The streaming of real-time audio/video data is very challenging because of the time-varying and unreliable wireless channels, video content characteristics, limited bandwidth, dynamic topology, heterogeneous and distr...
详细信息
ISBN:
(纸本)9781467317191;9781467317207
The streaming of real-time audio/video data is very challenging because of the time-varying and unreliable wireless channels, video content characteristics, limited bandwidth, dynamic topology, heterogeneous and distributed environment and high packet loss rate because of wireless interference and channel fading. Because of such open issues present in wireless networks, it is very difficult to satisfy the requirements of audio/video streaming applications such as low delay, low packet loss, jitter control etc. In such scenarios of opportunistic networks where real time data is being streamed from server node to client node, network coding and its variants can be used by such nodes to meet different requirements. network coding changes the role of such multimedia nodes from store and forward to encode data packets. Encoding process includes mathematical operations on data packets. This survey paper has considered number of speculative and practical approaches and cases where network coding or its variant applied either fully or partially on multimedia traffic with the aim to improve performance and to provide protection against packet losses. This review has mainly focused on the opportunity of performance enhancement of MPEG-4 traffic over Wireless network using Random Linear network coding (RLNC) with Multi Generation Mixing (MGM). Using Multi Generation Mixing, packets of greater importance has got more protection, less loss, more reconstruction and recovery of real time data.
network coding is a technique that allows information flows to be encoded while routed across a data network. It was shown that network coding helps increase the throughput and reduce the cost of data transmission, es...
详细信息
ISBN:
(纸本)9781467307758
network coding is a technique that allows information flows to be encoded while routed across a data network. It was shown that network coding helps increase the throughput and reduce the cost of data transmission, especially for one-to-many multicast applications. An important direction in network coding research is to understand and quantify the coding advantage and cost advantage, i.e., the potential benefits of network coding, as compared to routing, in terms of increasing throughput and reducing transmission cost, respectively. Two classic network models were considered in previous studies of coding advantage: directed networks and undirected networks. The study of coding advantage in this work further focuses on two types of parameterized networks, including bidirected networks and hyper-networks, which generalizes the directed and the undirected network models, respectively. With proper parameter setting, more realistic modeling of networks in practice can be achieved. We prove upper-bounds and lower-bounds on the coding advantage for multicast in these models. Some of our bounds are new and unknown before, some improve upon previously proven bounds, and some answer open questions in the literature.
As a substantial means for improving throughtput, network coding has recently attracted much attention to apply in wireless multicast services. To guarantee the reliable multicast, packet retransmission schemes are em...
详细信息
ISBN:
(纸本)9781467309905;9781467309882
As a substantial means for improving throughtput, network coding has recently attracted much attention to apply in wireless multicast services. To guarantee the reliable multicast, packet retransmission schemes are employed. With one source, network coding has been well studied for the reliable multicast. But for the multicast cell with two sources, the presented schemes are not good enough to approach an impressive effect with the multiple receivers, demands and link situations. In this paper, for the 2-1-(D-1,D-2) multicast cell, which has two sources, one relay and two groups users with the receivers numbers of D-1 and D-2, we propose three schemes to reduce the number of retransmission, which combine the lost packets and retransmit them with network coding, and obtains the least number of retransmissions. Some theoretical results are derived on the bandwidth efficiency of the traditional automatic repeat-request scheme (ARQ), network coding with ARQ scheme (XOR-ARQ) and the improved network coding with ARQ scheme (iXOR-ARQ). Compared with ARQ and XOR-ARQ, iXOR-ARQ is more advantageous on the bandwidth efficiency and the coding gain, which has been confirmed by both simulations and theoretical analysis.
network coding (NC) can achieve the maximum information flow in the network by allowing nodes to combine received packets before retransmission. Several papers have shown NC to be beneficial in mobile ad-hoc networks,...
详细信息
ISBN:
(纸本)9781467300469
network coding (NC) can achieve the maximum information flow in the network by allowing nodes to combine received packets before retransmission. Several papers have shown NC to be beneficial in mobile ad-hoc networks, but the delay introduced by buffered decoding raises a problem in real-time streaming applications. Here we propose to use NC jointly with multiple description coding (MDC) to allow instant decoding of the received packets. The optimal encoding coefficients are chosen via distributed optimisation of the expected video quality. Nodes receive up-to-date information about the network topology through a recently proposed protocol, originally designed for real-time streaming of MDC video. Results show that, due to the limitations imposed by instant decoding to the coding window size, our approach consistently outperforms the popular technique of random linear network coding.
In this paper, we propose a coding strategy that maximizes the density of the coding opportunities in instantly decodable network coding (IDNC). Using the graph representation of IDNC, we derive the expression for the...
详细信息
ISBN:
(纸本)9781467325790
In this paper, we propose a coding strategy that maximizes the density of the coding opportunities in instantly decodable network coding (IDNC). Using the graph representation of IDNC, we derive the expression for the expected evolutions of coding opportunities after the transmission of any arbitrary coded packet and show that serving the maximum number of receivers, with the largest numbers of missing packets and erasure probabilities, tends to both maximize the expected number of coding opportunities and increase the expected coding density almost monotonically. Simulation results justify our theoretical findings and demonstrate the importance of maintaining high coding density when optimizing long-term parameters.
In this paper, we investigate the benefit of Joint network Channel coding (JNCC) for a new class of Multiple Access Relay Channel (MARC), defined as follows: (1) Independent sources communicate with a single destinati...
详细信息
ISBN:
(纸本)9781467325691
In this paper, we investigate the benefit of Joint network Channel coding (JNCC) for a new class of Multiple Access Relay Channel (MARC), defined as follows: (1) Independent sources communicate with a single destination in the presence of a relay;(2) The relay is half-duplex and applies a Selective Decode and Forward (SDF) strategy, i.e, it forwards only a deterministic function of the error-free decoded messages;(3) The sources are allowed to transmit simultaneously during both the listening phase and the transmission phase of the relay. We refer this model to as Non-Orthogonal MARC (NOMARC), which better leverages the broadcast nature of the radio channel than its more conservative orthogonal counterpart, i.e., Orthogonal MARC (OMARC). This paper aims at measuring the advantage brought by NOMARC/JNCC over OMARC/JNCC from both an information-theoretic and a practical code design perspectives.
Recently, wireless communication methods that exploit the broadcast nature of the wireless medium have been attracting growing attention. Among these methods, opportunistic routing and network coding are regarded as t...
详细信息
ISBN:
(纸本)9781467304375;9781467304368
Recently, wireless communication methods that exploit the broadcast nature of the wireless medium have been attracting growing attention. Among these methods, opportunistic routing and network coding are regarded as the most promising techniques. While there have been some attempts to combine opportunistic routing with network coding to capture the advantages of both techniques, none of these attempts has considered bit-rate selection for data transmission in multi-rate wireless networks. In this paper, we study the potential benefits of the combination of opportunistic routing and network coding with the bit-rate selection mechanism from an optimization perspective. We develop a theoretical model and algorithm for finding the optimal forwarding scheme for a multi-rate combination of opportunistic routing and network coding in a given network. MIT Roofnet trace-based simulations show that considering bit-rate selection in combination with opportunistic routing and network coding has substantial benefits in terms of the expected transmission time compared to multi-rate opportunistic routing, multi-rate network coding, and a fixed-rate combination approach.
作者：
Hou, HanxuLi, HuiPeking Univ
Shenzhen Key Lab Cloud Comp Technol & Applicat Shenzhen Grad Sch Shenzhen Eng Lab Converged Network Tech Shenzhen 518055 Peoples R China
The capacity region of the single-source multicast network coding has an explicit Max-flow Min-cut representation. But for multi-source multicast networks the problem is still open. In this paper, we mainly discuss th...
详细信息
ISBN:
(纸本)9781467321013;9781467321006
The capacity region of the single-source multicast network coding has an explicit Max-flow Min-cut representation. But for multi-source multicast networks the problem is still open. In this paper, we mainly discuss the case of independent encoding multi-source multicast network using inter-session network coding. We propose a multi-source independent encoding theorem for this problem which characterizes the admissible coding rate region of independent encoding for relevant multiple sources. The theorem is proposed by the paper according to the strongly typical sequences and random coding. We also point out the connections between our theorem and the general multi-source network coding problem, of which the results are computable and can be used to design the multi-source network coding algorithm.
Wireless sensor network (WSN) is a emerging, highly integrated field which involves several subjects and colligate knowledge at present. It contains a large number,even thousands of nodes concentrating with the monito...
详细信息
ISBN:
(纸本)9783037853191
Wireless sensor network (WSN) is a emerging, highly integrated field which involves several subjects and colligate knowledge at present. It contains a large number,even thousands of nodes concentrating with the monitor that controls wireless communications network systems. The nodes extensively distributed have facility of breaking down because of the diversified environment and exhausting of energy For the limit of energy and communication capacity, this paper comes up with a new kind of technique that we import the multi-path transmission combined with network coding into WSN to balance network load, reduce energy consumption integrally and extend network life cycle.
Adaptive traffic ratio control (ATRC) with hybrid network coding and cooperative relaying is proposed to improve the overall throughput in an asymmetric data traffic network. The scheme is used in conjunction with ada...
详细信息
ISBN:
(纸本)9781467318792
Adaptive traffic ratio control (ATRC) with hybrid network coding and cooperative relaying is proposed to improve the overall throughput in an asymmetric data traffic network. The scheme is used in conjunction with adaptive transmission protocol and relay selection based on instantaneous channel state information. Simulation results show that (i) ATRC provides better trade-off between achieved throughput and traffic ratio and (ii) both maximum throughput and guaranteed traffic ratio can be simultaneously achieved by ATRC as offered traffic approaches symmetric.
暂无评论