Performance of the deliberate clipping with adaptive symbol selection for strictly band-limited OFDM systems

The performance of the strictly band-limited OFDM systems with deliberate c lipping is examined in terms of the peak-to-average power ratio (PAPR) and the resultant bit error performance. The clipping is performed on the OFDM signals sampled at the Nyquist rate, followed by the ideal low-pass filter, Since the low-pass filter considerably enlarges the PAPR, there is a sever e limitation in PAPR reduction capability, Thus, in order to achieve furthe r reduction of the PAPR, the application of the adaptive symbol selection s cheme is also considered, It is shown that the significant PAPR reduction w ith moderate complexity can be achieved by the combination of the clipping and the adaptive symbol selection. The price to be paid for PAPR reduction by this scheme is its performance degradation. The paper theoretically anal yzes the bit error rate performance of the OFDM system with the Nyquist-rat e clipping combined with the adaptive symbol selection, and considers the u se of the forward error correction for compensation of the degradation. It is shown that even though the clipping scheme causes severe loss in require d signal-to-noise ratio, the use of a powerful channel coding scheme such a s turbo codes significantly alleviates the bit error rate performance degra dation.