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Reliable frame synchronizing technology in data communication

A technology of data communication and frame synchronization, which is applied in the field of electrical communication, can solve problems such as difficult acquisition and frame synchronization technology, and achieve the effect of large fault tolerance, less resources, and improved quality

Inactive Publication Date: 2004-06-30
NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And such frame synchronization technology is difficult to obtain from the existing technology

Method used

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  • Reliable frame synchronizing technology in data communication
  • Reliable frame synchronizing technology in data communication
  • Reliable frame synchronizing technology in data communication

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Embodiment Construction

[0022] Accompanying drawing is also embodiment. In this embodiment, the synchronization code is formed by a group of 7-bit Barker codes 1110010 with the characteristics of a sharp autocorrelation function, and each group is composed of m (m is an odd number) Barker codes. In the way of centralized insertion, a frame synchronization code group is inserted in front of each data frame. Such as figure 2 As shown, among them, M is the synchronous code group, and U is the start word of the data frame. In order to facilitate the processing of the receiving end, the 7-bit Barker code is expanded into an 8-bit code word B, 01110010, and the inverse code of the start word is B is modulated and sent to the upper channel. Serial-to-parallel conversion is performed at the receiving end, and the data after serial-to-parallel conversion enters the frame synchronization judgment module. The frame synchronization judgment module is a software module that uses a large number of judgments to ...

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Abstract

Using corrective grouping bit sequence output from demodulator, the invented technique is completed through decision module in frame synchronization. Synchronous code is composed of 7 bits barker code. Data at sending end are sent according to frame. Frame synchronization code group and data frame start-up word are inserted in front of each data frame, which is modulated and then sent to channel. Serial-parallel conversion is carried out at receiving end. Hardware sends each word received at the receiving end to decision module in frame synchronization for further processing. The decision module in frame synchronization is controlled by specific mathematic mode. The invention combines hardware with software, providing features of simple circuit, reliable synchronization, small program size and less resources needed. Good fault tolerant capability is kept under low S / N ratio. It is easy to modify and upgrade software. Thus, the invention raises quality and security greatly.

Description

technical field [0001] The invention relates to the technology of electric communication, especially the technology of radio data communication, especially the reliable frame synchronization technology of mobile data communication. Background technique [0002] Frame synchronization is applied in various types of communication networks. There are many frame synchronization technologies, but most of them are formulated for the better transmission conditions. In the case of relatively good transmission conditions, the processing of frame synchronization is relatively simple, and the receiver can realize frame synchronization very quickly. However, it is difficult to guarantee the reliability of frame synchronization when the channel condition is poor. Although the establishment of the frame synchronization of the main components takes into account a certain channel bit error rate, if the system's fault tolerance is to be increased, the hardware implementation will become very...

Claims

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Application Information

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IPC IPC(8): H04W28/02H04B7/26
Inventor 姜永广曾浩洋
Owner NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
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