The last ten years have seen significant advances of multiuser MIMO (MUMIMO) in wireless communication. MU-MIMO is now being introduced in several new generation wireless standards (e.g., LTE-Advanced, 802.16m). The number of users is increasing with more and more applications. At the same time, high transmission data rates and communication reliability are required. Furthermore, there is a gro...

Antenna array design is one of the most imperative electromagnetic optimization problem of current interest. In the antenna arrays the side lobe level is main problem which causes waste of energy. In this paper, different evolutionary algorithms are presented for reduction of side lobe level in antenna array. The invasive weed optimization(IWO) algorithm outperform PSO, ACO, and GA based on met...

The large spectral occupancy of ultrawideband (UWB) wireless signals significantly complicates the design of multi-antenna arrays and the characterization of propagation channels determining the performance of such arrays. This survey paper develops generic techniques for double-directional UWB channel characterization, and surveys methods for the extraction of the parameters of multipath compo...

Godara, L. C. 1997 Application of antenna arrays to mobile communications, Part II: beam-forming and direction-of-arrival considerations, Proceedings of the IEEE, vol. 85, no. 8, 1195–1245. Bellofiore, S. , Balanis, C. A. , Foutz , J. and Spanias, A. S. 2002 Smart-antenna systems for mobile communication network, part 1, overview and antenna design, IEEE Antennas and Propagation Magazine, vol. ...

Two t>pes of active antenna elements have been studiedexperimentally One type uses a mkrostrip antenna with an active devicemounted directlv on the antenna. The other uses an active device coupledlo a microstrip patch antenna through an aperture. Microstrip activeantenna elements and two-element arrays have been demonstrated for bothtypes of circuits. Injection locking of th...

In this paper, the radiation pattern of two experimental models of circular waveguide antenna arrays on spherical surface is obtained experimentally and compared with theoretical patterns. We have omitted the phase delay of feed system signals because we have only compared measured and theoretical results in order to verify theoretical results, without trying to improve the best radiation chara...

In this paper, we are concerned with the performance at the media access control (MAC) layer of the protocol stack when multibeam adaptive antenna arrays are employed at the base station site. Specifically, we analyze the performance of slotted ALOHA when the base station receiver uses multibeam antenna arrays capable of steering the beams selectively on smaller sectors. The effect of different...

Preparing the books to read every day is enjoyable for many people. However, there are still many people who also don't like reading. This is a problem. But, when you can support others to start reading, it will be better. One of the books that can be recommended for new readers is narrowband direction of arrival estimation for antenna arrays narrowband direction of arrival estimation for anten...

Slotted Waveguide Antenna Stiffened Structure (SWASS) is a type of conformal load-bearing antenna where top-hat cross-section stiffeners on skins, or blade stiffeners in sandwich panels, serve the dual purpose of acting both as structural stiffeners and as waveguides. Cutting slots through the outer skin and into these waveguide stiffeners creates slotted waveguide antenna arrays. Two of the ke...