The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper proposes a cost-aware opportunistic relaying scheme to minimize total cost in decoding and forwarding (DF) relay networks with power constraints. In the proposed scheme, a relay is selected such that it costs minimally among relays which correctly decode the signal from the source and have sufficient power to transmit the signal to the destination. We derive the outage probability and the...
According to increase of multimedia applications such as video surveillance and environment monitoring in Wireless Multimedia Sensor Networks (WMSN), energy conservation and prolonging network lifetime become increasingly important. Therefore, energy conservation and maximization of system lifetime are commonly recognized as a key challenge in the design and implementation of WMSNs. In these networks,...
Cooperative multiple-input-single-output (CMISO) introduces cooperative nodes (Coops) to reduce the energy consumption of the cluster head (CH) in cluster-based M2M capillary networks. Although CMISO reduces energy consumption of CH, it introduces additional energy overhead to Coops, which contributes to a reduction of network lifetime. In this paper, we propose a joint CH and Coops selection (JCCS)...
Advances in wireless communication techniques enable pervasive and ubiquitous video applications. Among different factors concerned, energy efficiency is one of the most challenging issues in multimedia communication due to huge data traffic. Dynamic bursty interference sourcing from transmission of best effort service can make the Signal-to-Interference-plus-Noise-Ratio (SINR) of video traffic fluctuate...
In Multilevel Polarization Modulation (MPM), the abrupt switching among the discrete Sates of Polarization (SOPs) brings discontinuity of signal waveforms, which will broaden bandwidth and decrease the bandwidth efficiency consequently. To alleviate the problem, in this paper a Multilevel Continuous Polarization Modulation (MCPM) scheme is proposed with continuous SOP to produce continuous signal...
A novel quantize-and-forward scheme with two relays is proposed in this paper. In our scheme, each relay only processes one bit of the quantized codeword. The principle of selecting the aforementioned bit is based on the channel condition of the relay links. Compared with the single-relay scheme, the system consumes the same resources, while each relay has a prolonged life since it only transmits...
The traditional personal computers have many security problems and are difficult to manage, thus desktop virtualization has been widely used due to its centralized management characteristic in solving the above issues [1]. In this paper we propose and discuss using Virtual SAN to enhance the performance of virtual desktop infrastructure. Using Virtual SAN can not only meet the requirement of virtual...
The Long Term Evolution (LTE) network provides high bandwidth, flexible modulation and coding scheme for emerging mobile applications. The issues of power saving and quality of services are very critical for the success of deployment of mobile applications. This paper presents a buffer aware scheduling approach to reduce power consumption while maintaining the receiving quality of video streaming...
This paper proposes an efficient low-complexity polyphase interleaving and inversion (PII) scheme based on enhanced parallel tabu search (TS) for the reduction of peak-to-average power ratio (PAPR) in space-frequency block-coded orthogonal frequency-division multiplexing (SFBC-OFDM) systems. PII is a technique that can significantly reduce the PAPR of SFBC-OFDM symbols by exchanging SFBC symbols between...
In this paper, a downlink multi-carrier cognitive radio (CR) network is considered. The CR network consists of one cognitive base station (CBS) and a set of secondary users (SUs) sharing the same spectrum with the primary user (PU). Chunk-based resource allocation is adopted where subcarriers are grouped into chunks for allocation to the SUs. The problem of chunk-based resource allocation under the...
Cognitive radio (CR) has been emerging as a new technology enabling unlicensed secondary users (SUs) to dynamically access licensed spectrum bands underutilized by primary users (PUs). Spectrum sensing plays an important role in CR systems to detect PU inactivity and the resulting spectrum holes that allow dynamic spectrum access by SUs. In most existing spectrum sensing schemes, dynamics of the channel...
This paper presents a method for optimizing OFDMA upstream scheduling in event monitoring applications related to IEEE 802.22 wireless regional area networks (WRANs). Upstream scheduling optimization is a trade-off between management transmission and data transmission in a frame. We provide analytical models to derive an optimum upstream schedule that maximizes the network performance in terms of...
Coding and decoding schemes are critical to the performance in wireless communication system. In Current coding scheme of LTE system, each transport block (TB) is segmented into several code blocks (CBs) which can be coded and decoded individually. If one of the CBs in a TB fails in decoding, the whole TB is required to be retransmitted. Channel estimation is very crucial for the correctness of the...
Multimedia security means protecting multimedia information and information systems from unauthorized access, use, disclosure, disruption, modification, inspection, recording and destruction. The “Video Copy Detection” system is based on detecting video copies from a video sample to avoid copyright violations. Video fingerprinting is one of methods for video copy detection, including steps of video...
We propose a variable multi-pulse pulse-position-modulation (VMPPM) system with a dimming control that combines the use of pseudo-orthogonal codes and MPPM. In VMPPM, r slots are selected from n MPPM slots and codes for data are generated in each selected r slot according to source data equation [bit/frame]. This enables VMPPM to achieve a higher data-transmission rate than the conventional variable...
As a major part of wireless network optimization, load balancing can make the BS's resource utilization more reasonable. This paper proposes a load-balancing strategy based on Coordinated Multiple Points (CoMP) transmission/reception among the Base Stations (BS). To use universally, different patterns of load-balancing based on CoMP are modeled and discussed. We define call blocking rate as the QoS...
With the development of social network services (SNS) and TV programs, an increasing number of viewers prefer to share their opinions about broadcasting contents on Facebook or Twitter. This makes TV viewing behavior become social. However, these services are mostly based on the relationships between friends, followings and followers, the transmission of TV comments in real-time will be blocked between...
Mobile sink has been a significant means to prolong the lifetime of Wireless Multimedia Sensor Networks (WMSNs). However, the mobility of the sink makes the modeling of the WMSNs lifetime a more complex issue. Considering the new properties introduced by a mobile sink, this paper proposed a novel model to define the lifetime of WMSNs with a mobile sink based on energy by taking into account the heterogeneity,...
In the paper, we address the influence of Head-of-line (HOL) blocking on real-time video streaming in wireless networks. We consider short channel failures when the probability of successful packet transmission to a station abruptly drops to a near zero value. In wireless networks, the duration of such channel failure intervals may reach some hundred milliseconds, making packets staying in the same...
Many simulation tools (e.g., NS-2) can examine the quality of service (QoS) of networks but cannot demonstrate the visual and auditory effects of wireless transmission on multimedia quality. This paper presents a wireless multimedia simulator (WMS), which uses a compact graphical user interface to present the real-time packet delay with the playback of streaming media over a wireless channel based...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.