The development trend of professional wireless communication technology

Radios are the earliest wireless mobile communication devices used by humans, and they have been used as early as the 1930s. So, with the rapid development of mobile communication technology, what trends may radio intercoms show in the future?

Radios are the earliest wireless mobile communication devices used by humans, and they have been used as early as the 1930s. The mobile communication system can be divided into analog and digital according to the nature of the signal; it can be divided into frequency modulation, phase modulation and amplitude modulation according to the modulation method.
In 1936, the first AM radio receiver for vehicles was launched. In 1940, the first handheld two-way radio AM radio with a weight of 2.2 kg was successfully developed. In 1941, the first two-way FM wireless communication series was commercialized. The distance is longer, the noise is smaller, and it has more advantages than amplitude modulation equipment. After decades of development, the application of radios has become very common. It has moved from specialization to ordinary consumption, and expanded from military to civilian use. Every year, the number of new terminals in the world exceeds 10 million, and the output value exceeds 10 billion US dollars.

The reason for the rapid development of wireless mobile communication services is that it meets people's desire to communicate with any individual at any time and any place. Mobile communication is the only way to realize the ideal personal communication service in the future. Under the combined effect of information support technology, market competition and demand, the development of mobile communication technology is advancing by leaps and bounds, showing the following major trends: the upgrade of analog technology to digital technology, the integration of narrowband and broadband digital technology, and more efficient use of spectrum resources. Provide comprehensive application mobile communication solutions.

Upgrade from analog technology to digital technology

The upgrade of professional wireless communication technology from analog to digital is the main trend of industry technology development. Digital technology has obvious advantages over analog technology in many aspects such as voice quality, communication security, spectrum efficiency, and service feature richness. With the popularization of professional wireless communication equipment applications, the problem of shortage of frequency resources will become more prominent, and the needs of users will continue to increase. Mid- to high-end customers in the industry will increasingly use digital products. Digital walkie-talkies are not a simple replacement for analog walkie-talkies. Their digital encryption technology and data transmission capabilities will help users to increase productivity more effectively. On the other hand, the digitization of professional wireless communication technology is a gradual process as a whole, mainly due to the maturity of analog product technology and price advantages, which still have obvious appeal to industrial and commercial users and public utility users in developing countries.

Narrowband and broadband digital technology integration

The development of user business requirements drives the convergence of digital broadband and narrowband technologies. User business needs have evolved from voice scheduling and short data transmission to image transmission and database access. Existing narrow-band digital communication systems can no longer meet high-speed data and video transmission requirements, and must rely on broadband communication systems. However, in the field of professional communications, there are some inherent defects in broadband systems. For example, broadband systems need to use cell coverage in order to solve the problem of frequency reuse, which leads to a significant increase in system cost compared to large-area systems, and a decrease in system reliability. In an emergency It is also impossible to build an emergency communication network with a large coverage in a short time. Therefore, combining the existing narrow-band trunking communication system and broadband access system to form a multimedia trunking fusion network integrating voice, data, image, and video, which can better meet the needs of industry users and will also be the next-generation digital trunking The main direction of system technology evolution.

More efficient use of spectrum resources

Radio frequency is a precious resource. With the rapid development of mobile communications, the contradiction between the limited spectrum resources and the rapid increase in wireless communication users has become more and more acute, and the phenomenon of "serious shortage of frequencies" has appeared. The way to solve the problem of frequency congestion is to use various frequency effective utilization technologies. Compared with analogue FM radios, digital radios can effectively improve spectrum utilization efficiency, and a variety of technical systems have emerged, mainly including DMR, dPMR, TETRA, APCO25 and Iden, and other digital radio standards, which reduces the channel interval from 25KHz to 6.25KHz or It is equivalent to 6.25KHz, and the spectrum utilization rate is increased by four times. This solution to solve the frequency congestion has long-term significance.

At the same time, some countries and regions are actively formulating laws, regulations, and policies to guide radio users to purchase and use systems and equipment with improved spectrum utilization efficiency. For China, the United States, Japan, etc., where spectrum resources are seriously strained, the corresponding radio management departments have also proposed specific handover schedules.

Only by increasing the utilization of spectrum resources and greatly increasing the system capacity can we better meet the development requirements of future wireless mobile communications.

Provide comprehensive application mobile radio communication solutions

In recent years, the demands of industry users for private network communications have not only been "audible", but also include "visible" and "efficient command". The original single voice communication product can no longer meet its requirements. Customers need integrated communication solutions that include voice, data and video services, and require seamless integration of professional communication systems with their internal management systems. In order to adapt to changes in customer requirements, the professional communications industry needs to integrate a large number of other technologies, showing a comprehensive feature. For example, the public security visual command and dispatch system integrates various technologies such as voice, GPS, and GIS.

The process of digitization, clustering and multi-mode of communication technology accelerates the comprehensive information transmission capability of voice, image and data possessed by digital walkie-talkies. With the customized application software, the communication and working system of the mobile work team can be integrated and greatly improved Work efficiency. Whether it is in government or business, this kind of mobile communication solution tailored for different mobile work teams will become a new trend.