Application of Wireless Bridge Technology in WLAN

Wireless network technology is a kind of network technology that we often encounter in our daily lives and work. But how can we implement the Wireless Bridge Technology in WLAN? I will give you a detailed answer here.

The Wireless Bridge Technology follows the general communication technology of the wireless LAN (w lan. WLAN uses microwave spread spectrum communication technology. The Spread Spectrum Communication Technology is short for the Spread Spectrum Communication (S pread Spectrum Com-munic atio n, its basic feature is to use pseudo-random codes that are many times higher than the transmission rate of information data to expand the spectrum of the baseband signal carrying information data, form a broadband low-power spectrum density signal to launch. Shannon, a famous information theoretical scientist in the United States, obtained the channel capacity formula: C = Wlo g 2 (1 + P/N: if the information transmission rate C remains unchanged, the bandwidth W and the signal-to-noise ratio P/N are interchangeable, that is to say, increasing the bandwidth enables reliable transmission of information at the same information transmission rate when the signal-to-noise ratio is low. Even if the signal is overwhelmed by noise, as long as the signal bandwidth is increased accordingly, it can still maintain reliable communication, that is, the benefits of signal-to-noise ratio can be exchanged with the Spread Spectrum Method for broadband transmission information. This is the basic idea and theoretical basis of spread spectrum communication.

The basic operation mode of the spread spectrum communication system. There are four basic methods to implement spread spectrum communication: (1)

Direct Sequence Spread Spectrum (D ir ect Sequence Spread Spectrum) operation mode (DSSS for short ).

(2) F requency Hoppin g (FH mode for short ).

(3) T im e Hoppin g (TH mode ).

(4) linear frequency modulation (C hir p Modula tio n) (Chir p for short ).

Currently, the most widely used method is the direct expansion (d sss), which is used in computer wireless network communication. Although a set of new technologies and new products, spread spectrum wireless networks are already a series of products with strong functions, reliable performance and compliance with specifications. It works well with a variety of common NOS systems and supports various Ethernet, licensing ring network, and TCP/IP protocols in a wide range of environments. Breeze NET DS.5 800 wireless bridges use direct-order spread spectrum technology. Working in a 5.8 GHz frequency band without the need to apply for frequency points, it uses low-cost cable connections, simple installation, fast management, and seamless connection with existing Ethernet networks, this ensures the highest cost-performance ratio. It has the following notable features:

Strong anti-interference ability

An important parameter for the Spread Spectrum Communication feature

Is the Spread Spectrum Gain G (S preadin g Gain), which is defined as the ratio of the signal bandwidth B1 before the spread spectrum to the signal bandwidth B2 after the spread spectrum, that is, G = B2/B1, in the Spread Spectrum Communication, the receiving end is connected to the received signal for the Spread Spectrum demodulation, and only the signal components whose bandwidth is B1 after the processing of the Spread Spectrum encoding are extracted, excluding the interference, noise and other user communication effects that extend to the bandwidth B2, the signal-to-noise ratio of the receiver is increased by G times. Considering the signal-to-noise ratio at the output end and the loss of the receiving system, we can consider that the signal-to-noise ratio improved by the actual spread spectrum gain is: M = G-output signal-to-noise ratio. M in the system loss formula is called the anti-interference margin. The anti-interference margin is the capability of the Spread Spectrum System to operate normally in a large interference environment. As long as the interference signal does not exceed the anti-interference margin, the system can ensure reliable signal reception.

The Wireless Bridge technology is highly concealed and has good confidentiality. DSSS

The system signal level can be completely drowned in the noise level, that is, the direct expansion system can work in the negative signal-to-noise ratio environment, so the system's transmit power can be very small, the signal is very weak, in this way, the weak spread spectrum signal is very difficult to be found, and the system uses a very special Spread Spectrum Code that is difficult to be deciphered. Therefore, the system has good concealment and confidentiality. In addition, without knowing the Spread Spectrum encoding, it is more difficult to pick up useful signals. However, extremely low power spectral density rarely interferes with other telecommunications devices.

Wireless Bridge technology is highly resistant to multi-path interference

When a radio wave encounters a variety of reflection objects, it will produce reflection and refraction waves. These reflection waves and refraction waves will cause waveform widening, waveform overlap and distortion of the original signal, which is called multi-path interference. Multi-path interference is a problem that is hard to solve in conventional communication. The direct expansion technology has a strong ability to resist multi-path interference. In wireless communication, the problem of multi-path interference resistance has always been difficult to solve, and the characteristics of Spread Spectrum coding are used; at the receiving end, we can extract and extract the strongest useful signal from the multi-path signal by using related technologies. We can also add the waveforms of the same code sequence from multiple paths to improve the performance, in this way, it can effectively resist multi-path interference.

DS.5 800 complies with IE EE802.1 1 B standard. With a speed of up to 11 Mbps and a cost-effective point-to-point network connection up to 50 km, it is the best solution for fast interconnection between buildings. Up to 50 kilometers (30 miles) of coverage, can withstand a variety of harsh environments and adverse weather effects. It is an ideal solution for connecting buildings, campuses, industrial parks, and any remote sites to ensure network connections between enterprises and the entire region. Breeze NET DS.5 800 divided into two split structures: indoor and outdoor. This design provides the best coverage and performance, and can provide the ideal high-speed connection between buildings, it provides the best service for broadband access of fixed point networks.

The Breeze NET DS.5 800 system consists of a BU-DS.5 800 Base Station unit and a RB-DS.5 800 Remote Bridge. The BU-DS.5 800 Base Station unit can be connected directly to 10 Base-tbone trunk Ethernet with a RJ-45 connector, and the central station can connect up to 128 remote bridges. The RB-DS.5 800 Remote Bridge uses a RJ-45 connector to connect directly to a 10 Base-T backbone Ethernet to connect a remote network to a central point through a Base station unit and support up to 1024 workstations.

Breeze NET DS.5 800 is a manageable system that uses SNMP for remote management. You can deploy and expand the network environment immediately according to the changes in the network environment.