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Ultra-deep sub-micron technology is shifting the design paradigm from area optimization to power optimization. In the context of Network-on-Chip (NoC) based design, energy consumption due to data transfer among network nodes is no longer negligible. Starting from the observation that, among the two brain hemispheres around 1 out of 106 synapses are active at the same time, in this paper we propose...
We investigate the overlay coding scheme as the capacity achieving multi user detection (MUD) technique, i.e., transmitting over non-orthogonal channels, in forward link in multi-beam satellite systems with dense frequency reuse. The classic overlay coding scheme, uses the strongest co- channel interference (CCI) as extra source of information. The data intended for the target user is shared between...
Due to asynchronous packet transmissions and rate mismatch among different coding flows in existing opportunistic network coding architectures, such as COPE, the amount of packets which can be coded together may be insufficient and thus the performance gain of network coding cannot be fully exploited. One feasible solution for this problem is to make coding nodepurposely delay some packet transmissions...
In this work, we propose and optimize a new coding strategy designed to enhance the throughput of hybrid ARQ (HARQ) transmissions over i.i.d. block-fading channels where the channel state information (CSI) is unknown at the transmitter. Unlike in the conventional approach, where many blocks are exclusively assigned to carry the HARQ rounds of a single packet, we use a joint coding and the same channel...
Erasure coding, Reed-Solomon coding in particular, is a key technique to deal with failures in scale-out storage systems. However, due to the algorithmic complexity, the performance overhead of erasure coding can become a significant bottleneck in storage systems attempting to meet service level agreements (SLAs). Previous work has mainly leveraged SIMD (single-instruction multiple-data) instruction...
This paper comprehensively studies the secure decode-and-forward (DF) relaying transmission in slow fading channels. To maximize the secrecy throughput under a secrecy outage probability constraint, we propose three adaptive transmission schemes (ATSs) with different complexity and flexibility, and design system parameters according to the instantaneous channel state information of the legitimate...
Multiprocessor systems are becoming ubiquitous in today's embedded systems design. In this paper, we address the problem of mapping an application represented by a Homogeneous Synchronous Dataflow (HSDF) graph onto a real-time multiprocessor platform with the objective of maximizing total throughput. We propose that the optimal solution to the problem is composed of three components: actor-to-processor...
Network coding is a new communication paradigm which allows network nodes not only to forward packets but also to combine them together to reduce the number of transmissions. COPE has been the first network coding scheme designed for unicast traffic in wireless networks. COPE-based network coding-aware routing optimization has been proposed to improve network performances. However, it is interesting...
We propose a rate-adaptive error-correction coding framework for transmission over finite-length block-fading channels, with causal channel state information at the transmitter. A dynamic programming optimization approach can be use to obtain the optimal rate adaptation strategy. A suboptimal rate adaptation strategy is developed for sequential random codes. Numerical results show that significant...
In this work we consider incremental redundancy hybrid ARQ (HARQ) transmission of data packets over independent block-fading channels. In HARQ, the transmitter, upon request (NACK), resends the "NACKed" packet in the next available block. Conventionally, the original and retransmitted packets occupy one block, each. In our approach, we allow the transmitter to share the resources between...
A fundamental challenge in wireless networks is handling packet loss due to dynamic noise, interference, and dynamic channel effects, especially when there is no per-packet acknowledgement due to additional delays and potential loss of feedback packets. We design and implement a packet coding optimization scheme applied at source node to enhance end-to end transmission reliability in a lossy multi-hop...
Network coded opportunistic routing (NCOR) is a potential communication paradigm in wireless multi-hop networks (WMN) with lossy links. It leverages the multipath diversity of wireless networks and applies network coding to resist random erasures. Related optimization work minimizing transmission cost or maximizing throughput are based on the collision-free assumption, which either requires perfect...
We propose a three-message superposition coding scheme in a cognitive radio relay network exploiting active cooperation between primary and secondary networks. The time resource is split into three transmission phases. The first two phases are dedicated to primary communication, while the third phase is for the secondary's transmission. We formulate a throughput maximization problem for the secondary...
Network coding is an efficient technique to improve the throughput of wireless network. It is observed that there exists short period unfairness when nodes are competing for the wireless channels, which will decrease the opportunity of inter-session network coding in WMN(Wireless Mesh Network). A coding-aware cross-layer optimization mechanism is proposed in this paper. In the proposed mechanism,...
Existing network coding architectures such as COPE in wireless networks depend on opportunistic listening to improve network throughput. Data cache management for the purpose of decoding to enhance the performance gain of network coding has not been deeply investigated. In this paper, we present a general model to address this problem, aiming at improving decoding efficiency of network coding and...
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...
We consider the problem of introducing network coding in a network in a manner that balances the benefits obtained from coding with the costs of providing coding, where such costs depend both on the number of nodes performing coding and the volume of traffic that is coded. Previous work has envisaged either the minimization of the number of nodes performing coding, which is a NP-hard problem, or the...
Network coding is a new data transmission method which is different from the traditional storage and forwarding routing technology. By using network coding, it can improve the throughput of the media multicast network. This paper study the layer rate allocation optimization problem based on network coding for media multicast network. By optimal allocating layer rate, the total rate of all receiving...
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...
When attempting to deliver contents over wireless networks in an efficient manner, the different protocols involved must deal with several sources of loss such as congestion and channel errors, which can prevent an effective message reception at the destination. Therefore, content delivery protocols must deal with these problems in the most appropriate way. In this paper we focus on the design, implementation,...
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