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Efficient Multimedia Broadcast and Multicast Services (MBMS) to heterogeneous users in cellular networks imply adaptive video encoding, layered multimedia transmission, optimized transmission parameters, and dynamic broadcast area definition. This paper deals with MBMS by proposing a multi-dimensional approach for broadcast area definition, which provides an effective solution to all of the above...
The topic model based on latent Dirichlet allocation relies on the prior statistics of topic proportionals for multinomial words. The words in a document are modeled as a random mixture of latent topics which are drawn from a single Dirichlet prior. However, a single Dirichlet distribution may not sufficiently characterize the variations of topic proportionals estimated from the heterogeneous documents...
The spectrum utility can be improved when cooperative communication technology is incorporated into cognitive radio network, and both the licensed users and secondary users can benefit from cooperating. In this cooperative cognitive radio network, a primary user and multiple secondary users cooperate with each other adopting space-time coding relay scheme to benefit win-win cooperation. Considering...
This paper concerns minimizing the expected distortion of a Gaussian source, transmitted over a two-hop block fading channel, under the mean square-error measure. It is assumed that there is not a direct link between the source and destination, and a simple Decode and Forward (DF) relay, handles the communication. The channel state information (CSI) associated with each hop is available at the corresponding...
In this paper, we consider the problem of sending a bivariate correlated Gaussian source through a two-user Gaussian orthogonal multiple-access channel (MAC), where each encoder observes a noisy version of one of the source components, and the receiver aims at reconstructing each source component. The estimation quality is measured by mean-squared error (MSE) distortion criterion. Different components...
Optimal rate allocation is among the most challenging tasks to perform in the context of multi-view video coding, because of the dependency between frames induced by motion compensation and depth image-based rendering. In this paper, using a recursive rate-distortion model that explicitly takes into account these dependencies, we approach the frame-level rate allocation as a convex optimization problem...
To enable robust multiview video streaming over current wireless broadcast infrastructures, this paper proposes a joint source and channel coding optimization framework for video streaming based upon multiview video coding technique. It utilizes random linear coding (RLC) with ladder-shaped global coding coefficient matrix (GCM) for unequal erasure protection. An accurate expression of the decoding...
In this paper, we address the problem of the statistical multiplexing of video streams. Dynamic bitrate allocation is used to improve the overall video quality of a pool of channels. The balance is obtained by providing more bits to complex channels, while deprivations are applied to non-complex ones. In this study, the error minimization optimization of several compressed video is considered along...
This paper considers the problem of sensor selection for the estimation of a stochastic source, being the sensor nodes powered by energy harvesting. Therefore, the interest lies in selecting the subset of most informative sensors that transmit their observations to a fusion center (FC). To that end, we propose to minimize the attained distortion at the FC plus a penalization term that promotes sparsity...
Direct sequence spread spectrum (DSSS) is an optimal mode of coding for data communication. Spread spectrum coding were used in various communication modes, which gives an advantage of channel interference minimization, with maximum spectrum utilization. With the simplicity in coding efficiency, this coding approach was most effectively used in various application of data exchange. However, with the...
Distributed self-organising systems often face conflicts if more than one entity tries to access a limited resource. In order to solve this conflict, research focuses on techniques for resource allocation considering different priorities. In this paper, we propose to tackle the decision problem of whom to assign the resource by means of a co-evolutionary approach. We investigate appropriate fitness...
To date, most resource allocation proposals in elastic optical networks have focused either on routing and spectrum assignment (RSA, assuming fixed coding scheme and modulation format) or routing, modulation level and spectrum assignment (RMLSA, assuming a fixed coding scheme). Recent research has studied the impact of adaptive assignment of the code rate, without adapting the modulation format (RCSA...
Computing resources of Smart Space can be utilized to improve the spatial processing capabilities of other smart devices effectively. Multi-agent model based on UPnP (Universal Plug and Play) makes resource management agent discover computing resources dynamically and retrieve device information. SOA (Service-Oriented Architecture) based on WCF(Windows Communication Foundation) makes virtual services...
Due to limited computational capability in handheld devices, complexity constrained video coding draws great attention in recent years. In this paper, a complexity scalable mode decision algorithm is proposed for complexity control of HEVC. First, complexity is properly mapped to a target in terms of prediction modes. Then a mode decision algorithm is proposed through statistics to get the optimal...
In this paper, we focus on improving the performance of a two-way relay network consisting of two end nodes and multiple relays. It is assumed that the system utilizes multiple access broadcast as the transmission protocol and decode and forward as the relaying protocol. The performance metric of the system is outage probability and we try to improve it by creating diversity gain and coding gain....
In this paper, we are interested in the optimal redistribution of the available budget in average transmit power per packet among potential packet transmission attempts for improved Automatic Repeat reQuest (ARQ) protocol. A conventional ARQ protocol was combined in [5], with both Adaptive Modulation and Coding (AMC) and Power Control (PC) to improve spectral efficiency, while satisfying an average...
A new study item termed downlink Multiuser Superposition Transmission (MUST) has been established in 3GPP Release 13 [1]. As the name suggests, MUST utilizes the concept of superposition coding for a multiuser transmission in LTE-Advanced (LTE-A) systems. While superposition coding can be applied at symbol level, the symbol-domain superposition coding not only increases network signaling overhead...
Intellectual property (IP) cores have emerged as a promising solution to the challenges of future design as well as mounting time to market pressure. However, due to increasing globalization of design supply chain, possibility of intervention and typical attacks is on the rise, which therefore mandates protection of IP cores from piracy/counterfeiting even at behavioral level. This paper presents...
In this paper, we consider video communication over fading channel, where the perfect instantaneous channel state information (CSI) is available at both sender and receiver. Most of existing coding schemes are inefficient in this communication scenario. The reason is that for digital coding scheme, it has high coding efficiency but unavoidably leads to the cliff effect; while for analog scheme, it...
The development of wireless technologies makes telemedicine more and more popular. However, due to the broadcast and openness nature of radio propagation, it makes the image transmitted over wireless channel much easier to be eavesdropped. Moreover, delay requirements is another concern in most application scenarios. To deal with the security issue, a secure scheme for wireless image transmissions...
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