adaptive antenna system (AAS)

Radio networks use a wide variety of antenna radiation techniques to ensure radio reception even under unfavorable topographical conditions. This aspect is of particular importance with wireless broadband. In addition to the Adaptive Antenna System (AAS), there is the MIMO method, which uses scatter propagation paths, and Remote Radio Head( RRH), which uses multiple radio modules.

The AAS method, which uses multiple transmit and/or receive antennas, increases the efficiency of the frequency spectrum and the coverage of the reception area. The method uses beamforming, which results in better spatial utilization of the radio transmission. With beamforming, the radiation pattern of the antenna array can be modified to optimally match the application.

Adaptive antenna system (AAS)

The radio signals of an antenna array can have different carrier frequencies, and the tilt angle of the radio lobes can be changed vertically and horizontally while simultaneously broadcasting different mobile services. These capabilities increase the range and cell size, while decreasing interference from noise sources. In terms of reception, the signal reception adapts to the direction from which the radio signals are coming. This means that the radio signal can also adapt to the movement of the mobile subscriber by changing direction.

In principle, Adaptive Antenna System (AAS) is a multi-antenna system and depending on the design, it can be Single Input Multiple Output ( SIMO), Multiple Input Single Output( MISO) or Multiple Input Multiple Output (MIMO). The AAS method is used in the GSM standard, in Wideband Code Division Multiple Access(WCDMA) and optionally applied in 802.16.