Carrier phase error extraction system applied to MAPSK modulation

A carrier phase error and extraction system technology, applied in the field of satellite communication, can solve the problems of residual carrier phase error engineering implementation difficulties, small distance between constellation points, etc., and achieve the effect of rapid product realization, simple realization and high efficiency

CN109525533AActive Publication Date: 2019-03-26SPACE STAR TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-03-26

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Abstract

The invention discloses a carrier phase error extraction system applied to MAPSK modulation and relates to the field of satellite communication. The system comprises a multiplier, a first filter, a frequency detector, a numerical control oscillator, a second filter, a phase detector and a clock recovery module. The system can be applied to both a non-data assistant scene and a data assistant scene. The system focuses on solving residual carrier phase error extraction of fine synchronization. According to the system, through utilization of a constellation characteristic of MPSK / MAPSK signals ina satellite communication system, constellation diagram simplification and segmentation are carried out on signals of different modulation modes, so complex computing of carrying out the carrier error signal extraction through direct utilization of an original constellation diagram is avoided, engineering realization flexibility is greatly improved, and rapid realization of a product is facilitated. According to the system, components related to a phase are extracted from received signals of different modes, so carrier tracking and locking are realized.
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Description

technical field

[0001] The invention relates to the field of satellite communication, in particular to a carrier phase error extraction system applied to MAPSK modulation. Background technique

[0002] In the field of broadcast communication, various coding and modulation methods and working modes are generally used. For the newly added debugging method of the satellite communication system, it is necessary to simplify the implemented algorithm simply and efficiently, so as to finally realize it as a product.

[0003] After the digital baseband signal is modulated by a high-frequency carrier, after being transmitted, the receiving end receives the high-frequency signal and converts it into a digital signal. Generally, there are the following steps. First, the high-frequency signal must be processed into a baseband signal. However, due to the difference and instability of crystal oscillators, mixers, and low-noise modules at the receiving end and the transmitting end, and th...

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Embodiment Construction

[0032] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0033] The invention provides a carrier phase error extraction system applied to MAPSK modulation, which is applied to carrier phase acquisition and tracking. By using the constellation characteristics of various MPSK / MAPSK modulation signals in the satellite communication system, the signals of different modulation methods are processed by simple multiplication, addition and subtraction, and the data approximate to the QPSK constellation distribution points are obtained, and the phase error extraction of QPSK is used Features Calculate and extract the phase error, and realize the phase error extraction of the satellite communication system signal. It simplifies the complexity of phase error extraction in the past, and can be extended to the phase error extraction problem of similar types of signals.

[0034] Such as figure 1 Shown is a schema...