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A possible approach to address spectrum congestion is to develop signaling schemes that allow for spectrum sharing with minimum system interference. In this paper, we consider the problem of co-existence between radar and communications systems by designing a common signaling scheme to jointly optimize the performance of both systems. In particular, we derive constraints on the parameters of linear...
User association and resource allocation for downlink orthogonal frequency division multiplexing (OFDM) should be jointly optimized in small cells networks with limited backhaul in order to maximize the network utility. In general, the joint user association and per-band resource allocation problem is known as an integer NP-hard problem requiring exponential order of computational complexity to find...
We study the benefits arising from the exploitation of interference in two satellite communications scenarios. We show that promising gains, with respect to the classical interference avoidance approach, can be achieved by applying non-orthogonal transmission schemes together with advanced transceiver architectures. We demonstrate that the non-orthogonal solutions significantly outperform the classical...
System capacity in LTE network becomes a more important factor in that voice call is changing from circuit switching to packet switching. In particular, quality improvement in uplink is far more challenging than downlink due to transmit power restriction in UE and fractional inter-cell interference. A novel frequency selective scheduling algorithm for uplink capacity enhancement is proposed and its...
Previously, we proposed the active access-point (AP) configuration algorithm for elastic Wireless Local-Area Network (WLAN) systems using heterogeneous APs. This algorithm activates or deactivates APs depending on traffic demands, assuming that any active AP can use a different channel to avoid interferences among APs. However, the number of non-interfered channels in IEEE 802.11 protocols is limited...
The development on the underwater communication network for sea observation is on the rise due to increasing importance of its applications such as oceanography, marine commercial operation and military surveillance. In this paper, we design the system-level simulator (SLS) architecture for the underwater acoustic communications which can be the basis for the design model of future application-specific...
Video conferences over the Internet with multiple participants have to be wirelessly connected to improve the communication efficiency. However, video conferences are often held in places suffering from crowded wireless medium, such as offices and schools. This leads to many challenges on providing high video conferencing experience. In this paper, we study the problem of video streaming over crowded...
Social relations between users is a key factor impacting the willingness of users to participate in D2D delivery. However, close social ties and proximity location of users can not always be satisfied due to the time and space limits. In this paper, we introduce social credit to stimulate selfish users for an active D2D communication networks, which is a global and wide social feature measure. Queuing...
The paper introduces the future wireless network capacity trend and the corresponding spectrum challenges. Serial maximization spectrum efficiency solutions are proposed, Finally a successful deployment commercial case is summarized.
This paper describes Concurrent Migration of Multiple Pages (CMMP), a new hardware-software mechanism for managing hybrid main memory (DRAM+PCM). CMMP migrates multiple pages concurrently without significantly affecting the memory bandwidth available to applications. CMMP provides a simple interface for the OS to observe memory access patterns. CMMP reduces PCM-to-DRAM transfer bandwidth by copying...
An EUTRAN offers Multi-Point connectivity from base station (eNB) toward the UE for reliable connection under mobility. This enhances the user experience with committed throughput. Radio resource allocation is a complex arrangement of resources in multiuser scenario, and it became more cumbersome if UE offer optional or alternative path to connect the network. Generally in network radio resources...
The high peak to average power ratio (PAPR) and large spectrum sidelobe power are the two major limitations at the transmitter side of the NC-OFDM based Cognitive Radio (CR) system, which may significantly reduce the power efficiency and performance of the system. There are many techniques in the literature to reduce high PAPR and large spectrum sidelobe power. In this paper, we present a new optimization...
Concurrent accesses to the shared storage resources in current HPC machines lead to severe performance degradation caused by I/O contention. In this study, we identify some key challenges to efficiently handling interleaved data accesses, and we propose a system-wide solution to optimize global performance. We implemented and tested several I/O scheduling policies, including prioritizing specific...
In this paper, we consider bandwidth efficient design and channel estimation over time-varying frequency-selective environments, where the basis expansion model (BEM) is used to describe the time-varying channel. Superimposed training based channel estimation based affine precoding model is designed, where the data interference is eliminated from received data prior to performing channel estimation,...
This article covers some key approaches to solve the problem of reducing inter-cell interference in wireless networks, such as LTE, caused by lack of frequency reuse principle. On the basis of the author's simulation model it was done a comparative analysis of the existing solution in terms of achievable throughput and the probability of blocking the traffic channel PUSCH and PDSCH. The simulation...
This article covers some key approaches to solve the problem of reducing inter-cell interference in wireless networks, such as LTE, caused by lack of frequency reuse principle. On the basis of the author's simulation model it was done a comparative analysis of the existing solution in terms of achievable throughput and the probability of blocking the traffic channel PUSCH and PDSCH. The simulation...
In cloud computing, multiple servers are consolidated into a physical machine in order to reduce the cost of deploying the servers. Guaranteeing the service level objective (SLO) of each server is one of the most important factors in a virtualization system. Particularly, isolating the I/O resources among VMs competing for a shared storage system is challenging. Recently, use of flash based Solid...
Aeronautical vehicle use, and consequently, air-to-ground communication systems, are growing rapidly. A growing portion of these vehicles are unmanned aerial vehicles (UAVs) or unmanned aerial systems (UAS) operating in civil aviation systems. As a consequence of this growth, air traffic volume for these vehicles is increasing dramatically, and it is estimated that traffic density will at least double...
Achieving low and predictable execution time of short jobs in Hadoop clusters has gained a great attention due to their importance on system productivity and user experience. However, one major contributor that makes it challenging is diskI/O interference. We observed that disk writes unintentionally block latency-sensitive short jobs and cause unexpected high latency. Unfortunately, previous research...
In this paper, we propose an anti-interference cooperative spectrum sharing strategy based on fairness secondary users selection where the secondary system can gain spectrum access to the primary system. Specifically, secondary user STb and STq are selected to transmit the primary and secondary signal by using different bandwidth in the second transmission slot which occupies a part of the whole transmission...
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