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This paper reports the methodology and results from our latest field measurement campaign for characterizing the 3-dimensional (3D) MIMO channel, particularly in the elevation domains, in a typical urban macro (UMa) environments in Beijing, China. Stochastic channel model parameters are obtained based on the high-resolution multi-path parameter estimates. In addition, a distance dependent elevation...
Multicast services are highly desirable in 60-GHz millimeter-wave communications, but multicast beamforming remains a challenge due to special structure of high frequency system. To solve this problem, a transmit and receive multicast beamforming scheme has been proposed in this paper. Unlike conventional multicast models in LTE/EMBMS, every device in proposed system is equipped with a multi-antenna...
Along with the attention drawn to the millimeter-wave frequency bands for the drastically increased data rate support for the next generation (5G) mobile communications, the hybrid beamforming architectures combining analog beamforming and digital precoding have been investigated as potential candidates to provide good compromise between the complexity and the performance. Among the different hybrid...
In a classical multi-radio multi-channel Wireless Mesh Network (WMN) architecture, mesh nodes use omni-directional antennas. Due to the circular radiation pattern of such antennas, when a mesh node communicates with its neighbor on a certain frequency channel, other mesh nodes within its range must remain silent. Directional antennas have been proposed as a way to improve spatial reuse. Since these...
Explicit multicasting protocols such as Differential Destination Multicast (DDM) in MANETs have been retaining advantages of traditional approach while eliminating their shortcomings especially for small-group applications. However, they still have some drawbacks especially in the group size limitation. In this work we discussed a new unified unicast and multicast routing scheme called Arithmetic...
We propose a new accurate ranging algorithm for Time of arrival (ToA)-based wireless network localization. Although many works have been done in the current literature to optimize localization and tracking algorithms, the mitigation of ranging errors is still a very challenging problem. To this end, we combine and optimize two well-known super-resolution algorithms such as Music and Root-Music, commonly...
A novel hybrid information dissemination scheme is proposed for picocellular systems. At the first stage of our scheme, some of the mobile users (MUs) successfully receive the information of common interest via BS-aided multicast. At the second stage, the information is cooperatively multicast (co-multicast) by the information owners (IOs) in a self-organized ad hoc network until all the MUs receive...
Recently, mobile social networks (MSNs) have been widely discussed due to the rapid growth of smart mobile devices. This work focuses on mobile D2D social networks (MDSNs), where users in an MSN are physical neighbors. An important social application of MDSNs is common profile matching (CPM), which refers to the scenario where a group of smartphone users meet in a small region (such as a ball room)...
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