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A demodulation method and system for dynamic threshold judgment based on qpsk modulation with frame synchronization code implicit in information code

A frame synchronization code and dynamic threshold technology, which is applied in the modulation carrier system, transmission system, digital transmission system, etc., can solve the problems of poor bit error rate performance, achieve low bit error rate, expand the application market, and improve channel utilization Effect

Active Publication Date: 2022-01-04
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

The frame synchronization code is implicitly transmitted in the information code to improve the utilization rate of channel resources; in the demodulation, the information of the frame synchronization code is fully utilized to dynamically adjust the judgment threshold, which solves the problem of poor bit error rate performance when judging under a fixed threshold The problem

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  • A demodulation method and system for dynamic threshold judgment based on qpsk modulation with frame synchronization code implicit in information code
  • A demodulation method and system for dynamic threshold judgment based on qpsk modulation with frame synchronization code implicit in information code
  • A demodulation method and system for dynamic threshold judgment based on qpsk modulation with frame synchronization code implicit in information code

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[0046] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0047] The present invention is a demodulation method based on the dynamic threshold judgment of QPSK modulation where the frame synchronization code is implicit in the information code, and is used to realize the demodulation of the two-stage QPSK modulation scheme of the frame synchronization code and the information code, and the frame synchronization code is implicit in the information code. The QPSK modulation of the code can be regarded as two steps when the transmitting end performs signal modulation. The first step is the information sequence to determine the specific quadrant, and the second step is the synchronization sequence to control the specific position in each quadrant. That is, the I and Q signals controlled by the synchronizatio...

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Abstract

The present invention is a demodulation method and system based on the dynamic threshold judgment of QPSK modulation that the frame synchronization code is implicit in the information code, which is different from the fixed format of the synchronization symbol plus the data symbol of the traditional data frame. Sequencing is implicit in the modulation and demodulation process. When modulating at the sending end, the amplitude of the signal is modulated by using the synchronization code sequence, so that the synchronization code sequence is implied in the information sequence. When demodulating at the receiving end, the signal corresponding to the synchronization code sequence is extracted from the received signal, and the method of correlation detection can be used to realize the frame synchronization of the system. After the synchronization is achieved, the received signal is coherently demodulated, and a dynamic threshold judgment The method makes a judgment and restores the original information bits. The transmission rate of the system is improved by embedding the frame synchronization code in the modulation, and the dynamic threshold judgment is used in the demodulation to improve the bit error rate performance of the demodulation.

Description

technical field [0001] The present invention is a demodulation method and system for dynamic threshold judgment based on frame synchronization code implicit in QPSK modulation of information code, which belongs to the technical field of wireless communication, and relates to a method for efficient transmission and demodulation of information code, and the specific content is frame synchronization code The dynamic threshold judgment method of QPSK modulation implicit in the information code ensures that the transmission system achieves a lower bit error rate and improves the reliability of communication. Background technique [0002] In a digital time division multiplex communication system, in order to correctly separate the signals of each time slot, the start mark of each frame must be provided at the sending end, and the process of detecting and obtaining this mark at the receiving end is called frame synchronization. There are two types of frame synchronization: start-st...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/227H04J3/06
CPCH04L27/2273H04J3/0608
Inventor 张旭姚如贵刘攀左晓亚李加洪宋豆豆
Owner XIAN INSTITUE OF SPACE RADIO TECH
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