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In the downlink of the Cloud-Radio Access Network (C-RAN) cellular architecture, complex baseband signals are transmitted from a central unit (CU) in the “cloud” over digital fronthaul links to distributed radio units (RUs). The standard design of digital fronthauling is based on quantization that operates separately over each fronthaul link. In this paper, a fronthaul quantization scheme is proposed...
In orthogonal frequency-division multiplexing access (OFDMA) system, a distributed Bayesian compressive sensing (DBCS) based blind carrier frequency offset (CFO) estimator has been proposed, which offers a significant improvement on the performance of multiple-parameter estimation, compared with the existing subspace theory based method. However, the analysis for theoretical performance and computational...
In the Low Density Signature (LDS) based multiple access systems, the constellation of chip symbols superposed by several users' symbols is named as superposition constellation. When LDS is applied into the downlink multiple access scenario, maximizing the minimum Euclidean distance of the superposition constellation will be a big challenge. In this paper, by optimizing the superposition constellation...
This paper studies the fairness of achievable energy efficiency (EE) in a multicell multiuser multiple-input single-output downlink. The objective is to maximize the minimum EE among all base stations (BSs) subject to per-BS power constraints. The resulting optimization problem is a max-min fractional program, and, thus, difficult to solve in general. Our goal is to develop a decentralized algorithm...
With the rapid growth of Internet technologies, cloud computing and social networks have become ubiquitous. An increasing number of people participate in social networks and massive online social data are obtained. In order to exploit knowledge from copious amounts of data obtained and predict social behavior of users, we urge to realize data mining in social networks. Almost all online websites use...
Due to the tiny wavelength of millimeter waves (mmWave), tens of antennas can be packed into a small area in mmWave transceivers. However, implementing a radio-frequency (RF) chain for each antenna is impractical due to the high cost and power of mixed-signal devices. To reduce the cost and get benefit from the antennas, an analog RF beamformer is implemented using variable gain amplifiers and analog...
Since mobile network operators not only need to satisfy user needs but also have to reduce operating cost (mainly electricity cost) to maintain long-term profitability under strict market competition, energy efficiency (EE), defined as capacity per energy cost, becomes a popular metric for designing mobile networks. For user-centric services, however, the metric of quality of experience (QoE) is more...
Intelligent Transport System (ITS) shall be able to incorporate transparently and seamlessly a large number of different and heterogeneous traffic system, while providing communication access to vehicles with various Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communication for the development of a safety commuting service. Building a route forecasting system is a complex task, mainly...
Collision on road is a classic and important problem as it brings about great loss on humans' safety and the efficiency of the traffic system. Numerous algorithms have been proposed to address the issue, and most of the existing researches are focused on rear-end, overtaking and lane change scenarios. However, due to the massive computing process, limitation of prediction time and complex layouts...
Millimeter-wave (mmWave) communication has emerged as one of the most promising technologies to deal with the increasing demand in data transmissions over wireless networks. However, due to the propagation characteristic at the mmWave band, much higher pathloss is observed compared to the commonly-used microwave band. Thus, antenna arrays become a necessary ingredient in mmWave systems because of...
Location-Based Service (LBS) is one of the fundamental and central functionalities of mobile social networks. Since users usually have to report their locations to the LBS providers while using services, the protection of user's location privacy poses a critical challenge. Although many existing approaches can preserve user's location privacy effectively, most of them must include and use the user's...
Information cascade characterizes the situation where rational agents are overloaded with social observations and can make decisions ignoring their own personal evidence. If the social observations are misleading, the overall system performance can be subsequently compromised. Therefore, it is of interests to design a socially or interactively networked system falling into undesirable or desirable...
Recently, millimeter wave wireless communications have emerged as one of the most promising technologies to significantly improve the throughput of massive multiple-input multiple-output (MIMO) system. Since high-frequency channels are quite easily attenuated in space, beamforming technology based on the massive MIMO is introduced to transmit the millimeter waves in a very narrow directional beam...
Interplanetary Networks (IPN) are classified among challenged networks and hence are hard to model using static graphs. Furthermore, they do not behave optimally when operated using the standards and techniques of static networks. Delay Tolerant Networking (DTN) is one of the suggested solutions to overcome these networks' challenges. The more widely used implementation of DTN uses Contact Graph Routing...
In this paper, we study the joint prioritized link scheduling and resource allocation for the OFDMA-based wireless network which serves two classes of user links, namely non-prioritized (low-priority) and prioritized (high-priority) links. Our design objectives are to maximize the number of non-prioritized links to be scheduled and to maximize the weighted sum rate of all scheduled links while guaranteeing...
In this paper, we design the low-complexity tree search-based detectors for generalized spatial modulation (GSM) aided single carrier (SC) systems over dispersive channels. Specifically, we commence with a brief review of the existing detection algorithms and then extend the sphere decoding-aided (SD) tree search algorithms designed for flat fading channels to GSM-aided SC systems. Moreover, a pair...
In heterogeneous cellular networks, users are sometimes forcibly redirected into a low power base station (BS) for the purpose of data offloading. In order to guarantee an acceptable performance for such users, who suffer from severe inter-tier interference, enhanced inter-cell interference coordination (eICIC) was proposed. Using this technique, macro BSs periodically mute their data transmission...
Solving large-scale systems of linear equations (L-SLE) is a common scientific and engineering computational task. But such problem involves enormous computing resources, which is burdensome for the resource-limited clients. Cloud computing enables computational resource-limited clients to economically outsource such problems to the cloud server. However, outsourcing LSLE to the cloud brings great...
In this paper, we focus on the issue of maximizing the data collected by a mobile sink with unlimited energy which traverses a given straight path in an energy harvesting wireless sensor network (EH-WSN). Sensors are assumed to harvest energy periodically from the solar resources in their surrounding. Due to limitations on energy replenished within different time intervals, the sensors can reduce...
Technologies in millimeter wave (mmWave) communications have gained increasing attention because of its potential to provide substantially extra bandwidth. The main challenges of mmWave communications include high propagation attenuation and sparse scattering propagation channel. A promising technique to cope with propagation attenuation is to adopt antenna array, and use the hybrid transceiver architecture...
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