How to Implement Optical Visual MIMO in NS2

To implement Optical Visual MIMO (Multiple-Input Multiple-Output) in NS2 has needs to include mimicking a communication system in which multiple optical transceivers (transmitters and receivers) are utilized to upsurge the data transmission capacity and reliability. MIMO systems use multiple antennas at both the transmitter and receiver ends, and in the instance of Optical MIMO, it contains multiple optical transmitters and receivers. This system is used to improve the performance in optical wireless communication, like free-space optics (FSO).

Though NS2 doesn’t natively support Optical Visual MIMO can mimic its characteristics by generating a network with multiple parallel communication links among the nodes to denote the multiple optical channels of a MIMO system.

Here is an approach on how to implement the optical visual MIMO in ns2:

Steps to Implement Optical Visual MIMO in NS2:

  1. Set up the Simulation Environment

Initially, describe the nodes that denote optical transmitters and receivers. We will introduce multiple optical communication links among the nodes to mimic MIMO communication, in which each link denotes a different optical path.

Example TCL Script for Basic Setup:

# Create a simulator instance

set ns [new Simulator]

# Define optical link parameters for each MIMO channel

set bw_optical 10Gb          ;# Bandwidth for each optical MIMO channel

set delay_optical 2ms        ;# Delay for each optical link (can represent distance)

# Create nodes representing optical transceivers (transmitters and receivers)

set tx1 [$ns node]           ;# Transmitter 1

set tx2 [$ns node]           ;# Transmitter 2

set rx1 [$ns node]           ;# Receiver 1

set rx2 [$ns node]           ;# Receiver 2

# Create optical MIMO links between the transmitters and receivers

$ns duplex-link $tx1 $rx1 $bw_optical $delay_optical DropTail  ;# MIMO Channel 1

$ns duplex-link $tx1 $rx2 $bw_optical $delay_optical DropTail  ;# MIMO Channel 2

$ns duplex-link $tx2 $rx1 $bw_optical $delay_optical DropTail  ;# MIMO Channel 3

$ns duplex-link $tx2 $rx2 $bw_optical $delay_optical DropTail  ;# MIMO Channel 4

In this setup, tx1 and tx2 denotes the transmitters, though rx1 and rx2 denotes the receivers. Multiple duplex links mimic the parallel optical channels, in which each link corresponds to a different path in the MIMO system.

  1. Configure Traffic for MIMO Communication

Next, configure traffic for each optical path in the MIMO system. This can be completed using UDP or TCP agents to mimic the data flows on each channel.

Example of Configuring Traffic on MIMO Channels:

# Create a UDP agent for Transmitter 1 (tx1) to Receiver 1 (rx1)

set udp_tx1_rx1 [new Agent/UDP]

$ns attach-agent $tx1 $udp_tx1_rx1

# Create CBR traffic generator for Channel 1

set cbr_tx1_rx1 [new Application/Traffic/CBR]

$cbr_tx1_rx1 set packet_size_ 1000        ;# Packet size in bytes

$cbr_tx1_rx1 set rate_ 1Gb                ;# Data rate for Channel 1

$cbr_tx1_rx1 attach-agent $udp_tx1_rx1

# Create a UDP sink at Receiver 1 (rx1)

set null_rx1 [new Agent/Null]

$ns attach-agent $rx1 $null_rx1

# Connect tx1 to rx1 on Channel 1

$ns connect $udp_tx1_rx1 $null_rx1

# Similarly, set up traffic for other MIMO channels

# Channel 2: tx1 to rx2

set udp_tx1_rx2 [new Agent/UDP]

$ns attach-agent $tx1 $udp_tx1_rx2

set cbr_tx1_rx2 [new Application/Traffic/CBR]

$cbr_tx1_rx2 set packet_size_ 1000

$cbr_tx1_rx2 set rate_ 1Gb

$cbr_tx1_rx2 attach-agent $udp_tx1_rx2

set null_rx2 [new Agent/Null]

$ns attach-agent $rx2 $null_rx2

$ns connect $udp_tx1_rx2 $null_rx2

# Channel 3: tx2 to rx1

set udp_tx2_rx1 [new Agent/UDP]

$ns attach-agent $tx2 $udp_tx2_rx1

set cbr_tx2_rx1 [new Application/Traffic/CBR]

$cbr_tx2_rx1 set packet_size_ 1000

$cbr_tx2_rx1 set rate_ 1Gb

$cbr_tx2_rx1 attach-agent $udp_tx2_rx1

$ns connect $udp_tx2_rx1 $null_rx1

# Channel 4: tx2 to rx2

set udp_tx2_rx2 [new Agent/UDP]

$ns attach-agent $tx2 $udp_tx2_rx2

set cbr_tx2_rx2 [new Application/Traffic/CBR]

$cbr_tx2_rx2 set packet_size_ 1000

$cbr_tx2_rx2 set rate_ 1Gb

$cbr_tx2_rx2 attach-agent $udp_tx2_rx2

$ns connect $udp_tx2_rx2 $null_rx2

# Start and stop the traffic on all MIMO channels

$ns at 1.0 “$cbr_tx1_rx1 start”

$ns at 1.0 “$cbr_tx1_rx2 start”

$ns at 1.0 “$cbr_tx2_rx1 start”

$ns at 1.0 “$cbr_tx2_rx2 start”

$ns at 10.0 “$cbr_tx1_rx1 stop”

$ns at 10.0 “$cbr_tx1_rx2 stop”

$ns at 10.0 “$cbr_tx2_rx1 stop”

$ns at 10.0 “$cbr_tx2_rx2 stop”

In this configuration, each channel in the MIMO system carries independent traffic, that mimics parallel data streams across multiple optical paths.

  1. Enable Tracing and Monitor MIMO Communication

NS2 delivers tracing capabilities that enable to observe packet transmission and reception via the multiple optical channels in the MIMO system. We can permit tracing to capture packet details, like transmission time, packet loss, and throughput.

Enable Trace Files:

# Enable tracing for the simulation

set tracefile [open “optical_mimo_trace.tr” w]

$ns trace-all $tracefile

# Define a finish procedure to end the simulation and close the trace file

proc finish {} {

global ns tracefile

$ns flush-trace

close $tracefile

exit 0

}

# Set the simulation end time

$ns at 20.0 “finish”

The trace file will capture events like packet transmissions, latency, and any drops, delivering insights into how the MIMO system performs via the optical channels.

  1. Run the Simulation

Execute the simulation to monitor on how data is routed over the multiple optical channels that mimics the behaviour of an Optical Visual MIMO system.

# Run the simulation

$ns run

Example Complete TCL Script for Optical Visual MIMO Simulation

# Create a simulator instance

set ns [new Simulator]

# Define optical link parameters for each MIMO channel

set bw_optical 10Gb

set delay_optical 2ms

# Create nodes representing optical transceivers (transmitters and receivers)

set tx1 [$ns node]           ;# Transmitter 1

set tx2 [$ns node]           ;# Transmitter 2

set rx1 [$ns node]           ;# Receiver 1

set rx2 [$ns node]           ;# Receiver 2

# Create optical MIMO links between the transmitters and receivers

$ns duplex-link $tx1 $rx1 $bw_optical $delay_optical DropTail  ;# MIMO Channel 1

$ns duplex-link $tx1 $rx2 $bw_optical $delay_optical DropTail  ;# MIMO Channel 2

$ns duplex-link $tx2 $rx1 $bw_optical $delay_optical DropTail  ;# MIMO Channel 3

$ns duplex-link $tx2 $rx2 $bw_optical $delay_optical DropTail  ;# MIMO Channel 4

# Create UDP agent for traffic on Channel 1 between tx1 and rx1

set udp_tx1_rx1 [new Agent/UDP]

$ns attach-agent $tx1 $udp_tx1_rx1

set cbr_tx1_rx1 [new Application/Traffic/CBR]

$cbr_tx1_rx1 set packet_size_ 1000

$cbr_tx1_rx1 set rate_ 1Gb

$cbr_tx1_rx1 attach-agent $udp_tx1_rx1

set null_rx1 [new Agent/Null]

$ns attach-agent $rx1 $null_rx1

$ns connect $udp_tx1_rx1 $null_rx1

# Channel 2: tx1 to rx2

set udp_tx1_rx2 [new Agent/UDP]

$ns attach-agent $tx1 $udp_tx1_rx2

set cbr_tx1_rx2 [new Application/Traffic/CBR]

$cbr_tx1_rx2 set packet_size_ 1000

$cbr_tx1_rx2 set rate_ 1Gb

$cbr_tx1_rx2 attach-agent $udp_tx1_rx2

set null_rx2 [new Agent/Null]

$ns attach-agent $rx2 $null_rx2

$ns connect $udp_tx1_rx2 $null_rx2

# Channel 3: tx2 to rx1

set udp_tx2_rx1 [new Agent/UDP]

$ns attach-agent $tx2 $udp_tx2_rx1

set cbr_tx2_rx1 [new Application/Traffic/CBR]

$cbr_tx2_rx1 set packet_size_ 1000

$cbr_tx2_rx1 set rate_ 1Gb

$cbr_tx2_rx1 attach-agent $udp_tx2_rx1

$ns connect $udp_tx2_rx1 $null_rx1

# Channel 4: tx2 to rx2

set udp_tx2_rx2 [new Agent/UDP]

$ns attach-agent $tx2 $udp_tx2_rx2

set cbr_tx2_rx2 [new Application/Traffic/CBR]

$cbr_tx2_rx2 set packet_size_ 1000

$cbr_tx2_rx2 set rate_ 1Gb

$cbr_tx2_rx2 attach-agent $udp_tx2_rx2

$ns connect $udp_tx2_rx2 $null_rx2

# Start and stop the traffic on all MIMO channels

$ns at 1.0 “$cbr_tx1_rx1 start”

$ns at 1.0 “$cbr_tx1_rx2 start”

$ns at 1.0 “$cbr_tx2_rx1 start”

$ns at 1.0 “$cbr_tx2_rx2 start”

$ns at 10.0 “$cbr_tx1_rx1 stop”

$ns at 10.0 “$cbr_tx1_rx2 stop”

$ns at 10.0 “$cbr_tx2_rx1 stop”

$ns at 10.0 “$cbr_tx2_rx2 stop”

# Enable tracing

set tracefile [open “optical_mimo_trace.tr” w]

$ns trace-all $tracefile

# End simulation

$ns at 20.0 “finish”

proc finish {} {

global ns tracefile

$ns flush-trace

close $tracefile

exit 0

}

# Run the simulation

$ns run

We had entirely got an advanced knowledge about how to setup, configure and enable the optical visual MIMO scenario in the tool of ns2 that effectively used to optimize the performance. We plan to deliver more information regarding this process in further manuals.

ns2project.com team of experts is ready to assist you in finding the best thesis ideas and topics that suit your interests. If you want excellent results in Optical Visual MIMO, don’t hesitate to contact the ns2project.com team. We also provide support for various optical transmitters and receivers tailored for optical networks.