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EBPSK Demodulation Analysis Based on Second-order Phase Locked Loop |
Qi Chen-hao; Chen Guo-qiang; Wu Le-nan |
School of Information Science and Engineering, Southeast University, Nanjing 210096, China |
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Abstract High efficiency modulation and demodulation techniques are significant for data transmission. Based on present EBPSK transmission system, a kind of demodulation method that employs a second-order PLL with its PD output structure is discussed in the paper. Firstly, PLL linear model is established in order for the comparative analysis between phase step error response and phase rectangular-pulse error response under different damping ratio. The ideal PD waveform expression is figured out. And then in case of narrow bandwidth Gauss noise condition, an optimal integral length for EBPSK demodulation is explored, with its corresponding simulation results. Finally it is demonstrated by simulations that, once PLL is capable of retrieving tracking state from capturing state in some SNR condition, effective EBPSK demodulation is available.
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Received: 15 August 2007
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