مقاله شبکه های بی سیم Simulated Annealing based Wireless Sensor Network Localization with Flip Ambiguity Mitigation

اختصاصی از رزفایل مقاله شبکه های بی سیم Simulated Annealing based Wireless Sensor Network Localization with Flip Ambiguity Mitigation دانلود با لینک مستقیم و پر سرعت .

مقاله شبکه های بی سیم Simulated Annealing based Wireless Sensor Network Localization with Flip Ambiguity Mitigation

دانلود مقاله Block-level packet recovery with network coding for wireless reliable multicast

اختصاصی از رزفایل دانلود مقاله Block-level packet recovery with network coding for wireless reliable multicast دانلود با لینک مستقیم و پر سرعت .

Title: Block-level packet recovery with network coding for wireless reliable multicast

Author(S) : Kaikai Chi,Xiaohong Jiang, Yi-hua Zhu, Jing Wang, Yanjun Li

Journal/Conference Name: Computer Networks

Volume: 57

Year: 2013

Issue: 4

Pages: 910-923

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دانلود مقاله An Efficient Forward Error Correction Scheme for Wireless Sensor Network

اختصاصی از رزفایل دانلود مقاله An Efficient Forward Error Correction Scheme for Wireless Sensor Network دانلود با لینک مستقیم و پر سرعت .

Title: An Efficient Forward Error Correction Scheme for Wireless Sensor Network

Author(S) :M.P.Singha, Prabhat Kumarb

Journal/Conference Name: OpticalSwitchingandNetworking

 :Volume

Year: 2012

:Issue

Pages: 737 – 742

Abstract
The two basic methods to recover erroneous packets in any network are Automatic Repeat Request (ARQ), and
Forward Error Correction (FEC). The life time of any wireless sensor network depends directly on the efficient use of
its power resources. Power is primarily consumed during wireless transmission and reception. As energy conservation
is a major issue of concern in WSN, repeat transmission is not an option and FEC would be preferred over ARQ. One
such FEC scheme is (16, 8) quasi cyclic code, which can be used to correct up to 2 Bit Errors and to detect 3 Bit
Errors. However, when more than 2 errors occur, retransmission of data is required. In this work, an efficient FEC
scheme for WSN’s has been developed to avoid retransmission which not only saves energy but also extends its
functionality and enables it to handle “BURST ERRORS”. The Proposed Error Correction Scheme is effective for
correcting Burst Errors of even 8 bits.

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دانلود مقاله PPR: Partial Packet Recovery for Wireless Networks

اختصاصی از رزفایل دانلود مقاله PPR: Partial Packet Recovery for Wireless Networks دانلود با لینک مستقیم و پر سرعت .

PPR: Partial Packet Recovery for Wireless Networks
Kyle Jamieson and Hari Balakrishnan
MIT Computer Science and Artificial Intelligence Lab
{jamieson, hari}@csail.mit.edu

Abstract
Bit errors occur over wireless channels when the signal isn’t strong enough to
overcome the effects of interference and noise. Current wireless protocols may use
forward error correction (FEC) to correct for some (small) number of bit errors,
but generally retransmit the whole packet if the FEC is insufficient. We observe
that current wireless mesh network protocols retransmit a number of packets and
that most of these retransmissions end up sending bits that have already been received
multiple times, wasting network capacity. To overcome this inefficiency, we
develop, implement, and evaluate a partial packet recovery (PPR) system.
PPR incorporates three new ideas: (1) SoftPHY, an expanded physical layer
(PHY) interface to provide hints to the higher layers about how “close” the actual
received symbol was to the one decoded, (2) a postamble scheme to recover data
even when a packet’s preamble is corrupted and not decodable at the receiver,
and (3) PP-ARQ, an asynchronous link-layer retransmission protocol that allows a
receiver to compactly encode and request for retransmission only those portions of
a packet that are likely in error.
Our experimental results from a 27-node 802.15.4 testbed that includes Telos
motes with 2.4 GHz Chipcon radios and GNU Radio nodes implementing the
Zigbee standard (802.15.4) show that PPR increases the frame delivery rate by a
factor of 2× under moderate load, and 7× under heavy load when many links have
marginal quality.

دانلود مقاله AN ANALYSIS OF VARIOUS PARAMETERS IN WIRELESS SENSOR NETWORKS USING ADAPTIVE FEC TECHNIQUE

اختصاصی از رزفایل دانلود مقاله AN ANALYSIS OF VARIOUS PARAMETERS IN WIRELESS SENSOR NETWORKS USING ADAPTIVE FEC TECHNIQUE دانلود با لینک مستقیم و پر سرعت .

M.R.Ebenezar jebarani1and T.Jayanthy2

ABSTRACT
In Wireless sensor network, since the media is wireless there will be burst errors which leads to
high bit error rate that affect the throughput. Wireless sensor networks drop the packets due to propagation
errors that lead to retransmission traffic. This paper evaluates the effect of adaptive FEC in Wireless
sensor networks. Adaptive FEC technique improves the throughput by dynamically tuning FEC depending
upon the wireless channel loss. The main aim is to achieve desire throughput with less energy
consumption. If the retransmission traffic decreases, that is error correction performed using adaptive FEC
which maximize the throughput. The other related parameters packet delivery ratio, packet loss, delay,
error rate are also being analyzed. The algorithm reduces the retransmission traffic by using Adaptive
FEC technique thus improving the throughput and reduces the error rate.
KEYWORDS:
Throughput, adaptive FEC, wireless channel, Bit error rate, ARQ
1. INTRODUCTION