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3G antenna and WIFI antenna What is the essential difference
Jun 27, 2017

3G antenna

1,2G wireless monitoring transmission method mainly includes CDMA, GSM two forms. These two forms of hardware cost is low, coverage, transmission speed is slow, the theoretical value of the transmission rate of up to 153.6Kbps, in the actual application of only reached 60 ~ 80Kbps. As the video at the end of the request 512Kbps in order to circulation, this speed is far less than the video request. Therefore, in the wireless monitoring project, very few manufacturers to choose. Another biggest flaw is that the operator charges a fee that is too high, and every month, every year, there will be a lot of money. Usually as long as the very remote, WIFI wireless equipment can not do the case, and there will be a certain amount of funds will be considered.

2,3G wireless monitoring is the use of mobile (TD-SCDMA), telecommunications (CDMA2000 EVDO), China Unicom (WCDMA) operators 3G skills access method, since 2009, the operators vigorously, there are many monitoring Manufacturers for the development of related products in this regard. The outstanding advantages of 3G, that is, high-speed download capability, aspiring value can reach 3Kbps ~ 20Mbps transfer rate, but now because it is still in the implementation period, and thus in the transmission rate of this aspect remains to be further research.

WIFI Antenna:

3G now there is limited capacity of wireless bandwidth, access users limited, when the extension and other defects in the case of multi-user sharing, it is difficult to ensure that the wireless video surveillance rate and delay requests, the primary defect or the operator to charge the traffic fee is too high , Usually the customer can not afford.

1, imitate the wireless monitoring that is directly modulated by the video signal in the 2.4G or 1G wireless channel, launched through the antenna, the monitoring base through the antenna to accept wireless signals, and then through the wireless receiver to demodulate the original video signal, this The monitoring method does not have a tightening loss, and no delay occurs, so it can ensure the video quality, but it is only suitable for point-to-point spacing (within 1KM) single transmission, inappropriate size layout.

In addition, because there is no modulation and calibration process, anti-interference is poor, the frequency is small, so the wireless signal environment in the case of chaos itself will be very disturbing, the formation of picture disorder, lost and so on. So in the case of multiple pictures to be transmitted, do not advocate the use of this method of transmission.

2, digital wireless monitoring is the first video signal compression, after digital wireless channel modulation (2.3G / 2.4G / 5.8G, etc.), and then use the antenna to launch out. The receiver side is the opposite, by the antenna to accept the signal, followed by wireless despreading and video decompression, and ultimately reduced to imitate the video signal transmission out, this method is now more use of the domestic market. Digital microwave scalability, communication capacity can be used at least dozens of channels, and the construction is relatively easy, higher communication power, the use of flexible.

Digital wireless has to imitate the wireless incomparable strengths, such as a large area (5-30 square kilometers), monitoring points (5-500 points) need to relay the situation, the situation is chaotic and disturbed source for a long time use LP5800-WBS WIFI base station for base re-cooperation base station front-end CPE device method transmission cost is very high. Digital wireless capacity, anti-interference ability, good confidentiality, the same transmission power transmission interval farther, less affected by terrain or obstacles, rich interface, strong expansion and so on.

Of course, different wireless transmission skills have their own applicable occasions. Such as in the factory, oil field, border, forest, etc., the choice of WIFI wireless monitoring more, followed by various aspects of 3G features to enhance the flow of the cost reduction, network environment, and a wide range of wireless monitoring throughout the demand, The further use