading channels, significant gains associated with the diversity effect can be achieved.

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