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Modem based disperse pilots

A modem and scattered pilot technology, which is applied in the direction of modulated carrier system, multi-frequency code system, digital transmission system, etc., can solve the problems such as difficulty in realizing 16APSK carrier recovery and poor recovery performance, and achieve good demodulation performance and debugging work Small amount, stable and reliable performance

Active Publication Date: 2016-10-12
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional non-data-assisted methods are difficult to achieve carrier recovery for high-order modulation methods such as 16APSK, and the recovery performance is not good

Method used

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Embodiment Construction

[0015] refer to Figure 1 to Figure 2 , the present invention is based on the scattered pilot modem, including monitoring unit 1, keyboard 2, liquid crystal display 3, power supply 4, intermediate frequency unit 6 and baseband modulation and demodulation module 5, figure 1 It is a principle block diagram of the present invention, and the embodiment is according to figure 1 Connect the lines. Among them, the monitoring unit 1 input terminal 1 pin is connected with the external monitoring system input port E through the RS-485 interface, which is used to monitor and control the machine. The monitoring unit 1 input terminal 2 pin is connected with the keyboard 2 output terminal pin 1, through The key operation of the machine modifies or monitors the state of the machine, and displays it through the liquid crystal display 3 connected with the 4 pins of the monitoring unit 1 outlet. The output terminal 5 of the monitoring unit 1 is connected to the input terminal 4 of the interme...

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Abstract

The invention discloses a modem based disperse pilots, and relates to the modem technology of a communication system applying high-order modulation in the communication field. According to the modem, a frame format is improved on the basic structure of the communication system. Through addition of the disperse pilots, the carrier recovery complexity is reduced, and the carrier recovery performance of the modem is improved. The realization process of the modem is simple and effective. The modem is very suitable for the communication system applying a high-order modulation mode.

Description

technical field [0001] The invention relates to a modem based on scattered pilot frequency in the wireless communication field, and is especially suitable for being used as a modem of a communication system adopting high-order modulation in a satellite communication system. Background technique [0002] Due to the characteristics of wide coverage, long communication distance, flexible networking, and superior maneuverability, the application field of satellite communication is becoming more and more extensive. The modulation methods of satellite communication signals are flexible and variable, and common ones include BPSK, QPSK, 8PSK, 16APSK, etc. Among them, high-order modulation methods such as 16APSK have higher frequency band utilization, so they play an important role in communication systems with limited bandwidth. But what follows is the complexity of the demodulation process, especially the carrier recovery link puts forward higher requirements on the demodulator. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/38
CPCH04L27/2675H04L27/3836
Inventor 陈敬乔王赛宇李勇尚春杰孙晨华郝学坤
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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