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What is the essential difference between 3G antenna and WIFI antenna
May 23, 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 use of only to reach 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 drawback 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 must be 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.

3G antenna

WIFI Antenna:

3G antenna 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 there is no delay, so it can ensure the video quality, but it is only suitable for point-to-point distance (within 1KM) single transmission, inappropriate size layout.

In addition, since there is no modulation calibration process, the anti-interference is poor, the frequency is small, so in the case of wireless signal environment chaos itself will be very disturbing, the formation of picture disorder, lost and so on. Therefore, 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 coding compression, after digital wireless channel modulation (2.3G / 2.4G / 5.8G, etc.), and then use the antenna to launch out. Acceptance 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, high communication power, the use of flexible.

Digital wireless has to imitate the advantages of wireless incomparable, 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 the base to 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, with the 3G aspects of the function of the upgrade, lower traffic costs, network environment, and a wide range of wireless monitoring throughout the demand, The further use.