A method for analyzing the carrier phase tracking principle of the Matsuo ring using the vector method

Abstract

The invention provides a method for analyzing the carrier phase tracking principle of the pine tail ring by using the vector method, including establishing a vector rectangular coordinate system; using a rotating vector to represent the external input signal, which is recorded as an input rotating vector; using two orthogonal rotating vectors to represent The two orthogonal carriers recovered locally are recorded as the orthogonal rotation vectors recovered locally; the projection of the input rotation vector on the orthogonal rotation vector recovered locally is used as the correlation between the external input signal and the two orthogonal carriers recovered locally In accordance with the principle analysis method of mathematical derivation, the output frequency of the voltage-controlled oscillator changes with the in-phase and quadrature correlation; the external input signal frequency and the VCO output frequency of the voltage-controlled oscillator VCO are related to the rotation speed of the rotation vector to associate. The invention can intuitively and simply form the local carrier synchronization and tracking principle about the "pine tail ring", and help to better develop a 4-phase PSK signal demodulator that meets various needs.

Description

technical field [0001] The invention relates to the technical field of carrier phase tracking of a pine tail ring, in particular to a method for analyzing the principle of carrier phase tracking of a pine tail ring using a vector method. Background technique [0002] Quadrature Phase Shift Keying (QPSK) is a modulation method with excellent performance and widely used in modern digital mobile communications. Its frequency band utilization rate is high, which is twice that of Binary Phase Shift Keying (BPSK); the bit error rate index is good, and the bit error rate is the same as that of BPSK under the same signal strength during coherent detection. However, there are also problems that the signal is greatly affected by fast fading and Doppler effect, and the coherent carrier is particularly difficult to track. [0003] In order to solve the problem that the coherent carrier is difficult to track, the Costas ring or the deformed ring of the Costas ring—the pine tail ring (he...

AI Technical Summary

Problems solved by technology

[0012] The disadvantages of the above methods are that the descriptions in 1) to 4) and 6) are all mathematical descriptions, and the meanings are relatively abstract and obscure. There is a certain distance from the usual principle analysis, which is often described in concise and intuitive words.

In addition, how VCO frequency changes lead to tracking cannot be visually explained

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