| Peak-to-average-ratio has been major issue in the implementation of orthogonal frequency division multiplexing systems in low cost application devices. In this paper, we propose an peak-to-average-ratio reduction technique which uses channel coding especially expurgated codes. Many solution has been proposed to control PAPR in OFDM. Solutions such us amplitude clipping and filtering, coding, partial transmit sequence, selected mapping, etc,. The use of coding for PAPR was brilliant and was first realized by Barton. Coding theory is a well established field of mathematics and computer science and has been extensively used in communications engineering since shannon showed that improvement in BER can be achieved by use of channel coding. We use coding theory to suggest a simple but effective algorithm to control PAPR in OFDM systems. This method combines the error correction capability of channel encoder and it achieve PAPR reduction in OFDM system. Our technique is easily implemented in terms of encoding as well as decoding. We shall discuss the trade-offs involved in our method. |