Many people know 3G antennas and WIFI ₽♥antennas, but do you know the difference★×‍ between these two prod ♣€ucts? Today, Shenxun CommunicaΩσtion Antenna Editor will give a detailed introduc ≈&←tion to the difference between the two.

What are the differences be↑>tween 3G antenna and W±↔×IFI antenna?

1. The 2G wireless monitoring t₹φ$ransmission mode mainly includes•↓β CDMA and GSM two mod ε♦αes. The hardware cost of these two modes i±∑®¶s low, the coverage is large, and the transm×€ission speed is slow. The th β•eoretical value transmission rate i✘♠δs up to 153.6Kbps, which basically↕£↑€ only reaches 60~80Kbps in actσ×&✔ual use. Because the →∑ video image requires 512Kbps to transmit smoot ←hly, this speed is far from ♥¶ the video requirements. Therefore, few manufactu∞≥‍€rers choose to use in wireless monitoring pr εojects. Another biggest d☆λisadvantage is that the traffic fee charged ​&$₩by the operator is too high, an®←‌→d every month, every year, a large a§•∏αmount of fees will be incu£₽$rred. Generally, it will onl↔>y be considered when it is very remote, WIFφ₹I wireless equipment can≥±↓<not do it, and there is a certaδσ®in amount of funds.

2. 3G wireless monitoring adopts the 3G technolo↓εgy access method of mob" ile (TD-SCDMA), telecommunications≠₽₹↑ (CDMA2000 EVDO), and China Unicom (WCDMA) operat↓£∑βors. Since 2009, various ope™↔rators have vigorous≠§ly promoted, and there hav×→e been many monitoring Manu£>≥facturers develop related products in this reg↕'↓★ard. The outstanding advantag™><e of 3G is the high-s<₩​peed download capability. The iβ®♥deal value can reach a transmission rate o→★♦×f 3Kbps~20Mbps, but it is still ¶λ​♠in the promotion stage, so f±✘↓→urther research is needed in •✘ ÷terms of transmission r<"£ate.

3G currently has shor♠∞™tcomings such as limit¶↔ed wireless bandwidth capacity, l←♥​δimited access users, an​♣d time extension. In the case o♠₩‍πf multi-user sharing, it is difficult to guara§π¥ntee the rate and delay requirem≤‍δents of wireless video surveillance. Tγ→£πhe main disadvantage is that the t✔♠∏★raffic fee charged by the operator is too high. ♦£δ©Not acceptable to general customers.

Strictly speaking, WIFI ​↓wireless monitoring is divided into two me±☆thods: one is analog wireless <≤monitoring; the other ≈§™≥is digital wireless monitoring.

1. Analog wireless monitoring is to d ♦≤irectly modulate the video sig♣↔nal on the 2.4G or 1G wireless ch♥↕​≥annel and transmit it th¥€♥rough the antenna. The monitor✘§→φing center receives the wireless ÷∑ signal through the antenna, and then demodul©≈±✘ates the original video€≥‌ε signal through the wireless recei¥¥​ver. This kind of monitoring The metΩλλhod has no compression loss and almo↓↔st no delay, so the vi↔☆βdeo quality can be guaranteed, but it is o✔♣nly suitable for point-tδ®​o-point short-distance (within 1KM) &×"single-channel transmissi→‍≈on, not suitable for lar↔←ε'ge-scale deployment.

In addition, because there is no modulationδλγ" and calibration process, the an∑∞→∞ti-interference ability i≈×‌$s poor, and the frequency™ ≠​ points are few, so in the case of•δ the wireless signal environment is complex←©, it will produce a lot of interference, causiλ★¥÷ng image confusion, loss, etc. Therefore, w←↑≈hen there are multiple images to be tr"'δ↔ansmitted, this method is not reco‌←‌mmended.

2. Digital wireless monitoring is to≈$↓ encode and compress the video signal first, m<≈♠odulate it through the digital wire‌♣∏©less channel (2.3G/2.4G/5.8G, etc.), and the→•≈n use the antenna to transmit it. The rece÷₽&₽iving end is the oppos↕$ite. The signal is received by theδ ∞ antenna, followed by wireless despreading an§↔d video decompression, and finally restored to a♦↔‍n analog video signal for transλ'₩∞mission. This method is also more commonly ™↓λ≠used in the domestic ↓÷∑γmarket. Digital microwave is highly scalable>'∞, with at least dozens of channels availa ↕ble for communication capacity ✘δ , relatively easy to cons ↑truct, high in commu™∞≠÷nication efficiency, an'π d flexible in use.

Digital wireless has the i✔•>ncomparable advantages of a 'nalog wireless, such ✔₽as large area (5-30 sδ<‍Ωquare kilometers), many monitoring points (5-5σ∑σ00 points). There are many situations wh∞→ere relays are needed, the situat♣×ion is complicated and there are γσ<∏many interference sourcesα♥∞♣. Use LP5800-WBSWIFI The base station is t™±he center and cooperates with the ba±λ♣se station front-end CPE equip₹σment to transmit the ♣↕αcost performance is very high. Digital wirel©α₽∞ess has large capacity, stronβ×g anti-interference abi ×‍←lity, and good confid♣®"entiality. The same tr¶≠©εansmission power has a longer ♦' ​transmission distance, is less affected by terraiβΩn or obstacles, has ri∏®÷↑ch interfaces, and has strong expansion capabilit"¶↑®ies.

Of course, different wireless transmission techno&∏logies have their own applicable places<☆ €. For example, in factories, oil fields, bo©γ£✘rder defenses, forests, etc., there are‍∞ more wireless monitoring using WIFI. With∑£&← the improvement of various aspec≠₽☆§ts of 3G performance, the d&♦ ↕ecline of traffic costs, the mα♠Ωaturity of the network environment,™₹✘→ and the general demand for large-scale wir♣£∑eless monitoring will also promote≤↑∑> Further use of 3G.

The WIFI base station is tλ₩↑he center and the CPE equipment at the froγ₹nt end of the base station is very cost-ΩφΩσeffective. Digital wirel∞✘ess has large capacity, st ↕♦rong anti-interference ability, and good confiden↕$<≠tiality. The same transmission power ‌¶has a longer transmission distance"®•, is less affected by terrain o¶ r obstacles, has rich i©≥αnterfaces, and has strong expansion cap×'↕σabilities.