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对QPSK(quadrature phase shift keying)突发传输信号在低SNR(信噪化)下,在高斯信道中传输的载波相位同步问题进行了研究。介绍了一种经典的载波同步的数据辅助算法并改进了这种算法,使之适用于低SNR情况。在FPGA(field programmable gate array)开发平台QuartusⅡ7.0上,采用VHDL(very-high-speed integrated circuit hardwarc description language)硬件描述语言实现经典算法和改进算法,并且进行了不同同步算法的性能比较.
The carrier phase synchronization problem of QPSK burst transmission in Gaussian channel under low SNR (signal noise) is studied. A classic data synchronization algorithm for carrier synchronization is introduced and the algorithm is improved to make it suitable for low SNR situations. On the FPGA (field programmable gate array) development platform QuartusⅡ7.0, VHDL is used to realize the classical algorithm and the improved algorithm, and the performances of different synchronization algorithms are compared.