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Performance Analysis of p/4 DQPSK for FrFT-OFDM System with Carrier Frequency Offset |
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PP: 1383-1389 |
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Author(s) |
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Ankush Kansal,
Kulbir Singh,
Rajiv Saxena,
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Abstract |
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| The Orthogonal Frequency Division Multiplexing (OFDM) has widely been used in broadband wireless communication
due to its ability to efficiently utilize the spectrum with multicarrier communication. In this paper BER expression for p/4 DQPSK
modulation has been derived from FrFT based OFDM system in the presence of carrier frequency offset (CFO) under frequency
selective Rayleigh fading channel. The performance of proposed system has been evaluated and compared with the FFT based OFDM
system. It is found that the FrFT based OFDMsystem outperforms the FFT based OFDM. BER analysis has also been done for various
values of a (FrFT angle parameter) on said FrFT based OFDM system, however the system responds best at a = 0.9 as compared with
other values of a. Improvement as high as up to 23 dB in SNR has been achieved with the proposed FrFT based OFDM system at a =
0.9 for said modulation with carrier frequency offset of 0.1 under frequency selective Rayleigh fading channel. |
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