What is the Difference between a Transmitter and Receiver?

The wireless network receiver is abbreviated as WLAN (Wireless Local Area Network), also known as high-power wireless network card and wireless network device. The network card is connected to the USB interface of the computer and automatically searches for a large area of nearby wireless networks to achieve wireless Internet access. The most common standards for wireless local area networks are a series of industry-defined standards.

A wireless local area network is a local area network using wireless connections. It uses radio waves as a medium for data transmission. The transmission distance is generally tens of meters. The backbone network of a wireless local area network usually uses a cable, and wireless LAN users access the wireless local area network through one or more wireless access points. ^[1]

The first version of wireless local area network was published in 1997, which defined the medium access control layer and the physical layer. The physical layer defines two wireless frequency modulation modes and an infrared transmission mode working in the 2.4GHz ISM band. The total data transmission rate is designed to be 2Mbit / s. The communication between the two devices can be performed in a free and direct manner, or under the coordination of a base station or an access point. ^[1]

Because WLAN uses the 2.4G frequency band, 2.4G signals are easily affected

Although the characteristics of WLAN receivers are the same as wireless network cards, because of their unique pertinence, WLAN receivers are also divided into many types

1.High power type

2.Low power type

The typical WLAN chipset is roughly divided into three types according to the working principle, namely super heterodyne, zero-IF and low-IF.

Our vision 10 years ago was that WLAN will replace LAN, and now our vision is that WLAN will replace LAN ". In the interview, Sima Cong: Doctor of Engineering, General Manager of Meru Networks Greater China, he said.

At present, domestic and foreign operators are vigorously promoting the coverage of WLAN, and the WLAN market will definitely require WLAN receivers. Therefore, the demand for WLAN receivers will continue to rise in the next few years, and the market prospects cannot be underestimated. ^[3]