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RF energy harvesting based on wireless energy transfer (WET) can release mobile terminals from battery constraint and has drawn significant research interest. In this paper, in order to solve the problem of Simultaneous Wireless Two-Way Information and One-Way Energy Transfer (TWI&OWE-SWT) in MIMO systems, an Adaptive Time-slot and Power Allocation Scheme (A-TPAS) is proposed. And to maximize...
Base station (BS) can transmit directional beams towards specific users by downlink beamforming. However, the inter-beam interference can affect the achievable capacity severely. In this paper, we propose a user grouping method for downlink beamforming in massive multiple-input multiple-output (MIMO) system. Our method aims to group users according to the severity of inter-beam interference: users...
A new coarse synchronization scheme for 3rd Generation Partnership Project Long Term Evolution (3GPP-LTE) is proposed. Existing coarse synchronization schemes based on central symmetry utilize either primary synchronization signal (PSS) and secondary synchronization signal (SSS) to fulfill initial timing synchronization. Though these two schemes perform well with relative low complexity, they can...
Despite the advantages of deploying femtocells into cellular networks, the consequent cross-tier interference has seriously limited the network performance. In the downlink, specially, the strong interference from Femtocell Base Stations (FBSs) to nearby macrocell users (MUEs) causes significant coverage holes. Applying different power control techniques has been heavily discussed in 3GPP as an efficient...
As conventional single-layered network cannot satisfy the increasing demand in high-speed indoor data service, femtocell has been introduced to provide higher network capacity and better user experience. However, the downlink transmit signal from femtocell base station (FBS) may result in severe cross-tier interference to macrocell users (MUE). To address this problem, we propose a dynamic femtocell...
Joint User and Antenna Selection (JUAS) with global optimal solution for multi-cell Multi-User Multiple Input Multiple Output (MU-MIMO) systems needs the centralized processing and full Channel State Information (CSI) sharing that both require high capacity backhaul links. In this paper, decentralized JUAS algorithm is considered for multi-cell MU-MIMO systems with Block Diagonalization (BD) precoding...
This paper investigates downlink frequency resource coordination for LTE network that comprises of macrocell and femtocell. Due to the requirement of high data rate for indoor coverage, femtocells have been considered as a potential solution recently. However, owing to their random and uncoordinated deployment, cross-tier interference exists and affects the system throughput seriously. A hybrid resource...
The frequency resource of mobile communication systems is intensive and it needs to combine with cognitive radio technology. The mobile telecommunication system subscribers are sensitive to interference, making the interference problem need prompt solution. This paper analyzes the inter-system and intra-system interference and proposes the approach of utilizing spectrum holes classification. The spectrum...
In this paper, web response time is utilized to indicate the performance of web cache in asymmetrical wireless network. The impacts of WAN delay, user load level and link asymmetries on web response time are investigated in our evaluation. Our study demonstrated that caching scheme performs poorly when uplink quality degraded. Based on the analysis of correlations between cache performance and link...
In this paper, we described the correlations between user perceived Web response time and the asymmetrical link characteristics. Our study demonstrated that the HTTP compression strongly affects the Web response time when uplink resources are limited. The constraints on uplink degrade Web performance seriously. In addition, we also found that it is possible to reduce Web response time through cross...
In this work the authors show how the asymmetry characteristics of wireless network strongly affects the Web response time of user. It is found that uplink delay degrades Web performance because additional bytes overhead and time overhead are introduced. On the other hand, the study also shows that reduction of Web response time is possible through protocol optimization on different layer of protocol...
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