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Throughput and per-packet delay can present strong trade-offs that are important in the cases of delay sensitive applications. We investigate such trade-offs using a random linear network coding scheme for one or more receivers in single hop wireless packet erasure broadcast channels. We capture the delay sensitivities across different types of network applications using a class of delay metrics based...
It was recently shown that the reverse carpooling technique can realize the benefits of network coding while requiring only a simple coding scheme that can be efficiently implemented in practice. However, when no opportunity for coding exists at an intermediate (relay) node, it needs to decide whether to transmit an uncoded packet or wait for the next opportunity to create a coded packet. While the...
This paper proposes new robust asynchronous interfaces for GALS-systems. A combination of delay-insensitive and error detecting/correcting codes is used to achieve two types of robustness: variation-tolerance and fault-tolerance. Concerning the delay-insensitive code this paper targets the well-known 4-phase dual rail code, frequently used in asynchronous circuit design. In order to enable an optimal...
In this paper, we analyze the coding delay and the average coding delay of Chunked network Codes (CC) over line networks with Bernoulli losses and deterministic regular or Poisson transmissions. Chunked codes are an attractive alternative to random linear network codes due to their lower complexity. Our results, which include upper bounds on the delay and the average delay, are the first of their...
This paper presents fundamental limits and practical schemes for managing data and feedback of coded flows over multiple, half-duplex communication interfaces (routes). We set forth closed-form bounds on the capacity of resource constrained routes. Our work also provides a systematic approach to exploit these bounds in order to solve the allocation of coded packets with a reliability constraint efficiently,...
A novel temporal multi-frequency encoding technique based on group delay for chipless Radio Frequency Identification (RFID) tag is presented. Cascaded microstrip transmission line sections coupled at alternative ends (C-sections) are utilized to generate the tag Identification (ID). C-sections are dispersive structures, have a group delay maximum at different frequencies which is purely dependent...
We present in this paper an information theoretic approach for analyzing the chromagram at its finest temporal resolution and for finding precise alignments of the similar segments in a song. We introduce information theoretic similarity measures for scoring the similarity of the candidate repetitions and for providing a final interpretation of the overall structure. Finally, we present experimental...
This paper concentrates on the problem of minimizing network coding resources with end-to-end delay and delay variation constraints in multimedia network. Network coding resources optimization problem has proved to be NP-hard, and the introduction of delay constraints makes it more complicated to be solved, since essentially the single problem of constructing such delay constrained tree without combining...
This paper tackles the problem of providing end to end reliable transmissions in a randomly deployed wireless sensor network. To this aim, we investigate the simultaneous use of gradient broadcast routing (for its inherent adaptability to any network topology and its changes), fountain codes (for their universal property) and intra-flow network coding (to introduce packet diversity in redundant copies)...
Three stakeholders come into play in peer-to-peer (P2P) video-on-demand (VoD), namely peers/viewers, content providers and ISPs. Different design choices have been proposed to improve quality of user experience, to bring down content server bandwidth cost and to reduce ISP-unfriendly traffic. However, it is unclear whether the ability of these design choices to meet interests of one stakeholder comes...
This paper presents the results of compression comparison tests between the current state of the emerging High Efficiency Video Coding (HEVC) draft standard and the current dominant standard H.264/MPEG-4 AVC (High Profile) as an anchor reference. The conditions used for the comparison tests were designed to reflect relevant application scenarios and to enable a fair comparison to the maximum extent...
In deep sub-micron processes, on-chip interconnect is becoming the delay bottleneck and predominant source of power consumption. Simultaneous switching of large buses pose a great challenge on peak current as well. In this paper, we present a novel bus coding technique, based on transition pattern codes (TPC), to perform joint optimization. A TPC scheme has been constructed employing a joint cost...
A Mobile Ad Hoc Network (MANET) is a dynamic wireless network that can be formed without the need for any pre-existing infrastructure in which each node can act as a router. Due to bandwidth constraint and dynamic topology of mobile ad hoc networks, multipath supported routing is a very important research issue. This paper proposes a Network Coding-based on-demand Multipath Routing algorithm in MANET...
In this paper we study in-order packet delivery delay of two recently proposed network coded transmission schemes with applications in wireless broadcast. Unlike previous works where asymptotic behaviour of decoding or delivery delay was presented, we provide a general analysis of the three conditions under which in-order packet delivery is possible at a receiver: by 1) catching up with the sender,...
In this paper, we dynamically select the transmission rate and design wireless network coding to improve the quality of services such as delay for time critical applications. With low transmission rate, and hence longer transmission range, more packets may be encoded together, which increases the coding opportunity. However, low transmission rate may incur extra transmission delay, which is intolerable...
This paper investigates the impact of noise dependence and signal delay on the capacities of networks. It is shown that statistical dependence between the noise in a network's component channels is helpful for communication. In particular, the capacity region of a network whose component channels exhibit dependent noise is a superset of the capacity region of a network built from the same component...
For guaranteeing quasi-error free delivery of realtime multicast services over wireless networks, an efficient greedy algorithm is proposed for optimizing the parameters of a HARQ scheme with rateless codes under strict delay and bandwidth constraints. We take systematic Raptor codes as an example for analyzing the optimum performance of the HARQ scheme. The results show that the optimum performance...
We propose a new architecture for broadcasting an enormous amount of information over a large population of users in a typical urban area via multiple base stations for delay tolerant applications. The core idea is that each base station partially broadcasts the information instead of transmitting the whole information. In particular, the large target file is broken into M smaller chunks and is provided...
Decimal arithmetic has gained high impact on the overall performance of today's financial and commercial applications. Decimal additions and multiplication are the main decimal operations used in any decimal arithmetic algorithm. Decimal digit adders and decimal digit multipliers are usually the building blocks for higher order decimal adders and multipliers. FPGAs provide an efficient hardware platform...
An extended analog joint source-channel coding (JSCC) multiple description (MD) scheme is introduced. This new scheme extends a previously presented analog JSCC-MD scheme in order to work at different bandwidth ratios. This scheme is suitable for transmissions through parallel AWGN on-off channels and parallel slow-fading channels. The strengths of the proposed scheme in comparison with other coding...
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