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Content-addressable memory (CAM) is the hardware based particular type of memory device utilized for low power and high-speed application. CAMs are developed for precise application without sacrificing their search speed, and it is much faster than random accessmemory (RAM) in search application. CAM executes two essential functions storing and comparing. The additional circuitry during comparison...
Approximate or inexact computing has recently attracted considerable attention due to its potential advantages with respect to high performance and low power consumption. This paper presents the design of an approximate multiplier; this approximate multiplier consists of an approximate Booth encoder, an approximate 4-2 compressor and an approximate tree structure. The approximate design is implemented...
With the advancement of technologies, interconnect circuits are shrinking dramatically. Capacitances of interconnects are increasing due to minimized wire size and inter wire spacing. As a result, interconnect power consumption, delay, and crosstalk are increasing significantly, which is affecting overall interconnect performance. Various techniques such as buffer insertion, shielding, skewing, and...
In this paper we are going to study Array multiplier, Wallace multiplier, Bypassing multiplier, Modified Booth multiplier, Vedic multiplier and Booth recorded Wallace tree multiplier which have been proposed by different researchers. When the study of the various multipliers have been performed, Array multiplier is found to have the largest delay and large power consumption while Booth encoded Wallace...
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...
We investigate the performance of delay constrained data transmission over wireless networks without end-to-end feedback. Forward error-correction coding (FEC) is performed at the bit level to combat channel distortions and random linear network coding (RLNC) is performed at the packet level to recover from packet erasures. We focus on the scenario where RLNC re-encoding is performed at intermediate...
Our paper presents solutions using erasure coding, parallel connections to storage cloud and limited chunking (i.e., dividing the object into a few smaller segments) together to significantly improve the delay performance of uploading and downloading data in and out of cloud storage. TOFEC is a strategy that helps front-end proxy adapt to level of workload by treating scalable cloud storage (e.g....
Network coding (NC) has been shown to improve the throughput of multi-hop wireless networks (MWN). Prior work on performance modeling of NC mainly addresses the maximization of throughput. However, these works fail to capture the complete picture since there may be paths in the network for which end-to-end packet delay is prohibitively high. In this paper, we address the problem of delay minimization...
Advanced motion vector prediction (AMVP) is one of the most important inter prediction coding tools adopted in the state-of-the-art HEVC coding standard, which does great effect on the coding efficiency. However, the current AMVP design is highly sequential and thus restricts the throughput both on the encoder and the decoder sides. To facilitate the parallel processing and enlarge the throughput,...
This paper introduced a camera surveillance system in wireless communications. The system contains three major modules, PTU (pan-tilt unit) camera control for surveillance video capture, cross-layer control for data compression and transmission, and error concealment for video quality enhancement. Our contribution is twofold. First, a system design for data collection and transmission over wireless...
In this paper, we analyze the effect of time-varying channels to video codec buffer specially for low-delay applications. We derive the sufficient conditions under which an encoder can design a bitstream for any time-varying channel without decoder buffer overflow and underflow. We then apply those conditions to design a bandwidth adaptive rate control in x264 and test it under LTE simulator. Our...
Significant progress has happened to the research field of passive chipless RFID since it is beneficial in various applications but in terms of encodable information content it lags far behind the chip-based counterparts. Novel approaches tend to implement higher-order modulation to overcome this situation. This work presents a straight forward approach for implementing a reliable higher-order modulation...
In systems employing feedback-based error resilience, error propagation can significantly degrade visual quality when feedback delay is in the order of a few seconds. We propose a coding structure based on multiple description coding that mitigates error propagation during feedback delay, and uses feedback to adapt its coding structure to effectively limit error propagation. We demonstrate the effectiveness...
With shrinking of Integrated Circuits feature sizes, the separation between the wires decreases which causes the coupling capacitance to increase, which in turn increases the crosstalk between the wires. The on-chip crosstalk causes, power consumption of interconnects and delay to increase. As the complexity of integrated circuits increase, the bus width increases, this causes the signal integrity...
Network coding has been studied to enhance reliability and robustness of communications in lossy environments such as high mobile tactical situations. Previous network coding research has exploited on-demand multipath routing, multicasting, or broadcasting to leverage spatial redundancy and improve communication performance. However, one should not ignore proactive routing protocols such as link state...
Supporting effective and efficient data delivery in delay tolerant networks (DTNs) is a challenging problem due to the nature of the network. In this paper, we propose to use network coding technique based on Growth Code to improve the performance of data delivery in DTNs. We incorporate Growth Codes into Epidemic Routing and First Contact routing in DTNs to provide two network coding based routing...
Recently, the rapid development of VoIP has attracted considerable attention. However, VoIP service exposes weakness on voice quality such as delay and jitter. So it is helpful to improve the quality of VoIP service by mitigating time latency and jitter. In this paper, VoIP phone is implemented by open source software components using the Session Initiation Protocol (SIP) based on embedded systems...
Instead of applying physical techniques to prevent crosstalk on off-chip parallel data buses, another approach is to code the sent information, [1]. Through developing of a crosstalk avoidance code (CAC) is possible to create a forbidden transition channel (FTC) that prevents transitions responsible for generating crosstalk, [2]. Rules used in developing a CAC can be very complex, and because of that...
Vehicular Delay Tolerant Networks (VDTN) are used to distribute a large amount of mobile data by high-capacity device-to-device communication. Given a number of available vehicles in VDTN, the current vehicular data sharing models always utilize all of them to achieve the best effect, failing to balance the performance gained and cost of employing them. Taking the cost into account, we study the problem...
With the emergence of Ethernet as a convergence layer in access network, Ethernet Passive Optical Network (EPON) has evolved. It is being considered as a promising solution to the “last mile” problem in next-generation broadband access network. An EPON is a point-to-multipoint tree topology, which carries 802.3 Ethernet frames between an optical line terminal (OLT) and multiple optical network units...
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