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Given the widely adoption of screen and camera in many electronic devices, the visible light communication (VLC) over screen-to-camera channel emerges as a novel short range communication technique in recent years. Active research explores various ways to convey messages over screen-camera channel, such as barcode and unobtrusive optical pattern. However, with the prevalence of LED screens of wide...
The proliferation of mobile devices and ubiquitous access of the wireless network enables many new mobile applications such as augmented reality, mobile gaming and so on. As the applications are latency sensitive, researchers propose to offload the complex computations of these applications to the nearby mobile edge cloud, in order to reduce the latency. Existing works mostly consider the problem...
In this paper we present a decision feedback channel estimation way for the mobile satellite communication system in order to improve the bit error performance. The transmission is disturbed not only by shadowing and multipath effects and additive white Gaussian noise, but also by the weather attenuation. The conventional Least Square(LS) is not well suited to detect the transmitter sequence, whereas...
In order to solve the problem of introducing additional Total Degradation (TD) in adaptive satellite system caused by fixed High Power Amplifier (HPA) operating point, the paper proposes an adaptive HPA Input Back-Off (IBO) algorithm carried out on the gateway side in the Forward Link of the system based on Adaptive Coding and Modulation (ACM) techniques. On the other hand, the traditional way of...
Due to the various applications for smartphones, mobile data traffic is growing at an unprecedented rate. The cellular network is suffering from traffic overloaded currently. Offloading part of the cellular traffic through opportunistic contact between mobile devices is a promising solution to solve the overload problem. However, due to the uneven distribution of devices and regular mobility of smartphone...
Cellular networks are now facing severe traffic overload problems due to the explosive growth of mobile data traffic. One of the promising solutions is to offload part of the traffic through WiFi. In this paper, we investigate an oligopoly offloading market, where several Mobile Virtual Network Operators (MVNOs) compete to serve end users using the network infrastructure leased from the host Mobile...
The routing efficiency in Delay Tolerant Networks (DTN) with social characteristics degrades owing to intermittent connection and high latency. Additionally, congestion is another issue because of the limited resources of nodes. To solve these problems, an improved Socially Aware Congestion Control algorithm (SACC) is proposed. In this algorithm, the social features and the congestion level of the...
Video telephony is increasingly being adopted by end consumers. It is extremely challenging to deliver video calls over wireless networks. In this paper, we conduct a measurement study on three popular mobile video call applications: Face-Time, Google Plus Hangout, and Skype, over both WiFi and Cellular links. We study the following questions: 1) how they encode/decode video in realtime under tight...
Abstract-Mobile terminals provide an increasingly important communication channel in facilitating social connections. Mobile social networking has an enormous potential for us to tap and there is an urgent need to explore new service modes in this area. We have developed a system of social interaction, called Mobile Hunter System, for people to expand their scope of interpersonal relationships not...
Routing is one of the most challenging open problems in pocket-switched-networks (PSN). In this paper, we propose a novel co-route media content forwarding scheme (CRMF), in which new contact opportunities are created for occasionally disconnected mobile users. Our study is inspired by two observations: one is that many people tend to make regular journeys to the same place, so their trajectories...
This paper investigates the use of ATSC M/H digital television (DTV) signal for location finding. In comparison to satellite based location finding system, DTV signals have higher field strength, wider bandwidth, lower frequency band, and DTV transmission towers are pervasively available everywhere. They can be used for indoor and mobile location finding in major cities where satellite based system...
This study introduces a wireless scheme to solve the coverage problem in carriages of Chinese High Speed Railway (CRH) trains. In the proposed scheme, digital TV programs can be retransmitted by CMMB (China Mobile Multimedia Broadcasting) transmitters after being transmitted from the base stations to the trains. The in-car channel profile is analyzed and presented. And the modified linear minimum...
The ATSC A/110 standard specifies a transmitter identification (TxID) system using RF water-mark. The system, using a 16-bit Kasami sequence, can identify up to 16 millions DTV Transmitters. With the recent development of the ATSC Mobile DTV (M/H), the implementation of transmitter identification will enable new capabilities to receivers in mobile environment. In this paper, we investigate the TxID...
This paper presents the experimental services and trial test of China Mobile Multimedia Broadcasting (CMMB) system. Combined with the comparison with another popular mobile TV standard DVB-H, the system infrastructure and key techniques of CMMB are introduced. We describe the coverage deployment of CMMB based on the existing trial test reports. Some aspects of its services in China are depicted. It...
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