一种新的消除VV算法载波相位模糊的方法
A New Method for Eliminating the Carrier Phase Equivocation of VV Algorithm
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摘要: VV算法非常适用于PSK突发信号的载波同步。该算法需要对估计出来的相位进行后续处理，以消除由剩余频差引起的相位模糊、避免跳周现象。该文提出了一种新的相位后续处理方法，不但能够消除由剩余频差带来的相位模糊，而且对于由噪声引入的相位模糊仍然非常有效。相对于已有的方法，该方法大大降低了信号发生跳周的概率。计算机仿真表明，该方法具有良好的性能，适用于对MPSK突发信号的解调。
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关键词:
- VV算法;跳周;相位模糊;载波同步
Abstract: The VV algorithm is very suitable for carrier synchronization of burst signal. After VV algorithm, a post processing is needed for eliminating the phase equivocation which is brought by the residual frequency and the cycle slip can be avoided. In this paper, a new post processing method is put forward. It has a good effect on the phase equivocation brought by both residual frequency and noise. Contrast to some other methods, it reduces the probability of cycle slip greatly. Simulation results prove that this method had a good performance and can apply to the demodulation of MPSK burst signal. -
Viterbi A J, Viterbi A M. Nonlinear estimation of PSK-modulatedcarrier phase with application to burst digital transmission. IEEE Trans. on Information Theory, 1983, IT-29(4): 543551. .[2]Paden B E. A matched nonlinearity for phase estimation of a PSK-modulated carrier. IEEE Trans. on Information Theory, 1986, IT-32(3): 419.422.[3]Fitz M P. Equivocation in nonlinear digital carrier synchronizers[J].IEEE Trans. on Communications.1991, 39(11):1672-[4]郑大春，项海格. 彻底消除相位检测中的弧度跳变问题. 电子测量技术, 1996, (4): 15. -
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