[Show abstract][Hide abstract] ABSTRACT: A performance comparison between uniformly and non-uniformly spaced adaptive array antennas in a mobile fading environment is presented. Here, deterministic and simulation models of the frequency-non-selective mobile fading channels are investigated and used to explain the behaviour of steered beam adaptive arrays in terms of the output signal-to-interference-plus-noise ratio and pointing accuracy. It is found that the non-uniformly spaced arrays give a performance improvement of >25% in comparison with the uniformly spaced arrays.
IET Circuits Devices & Systems 03/2008; · 1.02 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: This paper presents the performance of steered beam adaptive array antennas in mobile fading environment. Here, deterministic and simulation models of the mobile fading channels are investigated and used to explain the behavior of steered beam adaptive arrays in terms of output signal-to-interference-plus-noise ratio (SINR) and pointing accuracy.
[Show abstract][Hide abstract] ABSTRACT: The paper presents theoretical and experimental investigations into performances of narrowband uniformly and nonuniformly spaced adaptive linear dipole array antennas that are subjected to pointing errors. The analysis focuses on the array's output Signal to Interference plus Noise Ratio. The presence of mutual coupling between the array elements is taken into account. It is shown that the array's tolerance to pointing errors can be enhanced by controlling the interelement spacing. (c) 2006 Wiley Periodicals, Inc.
Microwave and Optical Technology Letters 01/2006; · 0.59 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The paper presents a method to mitigate the effect of multipath propagation using an adaptive array antenna. It is shown that, by controlling the number of active elements and their spacing, the array's capability to eliminate scattered signals can be enhanced in the presence of pointing errors. We consider a non-uniform inter-element spacing of the array. In practice, this can be achieved by switching some elements on or off electronically, and/or by mechanical displacement of the elements.
Antennas and Propagation Society International Symposium, 2005 IEEE; 08/2005
[Show abstract][Hide abstract] ABSTRACT: In mobile wireless communication systems, the multipath propagation in addition to the movement of the receiver and/or the transmitter leads to drastic and random fluctuations of the received signal. For flat fading channels, the extended Suzuki process of type II has been proposed as a stochastic model of such received signal fluctuations. In this paper we discuss this stochastic model and an appropriate deterministic model, and subsequently present and analyze simulation results based on these models.
Signal Processing Advances in Wireless Communications, 2005 IEEE 6th Workshop on; 07/2005
[Show abstract][Hide abstract] ABSTRACT: The Applebaum adaptive array suffers from its sensitivity to errors in steering vector, such as pointing error which results when the desired signal arrival angle may be known approximately but not exactly or when the desired signal arrival angle may be estimated from the received signal. In the present work, the effect of the pointing errors on the performance of the adaptive array is demonstrated, and a method for minimizing this effect is investigated