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For increasing network bandwidth and guaranteeing quality of service, the 4G networks proposes the techniques of MIMO and OFDMA. However, the performance of the 4G specifications is significantly degraded in the high-mobility environment and high communication interference. As a result, a sender easily uses inaccurate modulation and coding scheme (MCS) and improper power allocation for different-priority...
MPEG is currently developing a standard titled Compact Descriptors for Visual Search (CDVS) for descriptor extraction and compression. In this work, we report comprehensive patch-level experiments for a direct comparison of low bitrate descriptors for visual search. For evaluating different compression schemes, we propose a dataset of matching pairs of image patches from the MPEG-CDVS image-level...
Symbolic encoding for resource allocation, task binding, and message routing during multi-objective design space exploration (DSE) has gained significant attention in recent years. To determine the message routing, existing symbolic approaches typically rely on an explicit encoding of routing hops which results in a huge number of required variables and/or constraints. As a result, these approaches...
Resource allocation for a downlink orthogonal frequency division multiple access (OFDMA) system ensures that capacity and throughput are maximized. In the literature, either channel coding is not considered or only a fixed code rate is specified. To overcome this problem, an optimized cross-layer resource allocation strategy that distributes the user, bit and power optimally has been proposed for...
Safety and efficiency are the fundamental requirements of China Railway High-speed and its maintenance. And the maintenance time of CRH is short, and is subject to the constraint of time. So reasonable CRH maintenance plan and rational allocation of staff are proved to be critical. This paper first gives a mathematical description of the problem and establishes a model. Then it uses the virus genetic...
In this paper, a spectrum sharing strategy in cooperative cognitive radio network (CCRN) is investigated. Specifically, a multi-phase cooperation architecture is proposed including cooperation partner selection and spectrum sharing among secondary users (SUs). The cooperation partners who are selected from SUs forward the data of primary users (PUs), and then acquire the spectrum access opportunities...
This paper introduces an efficient and fair bandwidth allocation strategy called fair service for multiuser multimedia communication over Heterogeneous Networks. Its purpose is to fairly allocated bandwidth to all the users with different video service characteristics and ensures their efficiency at the same time. The proposed fair service bandwidth allocation strategy is formulated as a convex optimization...
In this paper we address the problem of compressing a collection of still images of the same type, such as an image database of faces or any other visual objects of similar shapes. We refer to such collection of images as an image ensemble. The compression of image ensembles presents a unique set of requirements such as random access to any image within the collection without the need to reconstruct...
We address the problem of multiuser power and bandwidth allocation for a general class of OFDMA-based wireless networks that employ a Type-II Hybrid Automatic Repeat reQuest (HARQ) transmission scheme. We assume that the resource manager has only statistical knowledge of the Channel State Information (CSI) of the Rayleigh-distributed fast-fading links forming the network. We then propose the optimal...
To maximize the reliability of erasure coded objects in cloud storage, the optimal allocation is a challenging problem constrained with the node heterogeneities and erasure coding budgets. We model the optimal problem from a combinatorial view under multiple constraints and propose an efficient search algorithm to find the most reliable allocation. The experiments are evaluated and analyzed including...
We consider wireless caches placed in the plane according to a homogeneous Poisson process. A data file is stored at the caches, which have limited storage capabilities. Clients can contact the caches to retrieve the data. The caches store the data according to one of the two data allocation strategies: partitioning & coding. We consider the Pareto front of the expected deployment cost of the...
In 802.16m network, mobile station can choose different transmission schemes: direct transmission, cooperative transmission, or cooperative network coding transmission. Different transmission scheme has different effects on network performance. Particularly relay selection method affects network throughput and the amount of network resource for cooperative transmission and cooperative network coding...
This paper proposes an advanced distributed resource allocation scheme for device-to-device (D2D) communication using loose network-assistance, namely distributed interference channel based resource allocation (DICRA). The MAC/PHY protocol of the proposed DICRA is described and the performance advantage over FlashLinQ is confirmed from computer simulation results.
Wireless relay and network coding are two critical techniques to improve the reliability and increase the throughput for wireless cooperative communications. In this paper, the performance analysis is presented at first to highlight the optimized coding coefficient and power design in wireless relay cooperative transmission system with complex field network coding (CFNC) plus relay selection. It is...
The capacity of the K-user fading multiple access channel with multiple antennas and common information is approximately characterized. In this model, any possible common message may exist. While the exact capacity appears to be difficult to characterize, it may be attained to within a gap independent of the power allocation by a simple separable coding scheme.
This paper proposes a downlink mapping algorithm for two-level requests in Orthogonal Frequency Division Multiple Access based IEEE 802.16e systems under the Adaptive Modulation and Coding (AMC) mode by which the modulation and coding scheme (MCS) of a user may be different for available subchannels. Given a set of requests each with two priorities, the proposed algorithm efficiently allocates a two-dimensional...
With the increasing number of mobile terminals, the capacity of cellular network can hardly satisfy the user requirement in the future. In next generation cellular systems, heterogeneous network is proposed to improve the spatial spectrum efficiency. In this paper, we study a joint coding scheme to increase the achievable sum-rate of multi-carrier heterogeneous systems, where we introduce transmission...
With rapid growing of wireless data service, heterogeneous network (HetNet) has evolved as an spectrum and energy efficient cellular network architecture. However, the inter-cell interference (ICI) between the macro-cell and small cells is complicated. Due to the transmit power difference between various nodes and the randomness of user locations, the network may work in strong, mixed or weak interference...
Register allocation is one of the most time-consuming parts of the compilation process. Depending on the quality of the register allocation, a large amount of shuffle code to move values between registers is generated. In this paper, we propose a processor architecture extension to provide register file permutations by which the shuffle code can be implemented more efficiently. We present compiler...
We derive an optimization framework for joint view and rate scalable coding of multi-view video content represented in the texture plus depth format. The optimization enables the sender to select the subset of coded views and their encoding rates such that the aggregate distortion over a continuum of synthesized views is minimized. We construct the view-rate scalable bitstream such that it delivers...
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