%K Analysis of various; Constant envelope; Hadamard transforms; Matrix transforms; OFDM systems; Orthogonal frequency division multiplexing systems; Out-of-band radiation; PAPR reduction; Peak to average power ratio; Precoders; Precoding; Pulse-shaping; QPSK modulation; Root-raised cosines; Simulation result; Sub-carriers; Transmission spectrums; ZCT-C-OFDM system; ZCT-R-OFDM system, Electric network analysis; Filling; Frequency allocation; Pulse shaping circuits; Quadrature phase shift keying; Telecommunication systems, Orthogonal frequency division multiplexing
%O cited By 15; Conference of 2010 Asia Pacific Conference on Circuit and System, APCCAS 2010 ; Conference Date: 6 December 2010 Through 9 December 2010; Conference Code:85160
%P 1131-1134
%C Kuala Lumpur
%D 2010
%L scholars857
%X This paper studies the Peak to Average Power Ratio (PAPR) improvements in various precoding based Orthogonal Frequency Division Multiplexing (OFDM) systems. In particular, the Zadoff-Chu matrix Transform (ZCT) precoder based PAPR reduction technique is analyzed. The ZCTs are obtained from Zadoff-Chu (ZC) sequences by filling ZCT kernel row-wise or alternatively column wise. Row wise filling gives rise to Constant Envelope OFDM (CE-OFDM) system with 0 dB PAPR, while column wise filling give rise 7.8 dB, at clip rate of 10-3 with system subcarriers N = 64 for QPSK modulation. However, since even CE-OFDM systems are required to operate with pulse shaping that helps in keeping out-of-band radiation low and meeting the transmission spectrum mask requirement, the PAPRs are no longer 0 dB. Therefore, in this paper, we present PAPR analysis of various precoding based OFDM systems with the popular Root Raised Cosine (RRC) pulse shaping. Simulation results show that, the ZCT Row-wise precoder based OFDM (ZCT-R-OFDM) system has lower PAPR than the ZCT Column-wise precoder based OFDM (ZCT-C-OFDM) system, the Hadamard Transform precoder based OFDM (WHT-OFDM) systems and the conventional OFDM systems. © 2010 IEEE.
%R 10.1109/APCCAS.2010.5775063
%T A new ZCT precoded OFDM system with pulse shaping: PAPR analysis
%J IEEE Asia-Pacific Conference on Circuits and Systems, Proceedings, APCCAS
%A I. Baig
%A V. Jeoti