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A sensitivity analysis of two distortionless beamformers is presented in this paper. Specifically, two well-known variants, namely the minimum power distortionless response (MPDR) and minimum variance distortionless response (MVDR) beamformers, are considered. In our scenario, which is typical to many modern communications systems, waves emitted by multiple point sources are received by an antenna...
Size and cost considerations of handheld terminals limit the use of antenna array for combating multipath fading in these applications. Recently, a synthetic array based on moving a single antenna was proposed for handheld terminals. This technique however fails to provide enough diversity gain when the channel is spatially correlated. A combination technique based on merging polarization and spatial...
The paper discusses the possibility of using a short-term, short-range fading characterization to turn a selective channel problem into a flat fading problem. By estimating or measuring the angle of arrival, phase shift, and amplitude of the incoming signal this characterization can be obtained. It is the antenna array that has the main role here. We call this proactive antenna implication, antenna-based...
The constant modulus array (CMARY) blind beamformer has the main drawback of typically capturing the signal that has the greatest power among the received cochannel signals. Hence, the capture process should be guided by controlling the initial beam steering. The minimum variance distortion less response (MVDR) beamformer is used to estimate the initial beam steering of the CMARY; this combination...
A new adaptive beamforming method for direct sequence code division multiple access (DS-CDMA) communication systems is proposed, which has low computational load. The proposed method needs only 2N+1 complex multiplications and 2N-1 complex additions, where N is the number of antennas in the array. We evaluate the performance of the proposed method in estimating the angle-of-arrival (AOA) of the desired...
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