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The development of the fifth generation (5G) wireless technology is in progress to address the increasing demands for high capacity, low latency, and ubiquitous mobile access instigated by next-generation mobile and machine-centric applications. The Centralized/Cloud-Radio Access Network (C-RAN) architecture exploiting the small-cell paradigm has been identified as a promising approach to address...
In this paper, we consider the heterogeneous network, where a macro base station equipped with massive multiple input multiple output (MIMO) antennas provides the wireless backhaul for small cell base stations (SBSs). In this scenario, because the capacity of the small cell is limited by the wireless link with the macro base station, the unbalanced user distribution among base stations might significantly...
Large online video sharing systems are becoming increasingly prevalent among the general public recently. A better understanding of their service usages is crucial for allocating the network resources and adjusting the service design. In this paper, we focus on a leading online video sharing system in China, namely Youku. We collected over 12 billion traffic traces from the network operator, and crawled...
A Terahertz wireless communication link operating at 140 GHz has been established using photonics based technologies. An error free transmission of pseudo random bit sequence at the rate of 5 Gbps has been demonstrated over the link distance of 30 cm.
It is expected that future cellular networks will be densely deployed with both macro cells and small cells to meet the ever-increasing traffic demand, and a cost-effective and reliable backhaul connectivity will be essential to such deployment scenarios. As wired backhaul solutions may not be always practical or feasible, in this paper we consider wireless in-band backhaul for a network with macro...
We study random access for machine-type commu- nications (MTC) based on the notion of compressive sensing (CS) over a distributed input distributed output (DIDO) system consisting of a number of remote radio heads (RRHs) that are closely located to devices. In a DIDO system, each active device can have a signature that depends on its connectivity to RRHs and the signatures of active devices are estimated...
The article discusses the problems of full-duplex communication systems. Such systems include analog and digital cancellation systems. This paper presents an overview of analog cancellations methods and experimental research of the analog and digital cancellation.
In this work, we introduce a powerful hardware-based rogue access point (PrAP), which can relay traffic between a legitimate AP and a wireless station back and forth, and act as a man-in-the-middle attacker. Our PrAP is built of two dedicated wireless routers interconnected physically, and can relay traffic rapidly between a station and a legitimate AP. Through extensive experiments, we demonstrate...
Wireless digital repeaters are used to amplify cellular signals in different scenarios and environments using several frequency bands and radio links. The market for such repeaters varies between the demand for a specific scenario and a specific frequency radio band. In this work we present a dynamic and all purpose FPGA based repeater implemented in an actual industrial product. We present the FPGA...
Recently, wireless sensor in the video surveillance system plays an important role, but the sensor operation is limited by battery capacity. Obviously, the technique to reduce power consumption is necessary. In this paper, a novel lossless embedded compression (EC) algorithm is proposed to reduce the memory bandwidth in video coding. It comprises two core techniques of Multi-directional Gradient Detection...
In this paper, we investigate the problem of pilot optimization, resource allocation, and user association in a massive MIMO heterogeneous network (HetNet) with wireless backhaul (WB) and linear processing. The objective is to maximize the sum downlink rate of all users, subject to constraints on data rate of WB and fairness-aware constraints. Such a problem is formulated as an integer programming...
This paper presents simulation results of a dual-polarized 2×2 element sub-array antenna element at 15 GHz center frequency. The basic idea is to use two waveguides stacked on in a right-angle configuration to excite the orthogonal polarizations by using radiating slots. Above the slots, 4 parasitic patches are set to a form of 2×2 element sub-array. Antenna presents −10 dB impedance bandwidth from...
This paper investigates a signal area (SA) estimation method for spectrum measurements. The spectrum measurements is for estimating statistical information of spectrum usage and required latency is not very critical compared to spectrum sensing. SA denotes the area (in time/frequency domain) occupied by the primary user's signal. The traditional approach, which utilizes Fourier transform (FT) and...
Wi-Fi is the dominant wireless indoor broadband solution and thus key for meeting the exponential traffic growth. The recent IEEE 802.11ac amendment enables PHY data rates exceeding 1 Gbps. However, it is not clear how this increased per-link performance, achieved especially via wider channels, translates to network-level performance. The latter is crucial for understanding the true potential of emerging...
The paper aims to provide a high-level view of 5G fronthaul and backhaul wireless transport over millimeter wave (mmWave). In particular, an overview of data rate and latency requirements for three emerging fronthaul interfaces (functional split options) in addition to the backhaul will be given first. Then, the suitability of mmWave technology for transport of these fronthaul and backhaul traffics...
We consider the practical problem of video surveillance in public transport systems, where security videos are stored onboard, and a central operator occasionally needs to access portions of the recordings. When this happens, the selected video must be uploaded within a deadline, possibly using multiple parallel wireless interfaces. Interfaces have different associated costs, related to tariffs charged...
By placing processing-capable devices at the edge of local wireless access networks, Edge Computing architectures have been recently proposed to connect mobile devices to computational power through a one-hop low-latency wireless link. In this paper, we propose a new design where edge assistance is used to control local data filtering at the mobile devices in bandwidth and energy constrained systems...
The design of a 1–8 Gb/s optical wireless communication (OWC) dual-mode receiver is presented in this paper. The transimpedance amplifier (TIA) based reconfigurable receiver implements a high-sensitivity (HSS) mode to enable 1Gb/s OWC link over long distance, while a high speed (HSD) mode to enable up to 8Gb/s OWC link over short distance. In the HSS mode, the receiver is designed for high gain and...
Pulse-based ultra-wideband (UWB) transmission is the emerging opportunity for modern wireless communication in the microwave and millimeter-wave (mm-wave) frequency ranges. In this frame, monocycle pulse has been emerged as the suitable candidate for next-generation (5G) UWB communication. This paper explores the time-domain (TD) analysis of monocycle pulse propagation in lossy environment. Free Space...
Over the past few years, many major wireless providers restricted their unlimited data plans and replaced them with limited-size fixed-price data packages. While this could be perceived as a disadvantage for customers, it helps the cellular wireless providers to reduce the traffic intensity at their base stations. Then the lower traffic intensity leads to a better service quality and higher rates...
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