Title :
Closed form relations for ICI and BER in FRFT based OFDM system
Author :
Kumari, Smriti ; Rai, S.K. ; Kumar, Ajit ; Joshi, H.D. ; Singh, A.K. ; Saxena, R.
Author_Institution :
Dept. of ECE, Jaypee Univ. of Eng. & Technol., Guna, India
Abstract :
In this article, the mathematical relationship for Bit Error Rate (BER) and Inter Carrier Interference (ICI) Power for Fractional Fourier Transform (FRFT) based OFDM system has been derived. These expressions are derived in the presence of normalizedCarrier Frequency Offset (CFO, ε). The BER performances has been evaluated for BPSK and QPSK modulation schemes in AWGN channel at different values of FRFT angle parameter `α´. It is found thatICI power is improved by 13.82 dB for ε = 0.1 at α = 3.14 and 2.1 dB for ε = 0.18 at α = 6.28 in FRFT-OFDM system over DFT-OFDM system. For BPSK, improvement of SNR is 0.53 dB for BER 1.132 × 10-3 atε = 0.15, α = 9. 5 and 0.76 dB for BER 2.924 × 10-3atε = 0.1, α = 9.5 . For QPSK, there is SNR improvement of 6 dB forε = 0.15 at α= 6.4.
Keywords :
AWGN channels; OFDM modulation; discrete Fourier transforms; error statistics; intercarrier interference; quadrature phase shift keying; AWGN channel; BER; BPSK modulation scheme; CFO; DFT-OFDM system; FRFT; ICI; QPSK modulation scheme; bit error rate; closed form relation; gain 13.82 dB; gain 2.1 dB; intercarrier interference; noise figure 0.53 dB; noise figure 0.76 dB; noise figure 6 dB; normalized carrier frequency offset; power for fractional Fourier transform; AWGN channels; Binary phase shift keying; Bit error rate; Fourier transforms; OFDM; BER; CFO; FRFT-OFDM; ICI; OFDM;
Conference_Titel :
Advance Computing Conference (IACC), 2013 IEEE 3rd International
Conference_Location :
Ghaziabad
Print_ISBN :
978-1-4673-4527-9
DOI :
10.1109/IAdCC.2013.6514313
