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Trying to overcome the obstacles, such as low throughput and high SER or BER in traditional satellite systems, PNC was implied in the Satellite PNC System established in this paper with efficiency and reliability. The performances of AF-PNC, DF-PNC and DNF-PNC in the Satellite PNC System were investigated with simulations. With simulations results, an adaptive PNC strategy-Adaptive PNC was proposed...
In this paper we consider the Two Way Relay Channel (TWRC) where Noisy Network Coding (NNC) is performed. We propose an optimization scheme in terms of the sum rate by combining the Information Bottleneck (IB) method and the Bi-Section method. Then we compare the performance of the quantizer optimized by the proposed algorithm with other quantizers. We also compare and analyse the maximized sum rate...
This paper investigates the linear network coding map in a Physical-layer Network Coding (PNC) operated two-way relay network. To realize the full potential of Physical-layer Network Coding in high SNR regimes, we need to use high-order signaling beyond BPSK/QPSK. In a PNC system with high-order signaling, we can have many different choices for the network coding (NC) map. For linear network coding,...
We investigate the application of network coding to file transfers from a single source to multiple destinations in a two-hop ad hoc relay network that consists of half-duplex packet radios. Our network-coded file distribution techniques make simultaneous use of a pair of relay nodes. All transmissions by the source and the relay nodes employ packet-by-packet adaptive modulation and channel coding...
Physical-layer network coding (PNC) can significantly improve the throughput of wireless communication systems by exploiting signal superimposition at relays. It is practically challenging to achieve symbol alignment in PNC. In this paper, we study the impact of the signal power loss and the inter-symbol-interference (ISI) on the system performance when the symbols are not aligned. We show that when...
In this paper, we consider delay-constrained data transmission based on network coding techniques over error-prone IoT networks. While network coding approaches can provide various advantages, there is a critical drawback referred to as all-or-nothing problem; the encoded source data cannot be recovered if a set of required number of data is not entirely received by a decoding deadline. As a solution,...
We describe models based on a multilayer topology for wireless multi-hop networks employing linear physical layer network coding, and accounting for the scheduling of transmission in such networks. We discuss algebraic frameworks for the network code mappings, and requirements for unambiguous decoding at the destination. With reference to some simple examples we show that a framework based on binary...
This paper addresses the problem of reducing the delivery time of data messages to cellular users using instantly decodable network coding (IDNC) with physical-layer rate awareness. While most of the existing literature on IDNC does not consider any physical layer complications, this paper proposes a cross-layer scheme that incorporates the different channel rates of the various users in the decision...
This paper presents Powerline Physical-layer Network Coding (Powerline-PNC), a powerline communication architecture that employs physical-layer network coding (PNC). As the first work that applies PNC in powerline communication, we show that Powerline-PNC improves the throughput of bidirectional information interchange in the powerline network by 100% at the SNR cost of 3dB. Specifically, we design...
In this paper, we aim to identify best practices for optimizing random network coding implementations with respect to throughput. Experimental results show that via optimization the throughput of random network coding can be enhanced over 30x compared to a naïve implementation.
Network coding has the potential to improve the performance of current and future communication systems (including transportation and storage) and is currently even considered for communication architectures between the individual processors on same board or different boards in close proximity. Despite the fact that single core implementations show already comparable coding speeds with standard coding...
Buffer-aided network coding (NC) has been proposed as an effective method to improve retransmission efficiency. In this way, the correctly received undecodable NC combined retransmission packets are waited in the buffer for a future network decoding opportunity rather than delete. However, existing buffer-aided approaches fail to consider the buffer status and the latest feedback in the next round...
Applying network coding to a wireless cooperative communication network always proves beneficial, in terms of gains in spatial diversity, improved coverage and channel capacity. In this paper, a relay-selection method for a bidirectional (two-way) wireless cooperative communication system is proposed. A single best relay node or set of relay nodes are selected to jointly forward the combined data...
Although Random Linear Network Coding (RLNC) has been shown to reduce the number of transmissions for multi-cast scenarios, there is an inherent signaling overhead to achieve this benefit. Employing a large field result in less transmissions but at the cost of a large coding vector of coefficients. Conversely, a smaller field fewer bits to represent the coding coefficients, but has the drawback of...
Compute-and-forward is an emerging technique to increase throughput in interference networks. It allows the relays to decode an equation of codewords instead of each single codeword. Choosing the appropriate equation plays a crucial role on the performance. While there are several algorithms that solve this optimization problem, they all perform a local optimization. In large relay networks this can...
A new joint message-passing decoder is presented for use in a two-user cooperative wireless network. This decoder is designed for use with the diversity network coding scheme of Xiao et al. [1], which uses nonbinary network codes together with channel coding to achieve high diversity gains. The proposed joint decoder, together with appropriate modifications to the cooperative protocol of [1], significantly...
In this paper, we consider the network coding (NC) enabled three-phase protocol for information exchange between two users in a wireless two-way (bidirectional) relay network. Modulo-based (nonbinary) and XOR-based (binary) NC schemes are considered as information mixture schemes at the relay while all transmissions adopt pulse amplitude modulation (PAM). We first obtain the optimal constellation...
Band Codes (BC) have been recently proposed as a solution for controlled-complexity random Network Coding (NC) in mobile applications, where energy consumption is a major concern. In this paper, we investigate the potential of BC in a peer-to-peer video streaming scenario where malicious and honest nodes coexists. Malicious nodes launch the so called pollution attack by randomly modifying the content...
One of the promising architectures for the next generation of content distribution networks is the “cache network”, where each node has cache or local storage.We consider the index coding problem, where a central content server disseminates compressed multiple content data to each client that recovers the target content using the cached content, as side information. The coding scheme discussed in...
The rate regions of independent distributed source coding (IDSC) problems, a sub-class of the broader family of multi-source multi-sink networks, are investigated. An IDSC problem consists of multiple sources, multiple encoders, and multiple decoders, where each encoder has access to all sources, and each decoder has access to a certain subset of the encoders and demands a certain subset of the sources...
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