The rapidly increasing demand for PCS has provided the impetus to design adaptive antenna arrays to improve spectral efficiency and enhance system capacity. With increasing data rate in some PCS application like DECT( Digital European Cordless Telecommunications), higher BER would degrade the system performance further. An adaptive antenna array testbed using 12 elements was built to evaluate i...

Linear Power Constraint Adaptive Array (LPCAA) and Null Space based Array Antenna (NSAA) were investigated to increase the transmit opportunities of low priority systems under the spectrum sharing condition in [4]. The applicable conditions of LPCAA, however, were limited and the desired signal enhancement by NSAA was not considered in the study. This paper extends LPCAA to cover the case where...

We describe and analyze adaptive antenna array technology to improve naval communications systems to beyond line-of-sight at microwave frequencies by using the ducting layer as a leaky waveguide and the adaptive array to resolve and coherently combine multipath in this layer.

The complexity and dynamics of shallow water limit the performance of adaptive array processors. Matched field processors are especially sensitive since they require accurate environmental models to construct signal replica vectors. The long term goals are i) to determine processors performance limits and ii) to develop robust algorithms for adaptive array processing in shallow water for both a...

DS-CDMA[1] is being investigated for the next generation mobile communication system. In DS-CDMA, to distinguish one user’s transmission from another, each mobile terminal modulates the information data symbols by a pseudo-noise(PN) code and the strong point of this system is that it can easily realize the multi-rate transmission. On the other hand, the transmission power increases in proportio...

Modern Radars use phased array antenna for higher directive gains. These array antennas can be used to form a beam in the desired direction also known as beam steering, if there is any jammer present then it cannot be suppressed by just beamforming or beam steering, in such case we need to use Adaptive antenna. Adaptive antennas use the smart signal processing algorithms also known as adaptive ...