By comparing the disadvantages and advantages of conventional algorithms of adaptive beamformer, we put forward an adaptive beamformer based on weight iterative algorithm for suppressing radio frequency interference (RFI), according to the distributing properties of RFI in different range cell. We get the initial weight vector of the adaptive beamformer by utilizing the algorithm of minimum var...

In various communications-based adaptive array applications, the directions of arrival (DOAs) of the desired user signal are sparsely separated. As such, the desired beam-pattern has a sparse structure. We propose an NLMS based adaptive algorithm which exploits this sparse DOA structure and provides significantly improved convergence speeds.

We present two methods for nonuniformity correlation of imaging array detectors based on neural networks; both exploit image properties to supply lack of calibrations and maximize the entropy of the output. The first method uses a self-organizing net that produces a linear correction of the raw data with coefficients that adapt continuously. The second method employs a kind of contrast equaliza...

Phased array antennas are deployed in electronic systems where high beam directivity and/or electronic beam scanning is desired in applications ranging from radar systems to smart antennas in wireless communication where errors such as random and/or correlated fluctuations present in the excitation coefficients of a phased array can degrade its performance. The errors due to random environmenta...

Wireless ad hoc networks have traditionally been assumed to use omni-directional antennas. However, it has been recently recognized that the use of advanced antenna technologies could help alleviate the capacity limitations of multi-hop wireless networks, stemming from interference generated in the shared medium [1]. Adaptive array antennas have the ability to automatically respond to an unknow...

We designed and tested a two-dimensional silicon receptor array constructed from pixels that temporally highpass filter the incident image. There are no surround interactions in the array; all pixels operate independently except for their correlation due to the input image. The high-pass output signal is computed by sampling the output of an adaptive, high-gain, logarithmic photoreceptor during...

Liquid microlenses are attractive for adaptive optics because they offer the potential for both high speed actuation and parallelization into large arrays. Yet, in conventional designs, resonances of the liquid and the complexity of driving mechanisms and/or the device architecture have hampered a successful integration of both aspects. Here we present an array of up to 100 microlenses with syn...