Suppressing Alignment: Joint PAPR and Out-of-Band Power Leakage Reduction for OFDM-Based Systems

摘要

Orthogonal frequency division multiplexing (OFDM) inherently suffers from twomajor drawbacks: high out-of-band (OOB) power leakage and high peak-to-averagepower ratio (PAPR). This paper proposes a novel approach called suppressingalignment for the joint reduction of the OOB power leakage and PAPR. Theproposed approach exploits the temporal degrees of freedom provided by thecyclic prefix(CP), a necessary redundancy in OFDM systems, to generate asuppressing signal, that when added to the OFDM symbol, results in markedreduction in both the OOB power leakage and PAPR. Additionally, and in order tonot cause any interference to the information data carried by the OFDM symbol,the proposed approach utilizes the wireless channel to perfectly align thesuppressing signal with the CP duration at the OFDM receiver. Essentially,maintaining a bit error rate (BER) performance similar to legacy OFDM withoutrequiring any change in the receiver structure.