MODIFIED CLIPPING AND FILTERING TECHNIQUE FOR PEAK-TO-AVERAGE POWER RATIO REDUCTION OF OFDM SIGNALS USED IN WLAN.

摘要

Orthogonal Frequency Division Multiplexing (OFDM) has several attributes which make it a preferred modulation scheme for high speed wireless communication. However, the increased Peak-to-Average Power Ratio (PAPR) of the signal is a significant drawback for OFDM systems since it restricts the efficiency of the transmitter. This paper is focused in the domain of PAPR reduction of OFDM signals. The main idea is to use a combination of data interleaving with clipping and filtering and use of optimum clipping ratio (?) in order to increase the overall performance of the system and the PAPR and BER is evaluated in AWGN channel. The main advantage of the proposed combination lies in reducing PAPR and significantly reduction in BER in the presence of AWGN channel.