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Digital intercommunication and long-range telecommunication realization by transit

A digital walkie-talkie, long-distance communication technology, which is applied in the communication between multiple stations, radio relay systems, etc., can solve the limitation of the size of portable walkie-talkie user equipment, the limited communication distance of analog/digital walkie-talkies, and the inability to achieve normal performance indicators and other issues, to achieve the effect of realizing equipment performance, promoting application, and extending battery life.

Inactive Publication Date: 2008-07-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing digital walkie-talkies and analog walkie-talkies have common disadvantages: because they are powered by limited power sources such as batteries, and are limited by the national standard on the transmission power of wireless walkie-talkies, and due to indicators such as portability, the size of the walkie-talkie user equipment is limited. Therefore, the communication distance between analog / digital walkie-talkies is relatively limited. In some complex electromagnetic environments, or relatively closed environments, or environments that require long-distance communication, general analog / digital walkie-talkies often cannot achieve normal performance indicators.
Compared with conventional walkie-talkie systems, these digital trunking systems are more complex and costly, and are more suitable for some high-end applications, and their core technologies are in the hands of foreign companies

Method used

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  • Digital intercommunication and long-range telecommunication realization by transit
  • Digital intercommunication and long-range telecommunication realization by transit
  • Digital intercommunication and long-range telecommunication realization by transit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] Figure 6 And Fig. 7 has shown the structure of digital walkie-talkie of the present invention, by Figure 6It can be seen that the difference between this digital walkie-talkie and the existing general digital walkie-talkie is that: a switch control circuit for automatically switching the sending and receiving state and a signal buffer storage area for storing signals are added; the switch control circuit is connected with the main control circuit, radio frequency The transceiver circuit is directly connected and controlled by the main control circuit to control the RF transceiver circuit to automatically switch between receiving and sending states; this circuit is used to control the radio frequency part of the walkie-talkie to automatically switch between sending and receiving states according to the set time slot , to adapt to the work requirements of the digital walkie-talkie system with relay function. The switch control circuit is composed of a timer and a switc...

Embodiment 2

[0042] Figure 8 It shows the multicast communication signal flow of the digital walkie-talkie with relay function, which is represented by Figure 8 It can be seen that the calling mobile station of the calling intercom writes the destination address field of the communication request message as the broadcast address, sends the message, informs the adjacent mobile station that it is about to send a broadcast call, and starts sending data packets immediately after the message; After each adjacent mobile station receives the message, it detects that the message is a broadcast call. If it is in an idle state, it immediately transfers to the receiving state and receives data packets without responding. After the broadcast call ends and the data packet transmission is completed, the calling mobile station sends a broadcast end message whose destination address field is the broadcast address, and notifies adjacent mobile stations that the broadcast call ends. After each adjacent m...

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PUM

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Abstract

The invention uses a communication protocol with transit protocol. Base on spatial distribution of intercoms, with adding several intercoms that can directly communicate to both calling intercoms and called intercoms that can not directly create communication each other, the invention builds digital relay transmission between calling intercom and called intercom.

Description

technical field [0001] The invention relates to intercom communication and signal processing technology, in particular to a digital intercom and its method for realizing long-distance communication by means of relay. Background technique [0002] At present, my country's walkie-talkie technology is mainly dominated by analog walkie-talkies, and there are a small number of digital walkie-talkie applications. There are many deficiencies in analog walkie-talkies, such as high power consumption, inability to effectively eliminate the influence of interference and noise, resulting in unsatisfactory call quality in many cases; low frequency utilization, low channel capacity; poor confidentiality, easy to be eavesdropped, etc. . By digitizing the signal processing in the analog walkie-talkie, the above-mentioned deficiencies of the analog walkie-talkie can be effectively overcome. The digital walkie-talkie uses a digital processing chip with high computing power to digitize the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04B7/14
Inventor 韦岗董皓亮陈芳炯
Owner SOUTH CHINA UNIV OF TECH
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