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Show allANALYSIS OF ITERATIVE RECEIVER FOR OFDM BASED ROF SYSTEMS
Abstract
In this paper the impact of a Radio-over- Fiber (RoF) optical subsystem on the sensitivity to the phasenoise of an Orthogonal Frequency Division Multiplexing (OFDM) system using Discrete Fourier Transform (DFT)and Discrete Wavelet Transform (DWT) are evaluated and compared by computer simulation. The studyinvestigates the effect of phase jitter on the system Bit Error Rate (BER) of the DFT/DWT-based OFDM fordifferent modulation schemes in the presence of optical sub-system's nonlinearities in AWGN channel. Theconventional receiver for OFDM recovers the data by subtracting the negative subframe from the positive one.However, the signal analysis shows that the signals in the two subframes both contain the information of thetransmitted data and can be used together to decode the data. An iterative receiver is then proposed to improve thetransmission performance of OFDM by exploiting the signals in both subframes. Simulation results show that theproposed iterative receiver provides significant signal to noise ratio (SNR) gain over the conventional receiver.
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References
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