Abstract
A phase-switch quadrature phase shift keying (PS-QPSK) modulation scheme is proposed for the radio-over-fiber (ROF) transmission system. In the downlink, the 60 GHz mm wave modulated by QPSK is generated by heterodyne detection. Systems implement compensation of chromatic dispersion with blind equalizations in the time domain and synchronization with the training sequence. The performance of the systems is evaluated in terms of constellation diagrams, bit error rate diagrams, and error vector magnitude. The effect of nonlinear crosstalk, in-phase/quadrature (IQ) mismatch of transmitter (Tx) and receiver (Rx) are taken into account in the performance evaluation. The PS-QPSK mechanism is analyzed comprehensively and systematically in an ROF system. In addition, the performance of the proposed system is compared to that of a traditional one adopting a phase-multiplexing quadrature phase shift keying (PM-QPSK) scheme. It reveals that the PS-QPSK-ROF system has a higher tolerance to nonlinear crosstalk and IQ mismatch than a PM-QPSK-ROF system.
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