Carrier phase error extraction system applied to MAPSK modulation

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.

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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Problems solved by technology

Since MPSK / MAPSK has a large number of signal points, and the distance between constellation points is small, and it is divided into multiple circles (MPSK only has outer circles), this brings great difficulties to the engineering realization of residual carrier phase error extraction. At present, there is no The relevant technical team has a good solution to this difficulty

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