Application of adaptive array antennas to radio communications

Abstract

Introductions of dynamic control of the systems are expected for mobile communications in time, space, and frequency domains. The adaptive antenna is effective for control in space. The dynamic zone configuration will be a new application area in which, depending on the distributions of the users, the zone shape is varied.

The Impact of Using Multiple Antennas on Wireless Localization

“…Finally, there has been a wide range of research covering development of antennas suitable for mobile communications systems, and many experimental results have been reported to show the system requirements and feasibility. An application of phased-array and adaptive antennas has been suggested in recent years for mobile communications to overcome the problems of single-antenna systems [10], [11], [12], [13], [14], [15], [16], [17]. Specifically, these two types of antennas have been shown to help improve a mobile system's performance in several ways, such as by increasing channel capacity and spectrum efficiency, extending range coverage, reducing cochannel interference and multipath fading.…”

Efficient Radio Transmission with Adaptive and Distributed Beamforming for Intelligent WiMAX

“…In the receive mode, it can also perform optimal combining after delay compensation of the incoming multipath signals [4]. According to [5], an M-element adaptive array and a multi-beam antenna provide an M-fold increase in antenna gain.…”

Applications Of Antenna Arrays To Mobile Communications, Part I: Performance Improvement, Feasibility, And System Considerations

“…Without the use of an array, this is accomplished by having a separate base station for each cell and keeping cell size fixed, whereas using space diversity, the shape of a cell may be changed dynamically to reflect the user movement. Thus, an array of antennas creates an extra dimension in this arrangement by providing dynamic control in space [20].…”

“…b) Formation of adaptive beams: An array of antennas with the capability to form independent beams may be used at the base station as discussed in [20], [70], and [71]. The array is used to find the location of each mobile, and then beams are formed to cover different mobiles or groups of mobiles.…”

“…Instead of having cells of fixed size, the use of array antennas allows the formation of a cell based upon traffic needs, as shown in Fig. 7 [20].…”