Smart antennas have been proposed as a physical layer device that can increase the capacity of ad hoc networks. The effectiveness of smart antennas depends on whether access mechanisms create the conditions that enable receivers to adapt to both desired signals and interfering signals and enable transmitters to discern where they must avoid causing interference. The ease of implementing solutio...

Smart antennas can be used to improve the performance of various wireless communication systems. Recently researchers have considered their use in wireless packet-switched networks 1, 2, 3, 4, 5]. In 6], a single-beam system was described which employs a smart antenna basestation operating in carrier-sense (CSMA) mode. Performance improvements can be obtained since the antenna can dynamically p...

This paper proposes a new smart antenna beamforming scheme based on electronically steerable parasitic array radiator (ESPAR). The proposed method is capable of providing better capacity compared to the conventional ESPAR. The termination of each antenna element in this structure comprises a PIN diode in addition to a varactor. Using PIN diode besides the varactor provides more degrees of freed...

In recent years there has been an explosive growth in the number of wireless users, particularly in the area of mobile communication. This growth has triggered an enormous demand not only for capacity but also for better coverage and higher quality of service without increase in radio frequency spectrum allocated for mobile applications. Smart antennas dynamically adapt to changing traffic requ...

In recent years there has been an explosive growth in the number of wireless users, particularly in the area of mobile communication. This growth has triggered an enormous demand not only for capacity but also for better coverage and higher quality of service without increase in radio frequency spectrum allocated for mobile applications. Smart antennas dynamically adapt to changing traffic requ...

Smart antennas exploit the inherent spatial diversity of the mobile radio channel, provide an antenna gain, and also enable spatial interference suppression leading to reduced intracell as well as intercell interference. Especially, for the downlink of future CDMAbased mobile communications systems, transmit beamforming is seen as a well-promising smart antenna technique. The main objective of ...

In recent years there has been an explosive growth in the number of wireless users, particularly in the area of mobile communication. This growth has triggered an enormous demand not only for capacity but also for better coverage and higher quality of service without increase in radio frequency spectrum allocated for mobile applications. Smart antennas dynamically adapt to changing traffic requ...

In recent years there has been an explosive growth in the number of wireless users, particularly in the area of mobile communication. This growth has triggered an enormous demand not only for capacity but also for better coverage and higher quality of service without increase in radio frequency spectrum allocated for mobile applications. Smart antennas dynamically adapt to changing traffic requ...

In this work we present a new routing protocol for sensor networks that utilizes smart antennas to propagate information about a sensed event towards a receiving center. Our protocol is suited for those cases where unexpected changes to the environment must be propagated quickly back to the base station without the use of complicated protocols that may deplete the network from its resources. Th...

With the advent of new wireless mobile internet technologies, there has been a signi cant increase in demand for capacity on the forward link of cellular systems. While signi cant enhancements to the system have improved the performance of the system, there continues to be a greater need for even more capacity on the forward link. Further capacity can only be derived by exploiting the spatial d...