The principle of smart antenna is to lead the signal of radio to a specific direction causing space directional beam, and makes the main beam of antenna aim at the direction of user’s signal to take fully use of mobile signal and delete or restrain signal. At the same time,5.8 ghz antenna takes advantage of the difference between the features of user’s signal space. Receive and launch more than one signal in the same signal channel by array antenna technology without mutual interference, which makes the signal transmission and radio-frequency spectrum more efficient.
Brief introduction of smart antenna
At the beginning, it is used in the fields, such as radar, acoustic susceptance and military communication. In recent years, with the rapid development of modern digital signal dealing technology, the improvement of DSP chip’s dealing capacity and the reducing of chip’s price, it is reasonable to form antenna beam in base band by taking advantage of digital technology and make the technology of smart antenna widely use in wireless communication. Because mobile WIFI antenna can improve system’s property and volume, in addition, it can advance the flexibility of antenna, and almost all the advanced mobile communication system will use this technology in the future. In the mobile communication system, antenna plays an important role in launching and receiving space electromagnetic wave, and its property directly affects the property of mobile communication system. Smart antenna system has the ability to improve the volume and quality of mobile communication and reduce interference. Smart antenna takes advanced technology to lead the signal of wireless to some specific direction making full use of radio-frequency spectrum and signal. The so-called advanced technology mainly refers to switches beam technology and adaptive space digital processing technology.
The core of smart antenna
In the part of digital signal treat, it will depend on some rules to make antenna array produce directional beam and adjust coefficient automatically to get spatial filtering. The two main problems should to be solved are to distinguish the direction of signal and digital informs. The smart antenna of TD-SCDMA uses a circle antenna array, and it is made of the 8 totally same antennas. The function of smart antenna is achieved by antenna array and the signal treat part of its connecting on baseband digital signal. The radiation pattern of base elevation direction of smart antenna is the same with every antenna element. In order to eliminate interference, we can set zero point in the interference position in the process of beam forming.
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