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Fast carrier recovery system and method based on combined ring

A carrier recovery and combined loop technology, applied in the field of communications, can solve the problems of poor tracking performance, large capture range, and inability to achieve capture, and achieve the effect of high accuracy and speed improvement

Active Publication Date: 2019-10-11
FUJIAN XINGHAI COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The decision feedback algorithm and the general carrier recovery algorithm have the characteristics of small capture range and good tracking performance. The small capture range means that the capture cannot be achieved when the frequency deviation between the local carrier and the received carrier is large; the polarity judgment phase detection algorithm has a capture range The characteristics of large and poor tracking performance, poor tracking performance is that the deviation of the carrier frequency received by continuous tracking becomes larger and larger after a long time of signal reception
In the case that the required carrier recovery time is short, these carrier recovery algorithms have some defects that make them unable to meet the requirements

Method used

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  • Fast carrier recovery system and method based on combined ring
  • Fast carrier recovery system and method based on combined ring
  • Fast carrier recovery system and method based on combined ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Please refer to figure 1 Shown, embodiment one of the present invention is:

[0044] A fast carrier recovery system based on combined rings, including analog-to-digital converters, costas rings, universal carrier recovery rings, selector switches, counters and timers;

[0045] The Costas loop includes a first multiplier, two first low-pass filters, a first phase detector and a first loop filter, and the general carrier recovery loop includes a second multiplier, two second A low-pass filter, a second phase detector and a second loop filter, the Costas loop and the universal carrier recovery loop share a numerically controlled oscillator, and the selection switch includes a first selection switch and a second selection switch switch;

[0046] The output terminal of the first multiplier is respectively connected with the input terminal of a first low-pass filter in the two first low-pass filters and the input terminal of a second low-pass filter in the two second low-pa...

Embodiment 2

[0049] Please refer to Figure 2 to Figure 5 Shown, embodiment two of the present invention is:

[0050] A recovery method based on a combined ring fast carrier recovery system comprises the following steps:

[0051] S1, such as image 3 As shown, a first pulse data with a first number of characters (300 characters) is preset and the first pulse data is transmitted, and the first pulse data includes synchronous headers and synchronous data arranged continuously in sequence, so The sync header includes single carrier data with a second number of characters (30 characters) arranged continuously in sequence, first fixed data with a third number of characters (23 characters) for bit synchronization, and data with a third number of characters (23 characters) for frame synchronization. The second fixed data of the fourth number of characters (7 characters), the number of characters of the synchronization data is the fifth number of characters (240 characters);

[0052] Figure 4...

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Abstract

The invention relates to the technical field of communication and particularly relates to a rapid carrier recovery system and method based on a combined ring. A fast carrier recovery system based on the combined ring comprises a Costas ring, a general carrier recovery ring and a selection switch. The Costas ring and the universal carrier recovery ring form the combined ring. According to the fastcarrier recovery method based on the combined ring, a section of pulse data of which the frame structure consists of a synchronization head and synchronization data is preset. The synchronization headcomprises single carrier data and fixed data. The carrier recovery system combining a Costas loop and a universal carrier recovery loop is used for capturing and tracking pulse data. Carrier recoveryrate is improved, rapid carrier recovery is achieved, it is guaranteed that the frequency deviation after carrier recovery cannot be increased along with increase of the working time, and the requirement for high carrier recovery accuracy in short carrier recovery time is met.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a combined ring-based fast carrier recovery system and method. Background technique [0002] In the system of short-term data pulse transmission realized by quadrature amplitude modulation (QAM), the carrier recovery speed of the coherent demodulation system is a key index to evaluate the quality of the coherent demodulation system. The carrier recovery algorithms of quadrature amplitude modulation (QAM) generally include decision feedback algorithm, general carrier recovery algorithm and polarity decision phase detection algorithm. The decision feedback algorithm and the general carrier recovery algorithm have the characteristics of small capture range and good tracking performance. The small capture range means that when the frequency deviation between the local carrier and the received carrier is large, the capture cannot be achieved; the polarity judgment phase detectio...

Claims

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Application Information

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IPC IPC(8): H04L27/38
CPCH04L27/3818
Inventor 张晶骋吴志聪兰茂利张劼慧倪宇峰
Owner FUJIAN XINGHAI COMM TECH
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