Domain
NETWORKING

Technology
DOT NET

Abstract:
A DISTRIBUTED CSMA ALGORITHM FOR THROUGHPUT AND UTILITY MAXIMIZATION IN WIRELESS NETWORKS

In multihop wireless networks, designing distributed scheduling algorithms to achieve the maximal throughput is a challenging problem because of the complex interference constraints among different links. Traditional maximal-weight scheduling (MWS), although throughput-optimal, is difficult to implement in distributed networks. On the other hand, a distributed greedy protocol similar to IEE ....etc

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Introduction
Wireless mesh networks (WMN) have become increasingly popular in the last couple
of years due to advantages like low setup cost, easy network maintenance, robustness
and reliable service coverage and technology-independence . In WMNs, each node
acts both as a host and a router, forwarding packets on behalf of other nodes, provided
that the nodes are in range of one another. This property can be exploited to extend
wireless connectivity in hard-to-reach locations .
1.1 Motivation
Outdo ....etc

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ttanks alott but where are the code.??????????????????????????????????????????? ....etc

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Performance Analysis of CSMA/CA protocol in IEE 802.11 Networks using Backoff mechanism

Abstract: The distributed coordination function (DCF) in the IEE 802.11 standard for wireless LAN is based on the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) like medium access control protocol. This collision avoidance is implemented by means of backoff procedure which uses a rotating window mechanism. This paper presents a simulation analysis of the slot selection probabilities and the backoff mechanism. The obt ....etc

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Error while running this code

function X = tdma(A,B,C,D)
%TriDiagonal Matrix Algorithm (TDMA) or Thomas Algorithm
% A_i*X_(i-1) + B_i*X_i + C_i*X_(i+1) = D_i (where A_1 = 0, C_n = 0)
% A,B,C,D are input vectors. X is the solution, also a vector.

% Copyright 2013 The MathWorks, Inc.

Cp = C;
Dp = D;
n = length(A);
X = zeros(n,1);
% Performs Gaussian elimination
Cp(1) = C(1)/B(1);
Dp(1) = D(1)/B(1);
for i = 2:n
Cp(i) = C(i)/(B(i)-Cp(i-1)*A(i));
Dp(i) = (D(i)-Dp(i-1)*A(i))/(B(i)-Cp(i-1)*A(i));
end
% Backward substitution, s ....etc

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Sir i need the matlab code..how can i download this file..here i saw that only background and how we imlpemented ....etc

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I need to simulate csma/cd using MATLAB.
[email protected] ....etc

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The Evolution of TDMA to 3G & 4G Wireless Systems

AT&T Wireless Services
TDMA
European GSM over 250 million
North American TDMA 50 million
Japanese PDC 50 million
CDMA
North American CDMA 60 million (including S. Korea)
TDMA parameters
30 KHz channels (like analog & CDPD)
20 msec speech frames
24.3 kbaud symbol rate
3 time-slots/users
7.4 kbps ACELP speech coding
1/2-rate channel coding on important bits interleaved over 2 bursts in 40 msec
Differential pi/4-QPSK modulation
EDGE Tech ....etc

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Abstract We implement a new software-based multihop TDMA MAC protocol (Soft-TDMAC) with microsecond synchronization using a novel system interface for development of 802.11 overlay TDMA MAC protocols (SySI-MAC). SySI-MAC provides a kernel independent message-based interface for scheduling transmissions and sending and receiving 802.11 packets. The key feature of SySI-MAC is that it provides near deterministic timers and transmission times, which allows for implementation of highly synchronized TDMA MAC protocols. Building on SySI-MAC's predict ....etc

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hi friends,
my name is chaganti niranjan reddy doing final year b.tech in swarna bharathi institute of science and technology. i am looking for matlab source code for 'image enhancement using adaptive tonal correction' as mini project. so please help me. if any one have its source code please mail me to this email id - [email protected] ....etc

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