Open AccessComplementary peak reducing signals for TDCS PAPR reduction
Author(s) -
Chang Cheng,
Huan Hao,
Guo Jianmin,
Tao Ran
Publication year - 2017
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2016.0814
Subject(s) - reduction (mathematics) , bit error rate , signal (programming language) , computer science , spectral efficiency , waveform , algorithm , orthogonal frequency division multiplexing , frequency domain , mathematics , power (physics) , time domain , telecommunications , decoding methods , channel (broadcasting) , radar , geometry , physics , quantum mechanics , computer vision , programming language
Transform domain communication systems (TDCSs) are cognitive anti‐interference multi‐carrier communication systems with dynamic spectrum access. The inherent high peak‐to‐average power ratio (PAPR) of TDCS reduces the efficiency of the power amplifier. Adaptive waveform generation of the TDCS also causes the PAPR to vary according to the spectral conditions on hand. In this study, a complementary peak reducing signal (CPRS) method is proposed and analysed. It uses all unoccupied frequency bins to transmit data and uses all interfered frequency bins to generate CPRSs. Every data signal and its corresponding CPRS are orthogonal and complementary, so as to fully occupy all frequency bins. Therefore, the PAPR reduction of the composite signal with all frequency bins is considered. Once the optimal pseudo‐random phase sequence is determined, the sequence can adapt to all spectral conditions without side information, and the computational complexity for diverse spectral conditions is greatly reduced. Moreover, the orthogonality between the data signal and its CPRS in the frequency domain eliminates distortions and spectral spreading. As a component of the transmitting signal, CPRS may cause bit error rate (BER) loss. This study also proposes a signal power adjustment mechanism to achieve a compromise between PAPR reduction and BER loss.