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In this paper, we consider robust direction-of-arrival (DOA) estimation for an array that contains mis-calibrated sensors with unknown gain and phase uncertainties. We develop two robust DOA estimation algorithms based on the maximum correntropy criterion (MCC). In the first algorithm, adaptively optimized weighting factors are obtained and applied to each sensor to effectively mitigate the effect...
We investigate selection beamforming for a cooperative network that consists of a source, a destination, and two amplify-and-forward (AF) relays, which are all equipped with multiple antennas. The transmit and receive beamforming techniques are respectively applied at the source and destination, and the linear processing operator of the selected AF multiple-input multiple-output (MIMO) relay is optimized...
Small unmanned aerial vehicles (UAVs) have found wide use in civilian and military applications. One of the important applications is to relay information in an obstructed line-of-sight environment so as to maintain reliable wireless communication links between users which are difficult to directly communicate to each other. The use of multiple networked UAVs as relay nodes can further enhance spectral...
It has been shown that, in multi-source multi-relay networks, the use of network coding that utilizes cooperation among intra-cluster nodes can improve the outage performance. When each node is equipped with a single antenna, the relay-destination link will become the bottleneck that limits the overall network diversity gain. In this paper, we propose the use of multiple antennas at the destination...
Radar-based tracking technologies enable sub-time-of-flight bullet detection and trajectory tracking before the bullet reaches its target and thus lead to effective reduction of injuries and casualties. The capability of robust detection, tracking, and trajectory prediction in a weak signal environment directly translates to the awareness time for force protection. In this paper, we develop a multi-sensor...
This paper considers the minimization of overall power transmitted from source and relay nodes in a multiuser cooperative network, constrained with the quality of service (QoS) of each user determined by their output signal-to-interference-plus-noise ratio (SINR). In this paper, we consider a two-hop cooperative wireless network consisting of single-antenna nodes in which multiple concurrent links...
The use of multi-beam antennas provides a wireless network node with the capability of concurrent communications with multiple nodes in different directions. Multi-beam antennas have been shown to improve network throughput as well as reliability. In this paper, we consider an array processing based framework in which channel collision is avoided for improved efficiency while interference to ongoing...
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