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Recently, Intra Line Copy (ILC) and Intra String Copy (ISC) have been introduced as effective means for screen content coding during the development of HEVC Screen Content Coding Extensions. Although conceptually sharing the same theoretical basis, which is essentially string matching, they differ from each other in a number of significant ways. This paper presents detailed comparisons between them...
Cloud storage is an important service of cloud computing where the data owners store their data in cloud servers so that users can access the data from cloud servers anywhere irrespective of their device and location such as thin clients with limited memory capabilities, CPU and limited bandwidth. The owners can also reduce the maintenance and burden of cloud storage. However this cloud storage is...
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...
Video object recognition is an importance topic in both defense and civilian applications. However, object recognition guarantee is not considered in current video coding standard H.264. For this issue, experiments based on H.264/AVC codec are designed to measure the affection of coding parameters on recognition performance. The quantitative functions of recognition performance with coding rate and...
With the rapid development in internet and video coding technology, applications such as telesurgery and remote operations are becoming more and more popular. In such applications, any delay will significantly lower the performance and may sometimes lead to catastrophic results. As a result, low-delay video streaming is demanded in such applications. Previous works have explored and established several...
Data movement over long on-chip interconnects is a major contributor to system energy. This paper presents novel signaling and encoding techniques that toget her improve the energy efficiency of data communication between the processor cores and the last level cache. The proposed techniques make the interconnect energy proportional to the number of ones in the transferred data block (i.e., the block's...
A data reconstruction scheme for the storage code that possesses the combination property (CP) and zigzag decod-able (ZD) is proposed for distributed storage system. (n, k) CP is defined as follows: k message with each containing L bits are encoded to n ≥ k packets and then stored into n storage nodes, respectively. Any k from these n storage nodes can recover the original message. The code operates...
As technology scales and VLSI systems become more and more complex, both bus and crossbar-based architectures are no longer suitable for implementing communications between the system components. Thus, a specific NoC is needed so as to meet the user-defined constraints (area, bandwidth, energy dissipation) while ensuring system reliability. The NoC design flow which is presented in [1] addresses related...
In this paper, we propose a frequency coding waveform with segment linear frequency modulation (LFM) signal for the multiple-input multiple-output (MIMO) radar. This new waveform is modified from the discrete frequency coding waveform with LFM (DFC-LFM) by changing the subpulse from the LFM signal to segment LFM and extending the contiguous waveform to a pulse train. Compared to the existing frequency...
Erasure-coded storages provide data reliability for big data archiving and backup with high storage efficiency. However, erasure code generates a large amount of data transmission traffic in both encoding (write) and decoding (repair) which costs substantial bandwidth in the network. Most of the existing work focus on the decoding cost due to the importance of data repair, but unfortunately overlooks...
It is indispensable to speed up a reconstruction process in erasure-coded storage clusters, because a fast data recovery helps to shorten the vulnerability window while improving storage system reliability. To address double- and multiple-node failures, this paper proposes a cooperative reconstruction pattern - CoRec - to minimize reconstruction traffic. CoRec not only enables all rebuilding nodes...
Erasure codes are widely used in distributed storage systems to prevent data loss. Traditional erasure codes suffer from a typical repair-bandwidth problem in which the amount of data required to reconstruct the lost data, referred to as the repair bandwidth, is often far more than the theoretical minimum. While many novel erasure codes have been proposed in recent years to reduce the repair bandwidth,...
An information flow problem discusses how to transport information over a complicated network. It is known that a linear network code plays an essential role in a certain type of information flow problems, but it is not understood clearly how contributing linear network codes are for other types of information flow problems. One basic problem concerning this aspect is the solvability of information...
In this paper, a novel motion estimation (ME) scheme with efficient memory design is presented for the mobile multimedia applications in H.264/AVC. To obtain the optimal memory usage and achieve better coding quality under volatile system operating conditions, we propose a novel bandwidth-rate-distortion (B-R-D) algorithm by exploring the motion activity properties of various video sequences. This...
At reduced bitrates, the audio compression affects high frequency tonal components of signals, which results in a roughness phenomenon. Audio coders are limited in the reconstruction of the high-frequency spectrum mainly because of the potential unpredictability of the structure of the latter, as well as unprecise indicators of tonal to noise ratio. We propose a technique for high-frequency tones...
In Recent times Wireless sensor network (WSNs) has become one of the most interesting networking technologies since, it can be expanded without communication infrastructures. Wireless sensor network face certain limitations such as power, data redundancy and high bandwidth requirement when used for multimedia data .The researchers have focused on the video encoding at the multimedia sensors side,...
Delay performance is crucial in distributed storage systems and it can greatly impact user experience. Both direct and k-access reads are common in storage systems. However, much of previous research only considers k-access reads and many schemes, such as Redundant Scheme, are only shown to reduce delay for k-access reads. We have no idea whether those existing schemes can also work for direct reads...
An index coding scheme in which the source (transmitter) transmits symbols over a wireless fading channel is considered. Index codes with the transmitter using minimum number of transmissions are known as optimal index codes. Different optimal index codes give different performances in terms of probability of error in a fading environment and this also varies from receiver to receiver. In this paper...
Ultra-Wideband (UWB) systems are essential to realizing software defined and cognitive radios. Concurrently advancements in digital hardware and signal processing technologies have drastically reduced the realization complexity for such systems. Recently, a novel on-site coding receiver (OSCR) architecture was proposed to significantly reduce the intense hardware requirement for digital beamforming...
In this paper we propose a novel co-allocation scheme, called a Reliable Multicast Brute-Force co-allocation scheme (ReMBF for short), which employs a reliable multicast (RM for short) technique with the Brute-Force (BF for short) scheme to accelerate data retrieval and delivery, and reliably transmit data to its users for data grids. Several types of data access patterns, including Zipf-like, geometric,...
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