一種新的消除VV算法載波相位模糊的方法
A New Method for Eliminating the Carrier Phase Equivocation of VV Algorithm
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摘要: VV算法非常適用于PSK突發(fā)信號的載波同步。該算法需要對估計出來的相位進行后續(xù)處理，以消除由剩余頻差引起的相位模糊、避免跳周現象。該文提出了一種新的相位后續(xù)處理方法，不但能夠消除由剩余頻差帶來的相位模糊，而且對于由噪聲引入的相位模糊仍然非常有效。相對于已有的方法，該方法大大降低了信號發(fā)生跳周的概率。計算機仿真表明，該方法具有良好的性能，適用于對MPSK突發(fā)信號的解調。
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關鍵詞:
- VV算法;跳周;相位模糊;載波同步
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]鄭大春，項海格. 徹底消除相位檢測中的弧度跳變問題. 電子測量技術, 1996, (4): 15. -
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