Title :
PAPR analysis of DHT-precoded OFDM system for M-QAM
Author :
Baig, Imran ; Jeoti, Varun
Author_Institution :
Electr. & Electron. Eng. Dept., Univ. Teknol. PETRONAS, Bandar Seri Iskandar, Malaysia
Abstract :
High Peak to Average Power Ratio (PAPR) is one of the major drawbacks in Orthogonal Frequency Division Multiplexing (OFDM). The High PAPR increases the complexity of Analogue to Digital (A/D) and Digital to Analogue (D/A) convertors and also reduces the efficiency of RF High Power Amplifier (HPA). In this paper we present an analysis of Discrete Hartley Transform (DHT) precoded OFDM system using M-QAM (where M=16, 32, 64, 256). We compare the computer simulation results of DHT precoded OFDM system with DFT precoded OFDM system, Walsh Hadamard Transform (WHT) precoded OFDM system, Selected Mapping (SLM) based OFDM system and OFDM conventional. Simulation results show that the PAPR of DHT precoded OFDM system is lower than WHT precoded OFDM system, SLM-OFDM system and OFDM conventional. We also concluded in this paper that DFT precoded OFDM system has zero PAPR.
Keywords :
Hadamard transforms; OFDM modulation; analogue-digital conversion; digital-analogue conversion; discrete Hartley transforms; power amplifiers; precoding; quadrature amplitude modulation; radiofrequency amplifiers; A/D converter; D/A converter; DFT; DHT-precoded OFDM system; HPA; M-QAM; PAPR analysis; RF high power amplifier; SLM; WHT; Walsh Hadamard transform; analogue-digital converter; digital-analogue converter; discrete Hartley transform; high peak to average power ratio; orthogonal frequency division multiplexing; selected mapping; Discrete Fourier transforms; Mathematical model; Modulation; Peak to average power ratio; Simulation; DFT precoder; DHT precoder; HPA; PAPR;
Conference_Titel :
Intelligent and Advanced Systems (ICIAS), 2010 International Conference on
Conference_Location :
Kuala Lumpur, Malaysia
Print_ISBN :
978-1-4244-6623-8
DOI :
10.1109/ICIAS.2010.5716195
