Optimizing antenna arrays to approximate desired far field radiation patterns is of exceptional interest in smart antenna technology. This paper shows how to apply artificial intelligence, in the form of neural networks, to achieve specific beam-forming with linear antenna arrays. Multilayer feed-forward neural networks are used to maximize multiple main beams’ radiation of a linear antenna arr...

In this paper, we present simulation results for the performance gain of smart dual antennas at handsets for the forward link in the cdma2000 system. The system was modeled with the SPW of Cadence. Three types of the channel model, two levels of diversity combining, and three diversity combining schemes were investigated. Our simulation results show that the average performance gain (reduction ...

This paper presents a novel slotted ALOHAbased protocol for use in ad hoc networks where nodes are equipped with adaptive array smart antennas. The protocol relies on the ability of the antenna and DoA (Direction of Arrival) algorithms to identify the direction of transmitters and then beamform appropriately to maximize SINR (Signal to Interference and Noise Ratio) at the receiver. The performa...

In this paper we investigate the impact of spatiotemporal channel models on the system-level capacity in the UMTS FDD uplink. We study the performance of spacetime processing for flat fading and COST 259 channel models. The results are expressed in terms of multiple-access noise rise, which is derived by a stationary system simulator. Smart-antennas provide a clear advantage in mixed rate traff...

Genetic algorithm for optimization of beam forming in linear array antenna is used. The goal is to achieve a -30 dB in the null of pattern with the capability of steering the null angle over the all frequency band. Our simulation shows a -30 dB up to -60 dB for this purpose. SPAA (Smart Phased Array Antenna) which is software for analysis, synthesis and simulation of adaptive phased array anten...

Ab$@uct-An adaptive antenna places nulls in its antenna pattern in the direction of the interfering sources. shifters. Adaptive antennas are a subset of smart antennas, and have received considerable interest in the recent wireless revolution. This paper presents a successful application of a genetic algorithm with an experimental antenna for placing a null in the direction of an interference s...

Smart phones owe some of their multimode, multiband capabilities to multithrow antenna switches. As mobile handsets evolve, a single antenna switch may handle as many as 10 transmit (Tx) and/or receive (Rx) ports. The challenges facing multithrow antenna switches for these applications are not trivial but, fortunately, solutions exist for managing high throw counts while still maintaining excel...

In 3G mobile communication systems, smart antenna processing is seen as a powerful tool to combat directional interference. In this paper we derive the statistics of the signal-tointerference+noise ratio (SINR) achieved by the combined Rake receiver-smart antenna processing for the case where the thermal noise is the only source of interference, and for the case of another interfering user. The...

Electronically Steerable Passive Array Radiator Antenna (ESPAR) is a smart antenna that can help to improve the performance and effectiveness of wireless network systems, especially in ad hoc networks. There are several benefits that can be attained by smart antenna, such as better range and coverage, increased capacity, multipath rejection and reduced expense. In this research, the antenna str...

This work deals with performance limits when using smart antennas in future wireless systems. The current evolution in the field of wireless communication implicates a substantially increased demand on transport capacity. Smart antennas is one very powerful means to fulfill these demands. In this work the use of smart antennas, deployed at either the access point or both the access point and th...