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We consider a beamforming based MIMO system equipped a large scale antenna array in the 60GHz band. In free-space, an optimal (primary) antenna subset is determined heuristically using stochastic approximation to take advantages of full antenna array with limited number of RF chains. As an extension, a smart obstacle avoidance strategy is integrated into the framework of antenna selection in case...
In recent years, smart antenna technology has became the most attractive technology in the 3rd generation systems, it has perfect performances in many aspects such as improving system capacity, expanding cell coverage, reducing the transmit power of mobile station and rejecting multiple access interference (MAI). Beamforming is one of the most important applications in DS-CDMA. Minimum variance is...
This document is based on a study initiated in order to evaluate the influence of different beamforming issues on smart antennas functional performances, by comparing several beamforming methods.
Smart antenna technology is a key technology adopted in TD-SCDMA communication system. There are two main functions of smart antenna, including DOA estimation and beamforming. It is usually difficult to implement the function of smart antenna directly in TD-SCDMA system simulation in OPNET, which is a network simulation tool suited for system level simulation. In this paper, two simulation methods...
In recent years, smart antenna technologies are of ever-increasing interest to boost the capacity of existing and future wireless systems. Several standards support these techniques such as the wireless metropolitan area network IEEE 802.16 (WiMAX) and IMT-Advanced candidates. In applying smart antenna beamforming and Space Division Multiple Access (SDMA) techniques, adaptive antennas are able to...
Smart antenna is recognized as promising technologies for higher user capacity in 3G wireless networks by effectively reducing multipath and co-channel interference. Advent of powerful, low-cost, digital processing components and the development of software-based techniques has made smart antenna systems a practical reality for both base station and mobile station of a cellular communications systems...
The current antenna systems have limited capacity when it comes to the frequency usage. Smart antennas provide a smart solution to this problem by steering the beam power in the desired direction and pointing nulls in the undesired direction. Genetic Algorithm is an optimization algorithm which mimics the underlying phenomenon of evolution of natural species and genetic recombination. In this paper...
Adaptive antenna array has shown real promise for substantial capacity enhancement of increasing the coverage range and capacity of base stations by directing beam patterns towards the desired signals and null-patterns towards the interferers in third generation (3G) mobile systems. We propose in this paper a simple method to evaluate the probability of error in DS-CDMA receivers using a beamformer...
There has been considerable effort over the past few years to develop MANETs and to show their suitability for sensor networks. Concurrently, there has been vast improvement in radio link capability, primarily through the adoption of MIMO antenna technologies. The combination of these elements has been proposed as a means to provide higher performance sensing capability, but models currently assume...
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