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Fifth generation wireless communication systems can achieve massive throughput increases from multi-user, multiple-input multiple-output systems combined with the emerging use of millimeter wavelengths in small heterogeneous cells. In this paper, we propose a beamforming algorithm for an outdoor millimeter wave, multiuser network, which exploits polarization diversity. First, we propose an adaptive...
The exponential increase in data traffic demand has focused attention on two layer network deployment strategies where low-power pico base-stations are placed within a macro cell coverage area targeting specific capacity demands. Two aspects of such a network are different from a macro-only deployment and are studied in this paper — (i) the choice of antenna geometry and polarization for a non-sectorized...
It has been recognized that a primary method of further enhancing the spectral efficiency of LTE Release-8 is to improve support for multi-user (MU) MIMO transmission in the downlink in an efficient manner. This paper investigates the performance improvements due to the enhanced support of single-cell MU-MIMO within the framework of LTE evolution (specifically LTE Release-9 and Release-10 also known...
Obtaining reliable channel state information (CSI) in future wireless standards is critical for the operation of downlink closed-loop techniques such as SU-MIMO, MU-MIMO, and coordinated multipoint (CoMP). However, this CSI is difficult to obtain especially when considering the potentially strong interference from neighboring sectors/base stations on the downlink reference symbols (RSs, aka pilot...
We report the realization of a fiber coupled polarization entangled photon-pair source at 1310 nm based on a birefringent titanium in-diffused waveguide integrated on periodically poled lithium niobate. By taking advantage of an original setup, we characterized the quantum properties of the pairs by measuring two-photon interference in both Hong-Ou-Mandel and standard Bell inequality configurations...
In existing systems, information are protected by security models that control the accesses to the information, depending on their security level. In such systems, allowing accesses that were previously denied by diminishing the security level of the information is called downgrading. Controlling this downgrade of sensitive information is an important issue in computer security, as it requires the...
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