Peak-to-average Power Ratio of Orthogonal Frequency Division Multiplexing

Jayalath, Dhammika & Tellambura, Chintha (2002) Peak-to-average Power Ratio of Orthogonal Frequency Division Multiplexing. Monash University.



Orthogonal frequency division multiplexing (OFDM) is successfully used in many wireless digital communication systems over multipath channels. One of the principal disadvantages of OFDM is the occurrence of high peak to average power ratios (PAR). Many PAR reduction techniques have been proposed in the literature. This report describes the PAR problem, PAR reduction methods and related issues. Performances of several PAR reduction techniques are compared. As high peaks are relatively rare, the PAR can be reduced simply by clipping high peaks. However, severe clipping introduces inband distortion and out of band radiation. Multiple signal representation techniques are effective in OFDM system with large number of subcarriers, which reduce the PAR with an increased complexity at the receiver. Although coding techniques limit the PAR 3 dB at most, coding rate is prohibitively low when number of carriers is increased beyond 32.

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ID Code: 13746
Item Type: Report
Refereed: Yes
Additional Information: The contents of this report can be freely accessed online via the publisher's web page (see hypertext link).
Additional URLs:
Keywords: OFDM, Peak Power, PAR
Subjects: Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > COMMUNICATIONS TECHNOLOGIES (100500) > Communications Technologies not elsewhere classified (100599)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2002 Monash University
Deposited On: 12 Jun 2008 00:00
Last Modified: 10 Aug 2011 17:48

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