使用csma/ca生成一个基于优先级的在不同节点数量下的能耗MATLAB代码
时间: 2023-12-03 13:47:01 浏览: 26
以下是一个基于优先级的CSMA/CA协议的能耗MATLAB代码。该代码使用了随机方式生成节点的数量和优先级,以便在不同的节点数量下进行测试。
```
% CSMA/CA with Priority Energy Consumption MATLAB Code
clear all;
close all;
clc;
% Simulation Parameters
numNodes = randi([5 20],1); % Randomly generate number of nodes
simTime = 100; % Simulation time (s)
Pmax = 10; % Maximum transmit power (dBm)
Pmin = -20; % Minimum transmit power (dBm)
packetSize = 100; % Packet size (bits)
dataRate = 10^6; % Data rate (bps)
cwMin = 15; % Minimum contention window size
cwMax = 1023; % Maximum contention window size
slotTime = 50*10^-6; % Slot time (s)
SIFS = 10*10^-6; % Short Inter-Frame Space (s)
DIFS = 2*SIFS + slotTime; % Distributed Inter-Frame Space (s)
ACKTime = SIFS + 10*10^-6; % ACK Time (s)
backoffLimit = 7; % Maximum number of retransmissions
priorityLevels = randi([1 4],1,numNodes); % Randomly generate priority levels
% Initialize Variables
t = 0;
backoff = zeros(1,numNodes);
backoffCount = zeros(1,numNodes);
collisionCount = zeros(1,numNodes);
successCount = zeros(1,numNodes);
energyConsumption = zeros(1,numNodes);
while t < simTime
% Reset variables for each time slot
channelState = 0; % 0 = idle, 1 = busy
packetQueue = zeros(1,numNodes); % 0 = empty, 1 = packet waiting to be sent
packetSent = zeros(1,numNodes); % 0 = no packet sent, 1 = packet sent
backoffCompleted = zeros(1,numNodes); % 0 = backoff not completed, 1 = backoff completed
collisionDetected = zeros(1,numNodes); % 0 = no collision detected, 1 = collision detected
% Generate packets based on priority levels
for i=1:numNodes
if randi([1 10],1) <= priorityLevels(i)
packetQueue(i) = 1;
end
end
% Perform CSMA/CA
while sum(packetQueue) > 0
% Check for channel idle
if channelState == 0
% Select node with highest priority to transmit
[priority, index] = max(priorityLevels.*packetQueue);
% Perform backoff if backoff not completed
if backoffCompleted(index) == 0
backoff(index) = randi([0 (2^backoffCount(index)-1)],1)*slotTime;
backoffCompleted(index) = 1;
end
% Check if backoff completed
if backoff(index) == 0
% Transmit packet
power = Pmax - 20*log10(backoffCount(index)+1);
if power < Pmin
power = Pmin;
end
energyConsumption(index) = energyConsumption(index) + power*packetSize/dataRate;
packetSent(index) = 1;
packetQueue(index) = 0;
channelState = 1;
end
% Channel busy
else
% Check for collision
if sum(packetSent) > 1
for i=1:numNodes
if packetSent(i) == 1
collisionCount(i) = collisionCount(i) + 1;
collisionDetected(i) = 1;
backoffCount(i) = min(backoffCount(i)+1,backoffLimit);
backoffCompleted(i) = 0;
end
end
channelState = 0;
end
end
% Update backoff timers
for i=1:numNodes
if backoffCompleted(i) == 1
backoff(i) = backoff(i) - slotTime;
if backoff(i) < 0
backoff(i) = 0;
end
end
end
% Wait for ACK Time
if sum(packetSent) == 1
for i=1:numNodes
if packetSent(i) == 1
energyConsumption(i) = energyConsumption(i) + ACKTime*packetSize/dataRate;
successCount(i) = successCount(i) + 1;
backoffCount(i) = max(backoffCount(i)-1,0);
backoffCompleted(i) = 0;
packetSent(i) = 0;
end
end
channelState = 0;
end
end
% Update time
t = t + DIFS + packetSize/dataRate + ACKTime;
end
% Calculate Energy Consumption
totalEnergy = sum(energyConsumption);
% Plot Results
figure;
subplot(3,1,1);
bar(priorityLevels);
xlabel('Node');
ylabel('Priority Level');
subplot(3,1,2);
bar(collisionCount);
xlabel('Node');
ylabel('Collision Count');
subplot(3,1,3);
bar(successCount);
xlabel('Node');
ylabel('Success Count');
% Display Results
disp(['Number of Nodes: ', num2str(numNodes)]);
disp(['Total Energy Consumption: ', num2str(totalEnergy), ' J']);
```
该代码生成了一个基于优先级的CSMA/CA协议的仿真,其中节点数量和优先级是随机生成的。该代码计算了每个节点的碰撞次数、成功传输次数和能耗,并生成了相应的图表。您可以运行该代码,并根据需要进行修改,以满足您的特定仿真需求。