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Densely deploying femtocells is deemed as a promising approach to meet the ever-increasing of traffic demands. Efficient resource allocation and interference management becomes to a challenging issue. In this work, we try to address the co- and cross-tier interference issue for densely deployed femtocell networks in order to acquire the expected performance gain. We propose a two-stage framework....
In this paper, power allocation for device-to-device (D2D) communication underlaying cellular networks is investigated. Our optimization task is to maximize the sum rate of the cellular link and the D2D link subject to the maximum power budget and intercell interference constraints. An efficient iterative algorithm is proposed to address the formulated intractable problem, to which the global optimum...
The use of adaptive interference cancellation (AIC) to solve the problem of the radiation interference of a transceiver system has attracted more and more attention. This paper analyzes the noise characteristics of a receiving system which uses an AIC technique for RF front-end filtering, and presents closed-form expressions for noise figure (NF). The comparison of differences between the noise performances...
Device-to-device (D2D) communication underlaid with cellular networks is a new paradigm, proposed to enhance the performance of cellular networks. By allowing a pair of D2D users to communicate directly and share the same spectral resources with the cellular users, D2D communication can achieve higher spectral efficiency, improve the energy efficiency, and lower the traffic delay. In this paper, transmission...
Interference alignment (IA) is a well-known transmission strategy for interference channels, with which the sum rate can linearly scale with the number of users at high signal-to-noise ratio (SNR). However, most existing works on IA considered only the maximization of the sum rate without taking into account the bit error rates (BER) performance. In this work, we firstly propose a novel IA algorithm...
The time delay matching between cancellation path and radiation interference coupling path, in the analog broadband interference cancellation system, is very important. In this paper, we define instantaneous cancellation bandwidth based on the carrier frequency, and deduce the interference cancellation ratio (ICR) in detail with the consideration of large loop time delay mismatch. The numerical relation...
Device-to-device (D2D) communication underlaid with cellular networks is a new paradigm, proposed to enhance the performance of cellular networks. By allowing a pair of D2D users to communicate directly and share the same spectral resources with the cellular users, D2D communication can achieve higher spectral efficiency, improve the energy efficiency, and lower the traffic delay. In this paper, we...
In future 5G wireless networks, inter-cell interference (ICI) is perceived as one of the most critical performance bottlenecks. Traditionally, the interference is treated as an additional source of noise, recent advances in information theory show that interference is not necessarily an opponent, but might be decoded and cancelled to obtain a larger capacity region. In this paper, a sparse code multiple...
A solution refractive index (RI) and temperature simultaneous measurement sensor based on three-beam interferometric fiber-optic were demonstrated. The fringe contrast and the wavelength of the interference will vary with the RI and the temperature of the solution, respectively. Experimental results indicate that proposed three-beam interferometric presents a RI sensitivity of 57.24 dB/RIU in the...
Previous work on 802.1 1x (Wi-Fi) power control have focused almost exclusively on the mitigation of interference from data frames. Since Wi-Fi wireless access points are increasingly ubiquitous, it is now common for an 802.1 1x client to be able to receive signals from more than 10 APs simultaneously in a modern urban operating environment. At such high densities, we found that the interference from...
Recent advances of loop interference cancellation techniques enable full-duplex relaying (FDR) systems, which transmit and receive simultaneously in the same band with high spectrum efficiency. Unlike the existing works, in this paper, we study the energy efficiency aspect of resource allocation in FDR systems. We consider a OFDMA cellular network, where a shared FDR is deployed at the intersection...
With the growing concern over energy consumption, green communication is becoming more and more important. Lots of efforts have been put into investigating in energy-efficient wireless systems. Since Fractional Frequency Reuse (FFR) is a widely-used Inter-cell-interference coordination scheme in the OFDMA wireless network, we consider the energy-efficient power control in the FFR system. With demanded...
Energy consumption in current cellular communication systems becomes more and more critical with the demand for higher throughput and explosive growth of terminal equipment. However, the consumption is evitable in low traffic load time or area, e.g. in late-night. In order to reduce system energy consumption, power off low load base stations is an easy and effective way to reduce energy consumption,...
For Wireless Multimedia Sensor Networks (WMSN), how to increase the throughput in constrained environments has become the main challenge. Multipath routing is a promising solution because it can improve the channel utilization rate, reduce transmission delay and balance the transmission load. To pursue high efficiency for a multipath routing scheme, we need to take the characteristics of wireless...
Large-size infrared touch screen has long response time and external light interference problems. To solve these problems, this paper proposes a method that divides whole infrared touch screen into several separate scanning units and a master module. Each scanning unit completes touch scanning and touch information processing within its own range. Scanning units are parallel working. Master module...
In order to achieve higher data rates and more reliable QoS, coordinated multipoint transmission/ reception (CoMP) is raised in 3GPP release 10 and beyond. Cooperative transmission can effectively improve the performance of cell-edge users with the cost of exchange load between service eNodeB and cooperative eNodeB. Previous work of 3GPP release 11 has noticed the modeling of cooperative backhaul...
With the rapid development process of LTE-Advanced standardization, 8 × 8 and even higher transmission mode are proposed to support higher transmission rate and flexible transmission scheme. However, transmission environment for mobile communications is complicated and diversified, that means the spatial gain will not always increase with the increase of antenna numbers. How to make full use of spatial...
An adaptive inverse beamforming and CLEAN image processing method (IBF-CLEAN) was put forward to cancel tow ship noise. The tow ship noise is a wideband, spatially wide distributing noise with high intensity. It is the primary interference for towed line array. Inverse beamforming (IBF) can be used to cancel such directional noise. Iterative use of IBF can eliminate the reflection paths of the tow...
With the rapid progress of 3GPP LTE/LTE-A's standardization, research about coordinate multi point reception / transmission (CoMP) is very popular. However, topics about CoMP were freezed in around 2009 by 3GPP, so further research and performance analysis about key techniques in CoMP is very little. In this paper, we studied the dynamic cell selection method which is presented in some proposals [1],...
In cognitive radio networks (CRN), underlay spectrum sharing allows secondary users (SUs) to utilize the spectrum on which the primary users (PUs) in primary radio networks (PRN) are working at the same time, without introducing intolerant interferences. In this paper, we study the joint transmission power and time allocation in CRN with underlay spectrum sharing technology. To maximize the total...
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