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A coordination strategy among a large cellular MIMO network is presented in this paper. With clustered linear precoding and dynamic frequency reservation techniques, JDFR-BDGMD (Joint Dynamic Frequency Reservation and Block Diagonalization precoding with Geometric Mean Decomposition precoding scheme) greatly mitigates intra-cluster interference as well as inter-cluster interference in the downlink...
The article presents a prototype of a distributed system for wheelchair users assessment characterized by multi-sensing, embedded processing compatible IEEE 1451.4 standard for smart sensors and wireless communication based on IEEE 802.15.4. A set of smart sensing channels are connected in a 1-Wire network supported by an embedded platform that assures the acquisition and appropriate digital processing...
Energy-efficient communication has attracted more and more attention due to the large energy consumption in wireless communication network. Relay-assisted OFDM cellular network is one of the most effective frameworks in the IMT-Advanced system to improve the spectral efficiency. This paper investigates the energy-efficient resource allocation for multiuser two-way multi-relay OFDM network. We formulate...
In cellular networks, Device-to-Device (D2D) links can be utilized for data dissemination via unicast or/and multicast within a cluster. For traditional D2D relay schemes, D2D links with poor channel conditions may be the bottleneck and result in conservative resource utilization. Therefore, we suggest preferentially selecting the good quality D2D links with high achievable data rates, which induces...
The growth pattern of wireless, mobile devices, cloud computing, social networking applications, and Internet technologies leads to a very revolutionized communication market. These also have greatly impacted the social and economic fabric. One may expect highly dynamic markets, different definition of resources, and frequently swappable stakeholders roles. In this paper, we present our vision of...
Due to the time-varying nature of wireless channels, deterministic quality of service (QoS) is hard to guarantee in wireless networks. In this paper, by integrating information theory with the principle of effective capacity, we formulate an energy efficiency optimization problem with statistical QoS guarantee in the uplink of two-tier femtocell networks. To solve the problem, we introduce a Q-learning...
The dramatic development of high speed railway (HSR) has spurred great interest in extensive studies on the fading characteristics of the radio channel in all the relevant scenarios. Approved by the Ministry of Railways of China, single input single output (SISO) measurements were performed at 2.6 GHz with 40 MHz bandwidth along the Harbin-Dalian passenger dedicated railway line. In this paper, we...
This paper presents a quantization scheme for log-likelihood ratios in order to reduce the computational complexity of an iterative decoder recently proposed for wavelet-coded communication systems. In order to reduce the computational effort, the real-valued LLRs of encoded bits are quantized into three levels of reliability, with a threshold that is determined by minimizing the mean squared error...
The key factors for a routing protocol in Ad Hoc networks include route discovery, route maintenance and route destroy. Our laboratory has done a lot of researches based on our Ad Hoc hardware platform applying the classical AODV protocol. We found out that an essential cause for unsuccessful route discovery, instable route or even the limitation of hop numbers can be summarized as the bad channel...
An empirical investigation on the dependence of TCP upstream throughput against signal to noise ratio (SNR) in an IEEE802.11b WLAN system was carried out in various environments and varieties of QoS traffic. The TCP upstream throughput (TCPupT) was measured for various SNR observed. An Infrastructure based IEEE802.11b WLAN system having networked computers on which measurement software were installed,...
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