Effect of frequency offset on BER of OFDM and single carrier systems

,Ali.sir,tciI'erformance o f bath orthogonal frequency division multiplexing (OFDM) and single carrier (SC) systems suffers Iron) a carrier frequency offset (CFO) due to Doppler effect iind the ciwrier instability between the transmitter and the receiver. \'e investigate the bi t ermr rate @ER) performance degradation of OFDhl and SC systems due to the frequency offset in a n additive white Gaussian noise ( A W G N ) channel as well as n,altip:ith fhd?kigh fading channels. W e consider three effects to the UER degradation. i.e.. pha. hilt. useful power decrease and intercai-rkr interference (ICI). W e also derive the approximate c\prcssions o f HER under hinary phase shift keying (BPSK) and qoa~ernzir? phase shift keying (QPSK) far both OFDM and SC \)stems in the presence o f CFV. In general, SC is more robust t i ) CFV in the AtVCR' channel than OFDM in terms of BER. while both of' them suffer sintihi-ly from CFO in the multipath Rayleigh fading channels assuming tlie the same CFO. i,~,/e.r 7>rm.sOFDhl. single cart-ier. channel frequency offset