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MAPSK self-adaptive demodulating system

A demodulation system and self-adaptive technology, applied in phase modulation carrier system, transmission system, digital transmission system, etc., can solve the problem of point deviation from the optimal point, etc., and achieve the effect of saving resources and high resource reuse rate.

Active Publication Date: 2013-11-27
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

In Document 2, the method of selecting one of five sampling points for bit synchronization will cause the selected point to deviate from the optimal point under the condition of bit timing deviation, which will have a great impact on the effect of bit synchronization, especially For 16APSK or 16QAM

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Embodiment Construction

[0028] The adaptive demodulation system and the bit synchronization part of the present invention will be further introduced below in conjunction with the accompanying drawings.

[0029] Such as figure 1 Shown is the composition diagram of the system structure of the present invention, including the lead capture module, bit synchronization module, rectangular coordinate system to polar coordinate system module, initial frequency offset and phase offset estimation module, RM decoding module, adaptive carrier tracking module, gain Control module, adaptive soft demapping module, burst type solving module and frame synchronization module;

[0030] The leading head acquisition module receives and stores the satellite downlink input signal, adopts a burst detection scheme based on multi-channel differential correlation detection, and correlates the satellite downlink input signal with the leading head; if the correlation result is greater than or equal to the capture threshold, a su...

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Abstract

The invention discloses a MAPSK self-adaptive demodulating system based on characteristics of MAPSK signals and combined with a self-adaptive data transmission frame structure. A self-adaptive signal demodulation processing flow includes the steps of descriptor header capture, bit synchronization, conversion of a rectangular coordinate system into a polar coordinate system, estimation on initial frequency offset and phase offset, RM decoding, carrier tracking, gain control, software decoding mapping, burst type solution and frame synchronization. The step of bit synchronization includes the processes of bit timing offset estimation and trigonometric function interpolation. According to the MAPSK self-adaptive demodulating system, general design for burst self-adaptive demodulation on signals with variable rates (2-45Mbps) and various modulation modes (QPSK, 8PSK and 16APSK) is achieved. The MAPSK self-adaptive demodulating system solves the problem of serious rain attenuation in wireless transmission in the Ku / Ka frequency band through a satellite, and achieves the purpose of meeting different data transmission demands of various types of communication terminals and the purpose of meeting the demand for anti-interference communication of communication satellite systems.

Description

technical field [0001] The invention relates to a MAPSK adaptive demodulation system. Background technique [0002] Satellite communication has the characteristics of wide coverage, long communication distance, large communication capacity and good transmission quality, and has become an important means of communication. Due to the increasingly busy satellite communication business and the rapid increase in communication capacity, the radio frequency spectrum is very crowded, and the mutual interference between various communication channels has become a prominent problem. In order to solve the problem of spectrum resource shortage, satellite communication is moving towards Ka(20 / 30GHz) and above high-frequency band development. Combined with the diversified requirements of communication types, the application of satellite communication systems in the Ka and above frequency bands has the following problems to be solved: 1) The serious rain attenuation problem of satellites...

Claims

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Application Information

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IPC IPC(8): H04L27/22H04L25/03H04L7/00
Inventor 田嘉惠腾飞龚险峰纪健超王战强
Owner XIAN INSTITUE OF SPACE RADIO TECH
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