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Peak-to-Average Power Ratio of Orthogonal Frequency Division Multiplexing with ICI Self-Cancellation  

Kang Seog Gen (School of Electrical and Electronic Engineering, College of Engineering, Gyeongsang National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.42, no.1, 2005 , pp. 1-8 More about this Journal
Abstract
In this paper, peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) with respect to the subchannel coding schemes for interchannel interference (ICI) self-cancellation is analyzed. It is shown theoretically and experimentally that a shaping component is generated in the transmitted sequence in the conventional correlative coding where a pair of antipodal signals is assigned in adjacent subchannels. Due to the shaping component, the signal powers in the mid and edges of a symbol are scaled by different weighting coefficients, resulting in increased PAPR. To overcome this problem a simple adjacent subchannel coding scheme is presented in this paper. In the new scheme, the shaping component caused by partial repetition of signals is eliminated by assigning a pair of signals in which phase difference varies signal-to-signal. As results, the new scheme has 2-3 dB smaller PAPR than the conventional ICI self-cancellation OFDM while maintaining much higher carrier-to-interference ratio than a normal OFDM system.
Keywords
Orthogonal frequency division multiplexing; Peak-to-average power ratio; Correlative coding; Interchannel interference;
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