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In smart cities, wireless multimedia sensor networks (WMSNs) and mobile cellular networks (MCNs) play an important role in surveillance and management of living environment, i.e., structural health of buildings, urban transportation, and potential locations of future crime, etc. In WMSNs, the camera sensors (CSs) can capture multimedia contents from particular areas, packetize and transmit them to...
In wireless multimedia sensor networks (WMSNs), multimedia contents from remote areas are captured by camera sensors (CSs) and sent to data center via cluster heads (CHs) and base stations (BSs) for the purpose of monitoring. The problem in WMSNs is that enabling multimedia streaming, e.g., video streaming, demands high quality and consumes considerable bandwidth and energy resources, meanwhile, the...
In emergency scenarios, e.g., natural disasters, the infrastructure of telecommunication system is partially or even completely disrupted. While the bandwidth and energy resources of system are limited, the maltimedia communication demand of myriad usen may reach the peak of data traffic. This in tum makes the system more challenging to serve the users high quality of maltimedia streaming with con...
The proliferation problem of video streaming applications and mobile devices has prompted wireless network operators to put more efforts into improving quality of experience (QoE) while saving resources that are needed for high transmission rate and large size of video streaming. To deal with this problem, we propose an energy-aware rate and description allocation optimization method for video streaming...
The performance of a cognitive radio (CR) system depends on how to optimally allocate available resources (e.g., bandwidth, subcarrier and power) of a free frequency band without causing any interference to the primary user (PU). We consider a secondary usage of spectrum scenario with the coexistence of primary and secondary users. For such a system, we study the problem of optimizing subcarrier and...
In this paper, we focus on the physical layer secrecy performance analysis of Ultra Wideband system consisting of a multi-antenna transmitter using transmit antenna selection and single antenna receiver, in the presence of a single antenna passive eavesdropper over Rayleigh fading channel. Specifically, the exact closed-form expressions of probability of existence of secrecy capacity and the secrecy...
Video on-demand service (VoDs) over broadband wireless Internet have become well-known and increasingly attractive to users. The huge number of users and the limited resources of media servers and wireless channels make VoDs more challenging to serve the users high quality of video streaming applications. In this paper, we introduce and analyze an optimization problem used for replication strategy...
Electromechanical Wave Imaging (EWI) is a novel ultrasound-based imaging modality for the mapping of the electromechanical wave (EW), i.e., the transient deformations occurring in immediate response to the electrical activation. The correlation between the EW and the electrical activation has been established in canines in previous studies. However, the methods used previously to map the EW required...
The basic structure of the Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) Ultra-Wide Band (UWB) System is discussed in this paper. The fixed-point simulation platform using the WiMedia Alliance proposed by ECMA 368 standards has been implemented. An extension of the physical layer using the Alamouti method to a Multiple-Input Multiple-Output (MIMO) system is also presented. Based...
Recently, ultra-wideband (UWB) is one of the most attractive technologies in communications. UWB communication systems are designed to intent to low power, low cost, and low complexity devices. However, costly high-speed analog-to-digital converters (ADCs) is required to convert RF/IF signals to digital form for subsequent baseband processing in UWB system. By exploiting sparse property of UWB signal,...
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