Smart antennas

Smart antennas have received increasing interest for improving the performance of wireless radio systems. These systems of antennas include a large number of techniques that attempt to enhance the received signal, suppress all interfering signals, and increase capacity, in general. The main purpose of this article is to provide an overview of the current state of research in the area of smart antennas, and to describe how they can be used in wireless systems. Thus, this article provides a basic model for determining the angle of arrival for incoming signals, the appropriate antenna beamforming, and the adaptive algorithms that are currently used for array processing. Moreover, it is shown how smart antennas, with spatial processing, can provide substantial additional improvement when used with TDMA and CDMA digital-communication systems. The material presented is tutorial in nature, leaving the details for further study from the papers appearing in the reference list.

[1]  Michael Georgiopoulos,et al.  Performance of radial-basis function networks for direction of arrival estimation with antenna arrays , 1997 .

[2]  Robert Schreiber,et al.  Implementation of adaptive array algorithms , 1986, IEEE Trans. Acoust. Speech Signal Process..

[3]  Hideki Imai,et al.  Adaptive Array Antenna Based on Spatial Spectral Estimation Using Maximum Entropy Method (Special Issue on Adaptive Signal Processing in Mobile Radio Communications) , 1994 .

[4]  L. Godara.  Application of antenna arrays to mobile communications. II. Beam-forming and direction-of-arrival considerations , 1997, Proc. IEEE.

[5]  Richard D. Gitlin,et al.  The impact of antenna diversity on the capacity of wireless communication systems , 1994, IEEE Trans. Commun..

[6]  Christos G. Christodoulou,et al.  Neural network-based adaptive beamforming for one- and two-dimensional antenna arrays , 1998 .

[7]  R. O. Schmidt,et al.  Multiple emitter location and signal Parameter estimation , 1986 .

[8]  Bernard Mulgrew,et al.  Smart antenna arrays for CDMA systems , 1996, IEEE Wirel. Commun..

[9]  João Schwarz Dasilva,et al.  The European research program for advanced mobile systems , 1995, IEEE Wirel. Commun..

[10]  Seungwon Choi,et al.  Adaptive antenna array utilizing the conjugate gradient method for multipath mobile communication , 1992, Signal Process..

[11]  Jack H. Winters,et al.  Smart antennas for wireless systems , 1998, IEEE Wirel. Commun..

[12]  Nelson Sollenberger,et al.  The evolution of IS-136 TDMA for third-generation wireless services , 1999, IEEE Wirel. Commun..

[13]  Ryuji Kohno.  Spatial and temporal communication theory using adaptive antenna array , 1998, IEEE Wirel. Commun..