احمد کشاورز

‎Orthogonal Frequency Division Multiplexing(OFDM) has attracted the attentions as an efficient modulation for wireless communications‎. ‎Along with its many advantages‎, ‎one the problems of OFDM is high Peak to Average Power Ratio(PAPR)‎. ‎A variety of methods have been proposed to reduce PAPR‎. ‎In this thesis‎, ‎systematic and non-systematic BCH codes are used to reduce PAPR‎. ‎these codes at the same times serve as error correction codes as well‎. ‎The analyses and simulations show that with negligible data rate reduction‎, ‎these code achieve good PAPRs‎. ‎Non-systematic codes are designed in polynomial or frequency domain‎. ‎While all the BCH codes with the same length and rate have the same error correction capability‎, ‎the non-systematic ones designed in frequency domain have the best PAPR‎. ‎We used the BCH codes over long field GF(2^16). Our motivation to use these codes was that long BCH codes cocatenated with LDPCs serve as error correction codes in DVB-T2 systems‎. ‎Therefore the proposed techniques in this work can be fruitful for DVB-T2 with small modification in transmitter and receiver‎.