Difference between 3G wireless monitoring and WIFI wireless monitoring

3G wireless monitoring

Strictly speaking, there are two methods: 2G and 3G. One is the previous 2G model test, and the other is the latest 3G model test.

1. 2G wireless monitoring transmission modes mainly include CDMA and GSM. The two models have low hardware costs, large coverage, and slow transmission speeds. The theoretical transmission rate is up to 153.6 Kbps. In actual use, the actual transmission speed is only 60-Kbps ~ 80 Kbps. Because video images must be transmitted smoothly at the minimum kbps, the speed is far below the video requirements. Therefore, few vendors choose wireless monitoring projects. Another major drawback is that the traffic fee charged by the operator is too high. A large fee is generated every month and every year. It is generally considered only when there is a certain amount of money in the case of remote Wi-Fi devices.

2, 3G wireless monitoring is the use of mobile (TD-SCDMA), telecommunications (CDMA 2000 EVDO), Unicom (WCDMA) Operator 3G technology access method, since 09 years, by the operators vigorously promote, many monitoring manufacturers have developed related products for this purpose. The outstanding advantage of 3G is its high-speed download capability. The ideal value is 3 kbps ~ 20 Mbps transmission rate, but it is still in the promotion stage, so the transmission rate remains to be further verified.

At present, 3G has the following defects: limited bandwidth, limited access users, and time extension. In the case of multi-user sharing, it is difficult to ensure the rate and latency requirements of wireless video monitoring, the main drawback is that the traffic fee charged by the operator is too high and is unacceptable to the general customer.

Wi-Fi wireless monitoring

Strictly speaking, Wi-Fi wireless monitoring is divided into two methods: analog wireless monitoring and digital wireless monitoring.

1. analog wireless monitoring is to directly modulated the video signal on a 2G or 1G wireless channel and transmit it through the antenna. The monitoring center receives the wireless signal through the antenna, then, the original video signal is obtained through the wireless receiver. This monitoring method has no compression loss and almost no latency. Therefore, it can ensure the video quality, but it is only suitable for a point-to-point close distance of less than 1KM) single-Path Transmission is not suitable for large-scale deployment.

In addition, because there is no modulation and calibration process, the anti-interference performance is poor and the frequency is low, so in the case of complicated wireless signal environment, it will produce a great deal of attention, resulting in image confusion, loss, and other situations. Therefore, it is not recommended to transmit multiple images.

2. digital wireless monitoring is to first compress the video signal encoding and modulation of 2.3G/2.4G/5.8G through digital wireless channels), and then use the antenna to launch the video. On the contrary, the receiver receives signals from the antenna, then wirelessly unexpands and decompress the video, and finally restores the analog video signal for transmission. This method is widely used in the domestic market. The scalability of digital microwave is large, and the communication capacity can be used with at least dozens of channels. The construction is relatively easy, the communication efficiency is high, and the application is flexible.

Digital wireless has the advantages of analog wireless incomparable, such as a large area of 5-30 square kilometers), monitoring points more than 5-points) need to add a relay of the situation, complex and interference sources for a long time using LP5800-WBS WIFI base station as the center and then with the base station front-end CPE equipment transmission cost-effective very high. Large digital wireless capacity, strong anti-interference ability, good confidentiality, the same transmit power transmission distance is farther, less affected by terrain or obstacles, rich interfaces, strong scalability, etc.

Of course, different wireless transmission technologies have their own application areas. For example, Wi-Fi wireless monitoring is widely used in factories, oil fields, border defense, and forests. With the improvement of 3G performance, the decrease of traffic fees, and the maturity of the network environment, and the widespread demand for large-scale wireless monitoring will also promote the further use of 3G.

Through the above introduction, we hope that you can clearly distinguish between 3G wireless and WIFI wireless and have a profound understanding.