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Recent literature shows that the performance of a bus with crosstalk is improved using a multi-threshold capture mechanism with the trade-off on the noise margin. This work proposes a method to generate error correction code suitable for multi-threshold receivers to circumvent the noise margin trade-off. The overhead of the proposed technique is significantly less than existing encoding techniques...
Although web services have been espoused due to their many benefits, it is known that overhead delay, particularly the communication delay, associated with invocation and execution of web services is high. Consequently, much research has been expended on minimizing those delays. In many situations an application invokes a web service repeatedly such that some or most of the data returned by the web...
There has been extensive work that relies on network coding to increase the resiliency to errors and consequently improve the performance of wireless networks. However, due to the coding operations, these network coding techniques often introduce an additional delay that has a negative impact on TCP traffic. A recent approach, namely online coding, proposes a feedback mechanism for TCP that acknowledges...
This paper presents a practical and general coder and decoder of network coding (NC) with HDL (Hardware Description Language) logic for wire-speed nodes in multisource multicast networks. The NC coders apply random linear network coding (RLNC) and the decoders recover the original packets by Cramer's rule. All these mathematical operations are carried out in the Galois Field (256). The structures...
ARQ for network coding (ANC) can effectively improve the throughput and reliability of transmission. The properties of ANC are analyzed from three different delay definitions which are seeing delay, decoding delay and delivery delay, respectively. Without perfect feedback information, a novel network coding scheme with lossy and delayed feedback (NCLDF) is developed in this paper. Simulation results...
In this paper we introduce a new network coding-based network protection strategies against link failure, which is based on prediction of data traffic. In the situation that extra backup links are not applicable, we assign protection packets to the path which would have a low traffic by the prediction. The simulation result shows that using the new strategy, the average queuing delay of packets can...
Network coding has gained significant attention by improving throughput and reliability in disruptive MANETs. Yet, it is vulnerable to attacks from malicious nodes. In order to prevent malicious attacks, we have explored the use of secure network coding schemes based on homomorphic properties of cryptographic systems. While homomorphic methods, especially those based on public key cryptography, provide...
in order to achieve the reliable decoding when the real-time video compression bit streams are transmitted in radio channel, the effective channel code method is given. It is based on the Turbo product codes with AHA4501. The performance of its delay time and error correction is evaluated. The selection of block size, the iteration number and frame sync header and is described. And the method has...
There have been many research works studying the network coding delay, assuming single network coding point or single hop between source and destination. In this paper, we analyze intensively the network coding delay for a multi-hop path between source and destination along which multiple coding points are permitted to reside. Firstly, extending the previous works we develop a numerical form of the...
Routing in delay tolerant networks (DTNs) is challenging due to their unique characteristics of intermittent node connectivity. Different protocols (single-copy, multi-copy, erasure-coding-based etc.) utilizing store-carry-and-forward paradigm are proposed to achieve routing of messages in such environments by opportunistic message exchanges between nodes that are in the communication range of each...
One method for reducing the decoding complexity of network coding in wireless broadcast systems is to generate sparse encoding vectors. The problem of finding the minimal Hamming weight of innovative encoding vectors over large finite field is formulated. By reducing the problem of hitting set to it, we show that the problem is NP-hard. However when the number of users is fixed, the problem can then...
Double-LSB and signed-LSB have been recently proposed as efficient encodings for addition and multiplication in the modulo 2n+1 and 2n±1 channels respectively of a Residue Number System (RNS). In this paper we introduce reverse converters for two 4-moduli sets that adopt these encodings and analyze their efficiency. The theoretical and experimental results that are derived indicate that the area and...
We consider the design of an efficient streaming system for live video over peer-to-peer networks. Such a system must accommodate for large populations of heterogeneous users, behave robustly irrespective of user dynamics and ensure prescribed levels of quality of experience. Seeking a solution capable of addressing also the lack of incentives for peer-to-peer collaboration and the scarcity of certain...
The cooperation among the secondary users or among the secondary users and the primary users have proven to bring many benefits to both primary and secondary users in cognitive radio networks. In this paper, cooperative relaying in cognitive radio networks is studied for rateless coding error-control mechanism. For a pair of primary transmitter and receiver, we find the region in which any secondary...
Physical-layer cooperation allows leveraging the spatial diversity of the wireless channel without requiring multiple antennas on a single device. However, most research in this field focuses on optimizing physical layer metrics, with little consideration for network-wide and application-specific performance measures. This paper studies cross-layer design techniques for video streaming over cooperative...
This paper proposes XOR-BiDO, a data delivery scheme (DDS) suited for multihop underwater acoustic networks characterized by regular bidirectional traffic streams. DDSs for multihop underwater networks usually assume a single-sink configuration, where most of the transmissions flow in a single direction. Throughput performance decreases and fairness suffers when such DDSs are subjected to heavy bidirectional...
In ultra-deep submicron technology, minimizing the propagation delay and power consumption on buses is two of the most important design objectives in system-on-chip (SOC) design. Crosstalk between adjacent wires on the bus may create a significant portion of propagation delay. Elimination or minimization of such faults is crucial to the performance and reliability of SOC designs. In this paper, we...
Adaptive modulation and coding (AMC) has been widely used to improve the spectral efficiency. In this paper, we take a different look at it from energy saving point of view. Specifically, we analyze the queuing behavior of AMC systems jointly with sleep mode where the wake-up process incurs time and energy cost. We formulate the optimization problem by jointly considering energy-efficiency, queuing...
Internet protocol (IP) based media delivery enables applications such as Voice over IP or, most recently, stereoscopic HD-TV. Suchlike transport of typically time-constrained media between two end-points has a number of important characteristics, both on the transport and content side. We focus on live streams of audio-visual data that are assumed as time-constrained and loss-tolerant. We aim at optimizing...
In this paper, we consider the problem of minimizing the broadcast completion delay for instantly decodable network coding with limited feedback. We first extend the stochastic shortest path formulation of the full feedback scenario in [1] to the limited feedback scenario. We then show that the resulting formulation is more complicated to solve than the original one but has its same properties and...
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