Mobility

Quantifying an Iterative Clipping and Filtering Technique for Reducing PAR in OFDM

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Executive Summary

In Orthogonal Frequency Division Multiplexing, a simple clipping method is widely used in order to reduce the peak-to-average power ratio since it is easy to implement. The performance analysis of the clipping approach has been previously introduced in the literature. Clipping, however, is a nonlinear process and may cause two major undesirable effects: spectral regrowth, which causes unacceptable out-of-band radiation; and distortion of the desired signal, which increases Bit-Error-Rate (BER). The out-of-band radiation can and often is suppressed by filtering, which leads to peak regrowth. Therefore, iterative clipping and filtering is required until the desired clipping level is achieved.

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