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Network coding (NC) has been shown to improve the throughput of multi-hop wireless networks (MWN). Prior work on performance modeling of NC mainly addresses the maximization of throughput. However, these works fail to capture the complete picture since there may be paths in the network for which end-to-end packet delay is prohibitively high. In this paper, we address the problem of delay minimization...
This paper studies feedback based instantly decodable network coding with the aim of minimizing decoding delay per transmission over wireless broadcast erasure channels with memory. We model such channels with a Gilbert-Elliott two-state Markov model with good and bad states. We first present a weighted sum generalized instantly decodable network coding (G-IDNC) scheme, where the aim is to service...
In this paper we validate and extend through simulations the trends revealed by the analytical results of our prior work concerning the throughput-delay trade-off that can be achieved by forwarding schemes exploiting path diversity and different degrees of redundancy focusing on the case of hop-by-hop retransmissions at the link-layer. The simulation environment is based on 802.11 Physical and Mac...
We propose a new transmission protocol for two-hop transmission employing rateless coding in the first hop and rateless-network coding in the second hop. In this protocol, communicating pairs (CP) and also relays are partitioned into small clusters; afterwards, each CP-cluster is assigned one relay cluster to improve data transmission. This scheme increases the diversity order (in comparison to the...
We present an analytical model for a random resource allocation and scheduling scheme for non-real-time polling service (nrtPS) traffic in IEEE 802.16e network. We adopt two system assumptions; unsaturation condition for the queue of each mobile station, and random amount of resources in a frame for each nrt-PS traffic, which are realistic for practical network systems. By jointly considering the...
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,...
Despite the fact that the Internet Protocol has not been designed to carry real-time media services at high data rate, such as digital TV in High Definition resolution, it is mean-while widely deployed as an alternative carrier infrastructure. Especially the IEEE 802.11 family of wireless LAN standards offers a convenient and inexpensive way to deliver media streams within the home network area. However,...
High-frequency (HF) radio communication has been recognized as the primary means for long-range wireless communications since the advent of radio. With its unique features, HF communication continues to be used for a wide range of civilian, government and military applications as a powerful alternative to a myriad of more sophisticated communication systems. However demanding requirements of high-speed...
Work reported herein contributes to the prediction of achievable performance of the IEEE 802.16 standard using time series of 50 Mchps PN channel sounder measurements at 4.9 GHz on radio channels in a scenario in which emergency vehicles are parked outside a building and operate as a centre for communications with rescue crews and equipment inside the building. Predicted error rates are presented...
Retransmission is the basic method to improve network reliability. Since the broadcasting character and unreliability of wireless links, we could apply the network coding to broadcast retransmission algorithm to improve the efficiency of retransmission. This article does a quantitative analysis for the performance of the wireless broadcast algorithm based on network coding from the delay perspective...
Telesurgical Robot Systems (TRSs) address mission critical operations emerging in extreme fields such as battlefields, underwater, and disaster territories. The lack of wirelined communication infrastructure in such fields makes the use of wireless technologies including satellite and ad-hoc networks inevitable. TRSs over wireless environments pose unique challenges such as preserving a certain reliability...
By theoretical analysis, we discuss the performance of random access protocol by network coding in wireless relay networks. We present a novel method to increase the opportunity of network coding in relay node. By using this method, the performance of random access protocol in wireless networks can be improved especially in low traffic load. We compare the performance of this method with network coding...
In this paper, we present a novel error resiliency approach for short-range point-to-point wireless video transmission systems that have particularly stringent delay constraints. We propose to utilize per-packet feedback information that can be generated and transmitted instantaneously from the receiver to the transmitter in such systems to help control the transmission errors. A framework for error...
With the presentation of more reliable groupcast proposal for IEEE802.11 WLAN, the QoS of video transmission based on groupcast (multicast / broadcast) is improved. To adapt the network load and bandwidth dynamic change in WLAN environment, we design a flexible optimization mechanism that integrates video steam priority character with more reliable groupcast technology. Simulation validates it is...
In this paper, we evaluate the possibility of monitoring-based network-adaptive forward error correction (FEC) for wireless multi-hop video streaming. By collectively monitoring the video streaming path with the help of intermediate nodes, the proposed hop-to-end (H2E) FEC scheme balances end-to-end and hop-by-hop FEC protection. It attempts to minimize the end-to-end packet loss and reduce overhead...
Advances in wireless access technologies like WiMax and LTE are driving the wireless video applications and wireless broadcasting video service in particular. Though existing erasure codes are designed to achieve high throughput for wireless broadcast/multicast, their potential for wireless video broadcasting can only be achieved if the distortions associated with video packets and their complex decoding...
In this paper, an approach minimizing delivery latency, while keeping transmitted power below a certain threshold, is proposed to provide reliable real time wireless communications when applying network coding principle in order to point out additional advantage in terms of capacity. An analytical tool is proposed to derive the performance of optimal power adaptation scheme NC scheme aiming at minimizing...
In this paper, we consider the problem of minimizing the mean completion delay in wireless broadcast for instantly decodable network coding. We first formulate the problem as a stochastic shortest path (SSP) problem. Although finding the packet selection policy using SSP is intractable, we use this formulation to draw the theoretical properties of efficient selection algorithms. Based on these properties,...
The 3GPP Long Term Evolution (LTE) systems have been designed to deliver higher peak data rates, higher capacity and lower air-interface latency compared to prior 2G and 3G systems. This high performance will make it possible to support more demanding applications beyond web browsing and voice, which will require higher data rates and QoS guarantees. Video services are becoming very popular over the...
Based on path diversity, Multi-Path Transmission (MPT) is an efficient method to improve delay and anti-error performance of streaming transmission in Wireless Mesh Network (WMN). This paper proposes a rate allocation algorithm among Multiple Descriptions (MD) based on Multiple Descriptions Coding (MDC) adopting H.264 technique, which presents the upper and the latter threshold for rate control to...
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