1. Network coverage

For wireless base stations using ordinary antennas, the coverage of their cells is completely determined by the radiation pattern of the antenna. After installation on site, unless the antenna is replaced, its radiation pattern is impossible to change and difficult to adjust. The radiation pattern of the smart antenna array is completely controllable. When adjustment is required, the network can be simply optimized through software, reducing manual participation.

2. Increase system capacity and suppress interference

The CDMA system is a self-interference system, and its capacity is mainly limited by the interference of the system. Smart antennas adjust the excitation of each antenna element, optimize the antenna array pattern to align the zero point with the interference direction, greatly improve the output signal-to-interference ratio of the array, suppress interference, and play a role in improving system quality and reliability. The improvement of the signal-to-interference ratio also means an increase in system capacity. Smart antennas increase the space division effect, which is theoretically equivalent to increasing the capacity of the wireless network. When there are fewer users, the gain of the space division is more obvious, and when there are too many users, its performance will decrease.

3. Improve the sensitivity of the base station receiver

The signal received by the base station is the sum of the signals received by each antenna unit and the receiver. If the maximum power combination algorithm is used, ignoring multipath propagation conditions, the total received signal will increase by 10lgN (dB), where N is the number of antenna units. When multipath exists, the improvement in receiving sensitivity will vary with multipath propagation conditions and uplink beamforming algorithms, and the result is also around 10lgN (dB).