Recently, the radio frequency identification (RFID) technology has gained significant attention. One of the important performance issues in RFID systems is to resolve the collision among responses from RFID tags from the viewpoint of wireless media access control. We consider two kinds of smart antenna systems to enhance the RFID tag reading rate, namely the adaptive array antenna and the multi...

In this paper, we present simulation results for the performance gain of smart dual antennas with adaptive combining at handsets for the forward link in the cdma2000 system. The adaptive algorithm based on the normalized least-mean-square (N-LMS) algorithm is applied, in which antenna weights are recursively obtained. The system was modeled with the SPW of Cadence. Our simulation results show t...

Smart antenna (or multi-beam antenna) systems can support simultaneous transmissions (or receptions) of multiple packets in different beams using the same channel. However, network performance is highly dependent on transmission scheduling. This study develops two transmission-scheduling schemes for use with smart antenna systems to improve network throughput and reduce transmission delay. The ...

As technology developed this decade proves communication is the most important factor for the data interchange. Smart antennas have been considered to be one of the most demanding communication technologies. It adapted as most demanding technology because of high-bit rate or high quality in broadband commercial wireless communication. Many algorithms for smart antenna system have been developed...

In the recent years, ad-hoc network technologies have received much attention from the research community. Therefore, the evolution of these technologies is more rapid, but also results in more complex devices and mechanisms. Furthermore, smart antenna systems have recently become more attractive for utilization in ad-hoc networks, mainly because their cost has been decreasing steadily. This do...

In this paper, we discuss about the problems facing by GSM technology and how a smart antenna system can efficiently counter these problems. Here we present an overview about smart antenna system and how it can be used to eliminate or reduce the problems which limits the performance of GSM. We show here the potential improvements like range extension, multipath diversity, interference suppressi...

This paper presents some hardware implementation results of DOA (Direction Of Arrival) estimator and beamformer developed by our smart antenna project for high speed wireless data transmission. The present system employs smart antenna, FPGA-based digital signal processor and several analog & digital techniques in RF, IF and digital processing, and can estimate DOAs and do beamforming at very hi...

Adaptive smart antenna arrays are used for cellular communication. This paper presents a comparative study of beamforming techniques for adaptive smart antenna using hybrid algorithms like Simple Matrix Inversion with Recursive Least Square (SMI-RLS) and Least Mean Square with Recursive Least Square (LMS-RLS) algorithm. The results are compared on the basis of null depth and error plot for diff...

In this thesis the possibilities of smart antenna systems in wireless mesh networks are examined. With respect to the individual smart antenna tradeoffs, a routing protocol (Modified HWMP, MHWMP) for IEEE 802.11s mesh networks is presented, that exploits the full range of benefits provided by smart antennas: MHWMP actively switches between the PHY-layer transmission/reception modes (multiplexin...

Directional antennas shape transmission patterns to provide greater coverage distance and reduced coverage angle. Use of adaptive directional antenna arrays can minimize interference while also being more energy efficient. When used in an ad-hoc network, this reduces interference among transmitting nodes and thereby increases throughput. Such “smart antennas” use digital beamforming based on si...