📡 Wireless Communication (230GETB38)

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About the Subject

Wireless Communication is the technology of transmitting information between two or more devices without using physical cables. Communication takes place through electromagnetic waves such as radio waves, microwaves and infrared waves.

Wireless communication is widely used in mobile phones, Wi-Fi, Bluetooth, satellite communication, GPS, IoT devices and modern 5G networks.

Course Objectives

Understand wireless communication fundamentals.
Study wireless transmission techniques.
Learn cellular communication concepts.
Understand GSM, LTE and 5G technologies.
Study wireless networking technologies.
Learn wireless security threats and applications.

Complete Syllabus

Unit I – Introduction to Wireless Communication

Evolution of Wireless Communication
Wireless vs Wired Communication
Applications of Wireless Communication
Recent Trends
Challenges
Basics of Antenna

Unit II – Wireless Transmission Basics

Frequency Spectrum
Radio Propagation
ASK
FSK
PSK
FDM
TDM
CDM
Noise
Interference
Fading

Unit III – Cellular Concepts

Cellular Architecture
Frequency Reuse
Handoff
Roaming
1G to 5G
Mobile Radio Standards

Unit IV – Mobile Communication Systems

GSM Architecture
BSS
BTS
BSC
MSC
HLR
VLR
AUC
EIR
GSM Protocols
GPRS
UMTS
LTE / 4G
5G Architecture

Unit V – Wireless Networks

IEEE 802.11 (Wi-Fi)
Wireless LAN MAC Protocols
Bluetooth
IEEE 802.15
WiMAX
Other WLAN Technologies

Unit VI – Threats & Applications

Eavesdropping
Sniffing
DoS Attack
Jamming
MAC Spoofing
IP Spoofing
Consumer Applications
Enterprise Applications
Healthcare Applications
Transport Applications
Military Applications

Blog Series

Introduction & Syllabus ✅
Unit I – Fundamentals of Wireless Communication
Unit II – Wireless Transmission Basics
Unit III – Cellular Concepts
Unit IV – GSM, LTE & 5G
Unit V – Wireless Networks
Unit VI – Threats & Applications
Final Revision & Important Questions

Expected Learning Outcomes

Understand wireless communication principles.
Explain modulation and multiplexing techniques.
Describe cellular communication architecture.
Understand GSM, LTE and 5G technologies.
Explain Wi-Fi, Bluetooth and WiMAX.
Identify wireless security threats.

📡 Unit I – Introduction to Wireless Communication

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1. Evolution of Wireless Communication

Wireless communication has evolved from simple radio communication to modern high-speed 5G networks. It allows communication without physical cables using electromagnetic waves.

Evolution Timeline

Generation	Technology	Main Feature
1G	Analog Mobile	Voice Calling
2G	GSM	Digital Voice & SMS
3G	UMTS	Internet & Video Calling
4G	LTE	High-Speed Mobile Internet
5G	NR	Ultra-Fast Speed & IoT

2. Wireless vs Wired Communication

Wireless Communication	Wired Communication
No physical cable required.	Uses physical cables.
Easy installation.	Installation is difficult.
Supports mobility.	Limited mobility.
More interference.	Less interference.
Lower installation cost.	Higher installation cost.

3. Applications of Wireless Communication

Wireless communication is used in almost every field of modern life.

Applications

Mobile Communication
Wi-Fi Networks
Bluetooth Devices
Satellite Communication
GPS Navigation
Internet of Things (IoT)
Healthcare Monitoring
Military Communication
Smart Homes
Online Banking

4. Recent Trends in Wireless Communication

5G Networks
Internet of Things (IoT)
Artificial Intelligence in Networks
Cloud-Based Communication
Smart Cities
Vehicle-to-Vehicle Communication (V2V)
6G Research

5. Challenges in Wireless Communication

A) Bandwidth

Bandwidth is the maximum amount of data that can be transmitted over a communication channel in one second.

Problems

Limited spectrum availability.
Network congestion.
Reduced speed.

B) Fading

Fading is the variation in the strength of a received wireless signal due to obstacles, distance and environmental conditions.

Causes

Buildings
Trees
Weather
Movement of users

Effects

Weak signal.
Call drops.
Slow Internet speed.

C) Interference

Interference occurs when multiple wireless signals overlap, reducing communication quality.

Types

Co-channel Interference
Adjacent Channel Interference
Electromagnetic Interference

Effects

Poor signal quality.
Data loss.
Reduced network performance.

6. Basics of Antenna

An antenna is a device that transmits and receives electromagnetic waves.

Functions

Transmit signals.
Receive signals.
Convert electrical energy into radio waves.

Basic Antenna Parameters

Parameter	Description
Gain	Ability to focus radio signals.
Bandwidth	Frequency range supported.
Radiation Pattern	Direction of transmitted signal.
Polarization	Orientation of electromagnetic waves.
Efficiency	Power conversion efficiency.

Advantages of Wireless Communication

Easy installation.
Supports mobility.
Low maintenance.
Fast communication.
Scalable network.

Disadvantages

Security risks.
Signal interference.
Limited bandwidth.
Coverage limitations.
Environmental effects.

Unit I Summary

Wireless communication transfers data without cables.
Communication evolved from 1G to modern 5G.
Wireless systems provide mobility and flexibility.
Main challenges are bandwidth, fading and interference.
An antenna is used to transmit and receive radio signals.

Important University Questions

Explain the evolution of Wireless Communication.
Differentiate Wireless and Wired Communication.
Explain the applications of Wireless Communication.
Describe recent trends in Wireless Communication.
Explain Bandwidth, Fading and Interference.
Define an Antenna and explain its basic parameters.
Write short notes on Wireless Communication.
List the advantages and disadvantages of Wireless Communication.

📡 Unit II – Wireless Transmission Basics

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1. Frequency Spectrum Overview

The frequency spectrum is the complete range of electromagnetic frequencies used for wireless communication. Different frequency bands are allocated for different applications.

Band	Frequency Range	Applications
LF	30–300 kHz	Navigation
MF	300 kHz–3 MHz	AM Radio
HF	3–30 MHz	Shortwave Radio
VHF	30–300 MHz	FM Radio, TV
UHF	300 MHz–3 GHz	Mobile, Wi-Fi, GPS
SHF	3–30 GHz	Satellite, Radar, 5G

2. Radio Propagation

Radio propagation is the process by which radio waves travel from the transmitter to the receiver.

Types of Radio Propagation

Ground Wave Propagation – Travels along the Earth's surface.
Sky Wave Propagation – Reflected by the ionosphere.
Line-of-Sight (LOS) – Direct communication between antennas.

3. Modulation

Modulation is the process of combining the information signal with a high-frequency carrier signal for efficient transmission.

Need for Modulation

Long-distance communication.
Efficient use of antennas.
Reduced interference.
Better signal quality.

4. Amplitude Shift Keying (ASK)

ASK is a digital modulation technique where the amplitude of the carrier signal changes according to the digital data, while frequency and phase remain constant.

Applications

RFID Systems
Remote Controls
Low-speed Communication

5. Frequency Shift Keying (FSK)

FSK is a digital modulation technique where the frequency of the carrier changes according to binary data, while amplitude remains constant.

Applications

Caller ID
Modems
Telemetry

6. Phase Shift Keying (PSK)

PSK is a digital modulation technique where the phase of the carrier signal changes according to digital data.

Advantages

High data rate.
Better noise immunity.
Efficient bandwidth utilization.

Applications

Wi-Fi
Satellite Communication
4G and 5G Networks

Difference Between ASK, FSK and PSK

Technique	Changed Parameter	Main Advantage
ASK	Amplitude	Simple Implementation
FSK	Frequency	Better Noise Performance
PSK	Phase	High Data Rate

7. Multiplexing

Multiplexing is the technique of transmitting multiple signals through a single communication channel to improve bandwidth utilization.

Types of Multiplexing

Frequency Division Multiplexing (FDM)

Each signal uses a separate frequency band.
Used in Radio and Television Broadcasting.

Time Division Multiplexing (TDM)

Each signal is transmitted during a specific time slot.
Used in Digital Telephone Networks.

Code Division Multiplexing (CDM)

Each user is assigned a unique code.
All users share the same frequency simultaneously.
Used in CDMA Mobile Networks.

Difference Between FDM, TDM and CDM

Technique	Resource Shared	Example
FDM	Frequency	FM Radio
TDM	Time	Digital Telephone
CDM	Unique Code	CDMA Networks

8. Noise

Noise is any unwanted electrical signal that disturbs the transmitted signal and reduces communication quality.

Effects

Signal distortion.
Reduced data accuracy.
Communication errors.

9. Interference

Interference occurs when multiple wireless signals overlap and disturb each other.

Types

Co-channel Interference
Adjacent Channel Interference
Electromagnetic Interference

10. Fading and Its Effects

Fading is the variation in received signal strength due to obstacles, distance, reflection and atmospheric conditions.

Effects

Call drops.
Slow Internet speed.
Poor voice quality.
Data transmission errors.

Methods to Reduce Fading

Diversity techniques.
Power control.
Error correction coding.
Adaptive modulation.

Unit II Summary

Frequency spectrum is divided into different communication bands.
Radio waves propagate through Ground Wave, Sky Wave and Line-of-Sight methods.
ASK, FSK and PSK are common digital modulation techniques.
FDM, TDM and CDM allow multiple users to share communication channels.
Noise, interference and fading reduce communication quality.

Important University Questions

Explain the Frequency Spectrum with applications.
Describe different types of Radio Propagation.
Define Modulation and explain its need.
Explain ASK, FSK and PSK.
Differentiate ASK, FSK and PSK.
Explain FDM, TDM and CDM.
Differentiate FDM, TDM and CDM.
What is Noise? Explain its effects.
What is Interference? Explain its types.
Explain Fading and methods to reduce it.

📱 Unit III – Cellular Concepts and Mobile Radio Systems

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1. Cellular System

A Cellular System divides a large geographical area into small regions called cells. Each cell is served by a Base Station (BS), enabling efficient communication and frequency reuse.

Advantages

High network capacity.
Efficient use of frequency spectrum.
Supports user mobility.
Wide coverage area.
Reduced interference.

2. Cellular System Architecture

A cellular network consists of several components working together to provide wireless communication services.

Main Components

Mobile Station (MS)
Base Station (BS)
Base Station Controller (BSC)
Mobile Switching Center (MSC)
Home Location Register (HLR)
Visitor Location Register (VLR)

Component	Function
Mobile Station (MS)	User's mobile phone.
Base Station (BS)	Communicates with mobile devices.
BSC	Controls multiple base stations.
MSC	Handles call routing and switching.
HLR	Stores permanent subscriber information.
VLR	Stores temporary subscriber information.

3. Frequency Reuse

Frequency Reuse is the technique of using the same frequency channels in different cells that are sufficiently far apart to avoid interference.

Advantages

Efficient spectrum utilization.
Increased network capacity.
Reduced operating cost.
Supports more users.

4. Handoff (Handover)

Handoff is the process of transferring an active call or data session from one cell or base station to another without interrupting communication.

Types of Handoff

Hard Handoff – Old connection is broken before the new connection is established.
Soft Handoff – New connection is established before the old connection is released.

Advantages

Continuous communication.
Reduced call drops.
Better user experience.

5. Roaming

Roaming allows mobile users to continue using communication services when they move outside their home network into another operator's network.

Types of Roaming

National Roaming
International Roaming

Benefits

Communication anywhere.
Continuous mobile connectivity.
Improved customer convenience.

6. Mobile Radio Standards

Mobile radio standards define the technical specifications used for mobile communication systems.

Examples

GSM
CDMA
UMTS
LTE
5G NR

7. Evolution from 1G to 5G

Generation	Technology	Main Features
1G	Analog	Voice Calls
2G	GSM	Digital Voice, SMS
3G	UMTS	Internet, Video Calling
4G	LTE	HD Streaming, High-Speed Internet
5G	5G NR	Ultra-fast Speed, IoT, Smart Cities

8. Advances in Mobile Communication

5G Networks
Internet of Things (IoT)
Artificial Intelligence Integration
Cloud Computing
Edge Computing
Smart Healthcare
Autonomous Vehicles
Smart Cities

Difference Between Handoff and Roaming

Handoff	Roaming
Movement between cells.	Movement between networks.
Occurs during an active call.	Occurs when entering another operator's network.
Usually automatic.	Requires roaming support.

Advantages of Cellular Systems

Efficient frequency reuse.
Supports a large number of users.
High mobility.
Reliable communication.
Wide coverage.

Unit III Summary

Cellular systems divide areas into small cells.
Frequency reuse increases network capacity.
Handoff ensures uninterrupted communication.
Roaming enables communication outside the home network.
Mobile communication has evolved from 1G to 5G.
Modern technologies include IoT, AI and Edge Computing.

Important University Questions

Explain the Cellular System Architecture.
What is Frequency Reuse? Explain its advantages.
Explain Handoff and its types.
What is Roaming? Explain its types.
Describe Mobile Radio Standards.
Explain the evolution from 1G to 5G.
Write short notes on Advances in Mobile Communication.
Differentiate Handoff and Roaming.
List the advantages of Cellular Systems.
Explain the functions of HLR and VLR.

📱 Unit IV – Mobile Communication Systems

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1. GSM (Global System for Mobile Communication)

GSM is a second-generation (2G) digital mobile communication standard used for voice calls, SMS and basic data services. It is one of the most widely used mobile communication technologies in the world.

Features of GSM

Digital communication.
High voice quality.
SMS support.
International roaming.
SIM card support.

2. GSM Architecture

The GSM architecture consists of three major subsystems that work together to provide mobile communication services.

Base Station Subsystem (BSS)
Network Switching Subsystem (NSS)
Operation & Support Subsystem (OSS)

3. Base Station Subsystem (BSS)

The BSS provides communication between the mobile station and the network. It consists of BTS and BSC.

Components

Base Transceiver Station (BTS)
Base Station Controller (BSC)

4. Base Transceiver Station (BTS)

BTS is the equipment that communicates directly with mobile phones using radio signals.

Functions

Transmits radio signals.
Receives radio signals.
Provides wireless coverage.
Supports voice and data communication.

5. Base Station Controller (BSC)

BSC controls multiple BTSs and manages radio resources within the GSM network.

Functions

Controls BTS operations.
Allocates radio channels.
Performs handoff management.
Manages network traffic.

6. Mobile Switching Center (MSC)

MSC is the central switching system responsible for call setup, routing and mobility management.

Functions

Call switching.
Call routing.
Roaming support.
Billing information.

7. Home Location Register (HLR)

HLR is a permanent database that stores subscriber information.

Stores

User identity.
Mobile number.
Service subscription.
Current location information.

8. Visitor Location Register (VLR)

VLR is a temporary database that stores information about subscribers currently visiting a network area.

Functions

Stores temporary user data.
Supports roaming.
Reduces HLR access.

9. Authentication Center (AUC)

AUC verifies the identity of subscribers and provides security for the GSM network.

Functions

User authentication.
Encryption key generation.
Network security.

10. Equipment Identity Register (EIR)

EIR stores the IMEI numbers of mobile devices and checks whether a device is valid or blacklisted.

Functions

Maintains IMEI database.
Blocks stolen devices.
Improves network security.

11. GSM Protocols

GSM protocols define the communication rules between different GSM network components.

Main Protocols

Radio Resource (RR)
Mobility Management (MM)
Call Control (CC)

12. GPRS (General Packet Radio Service)

GPRS is a packet-switched data service introduced in GSM networks to provide Internet access.

Features

Packet data transmission.
Always-on Internet connection.
Supports web browsing and email.

13. UMTS (3G)

UMTS is the third-generation (3G) mobile communication system that provides higher data speeds than GSM.

Applications

Video Calling.
Mobile Internet.
Online Multimedia.

14. LTE (4G)

LTE (Long Term Evolution) is a fourth-generation mobile technology that offers high-speed Internet and low latency.

Features

High-speed data transfer.
HD video streaming.
Low latency.
Voice over LTE (VoLTE).

15. 5G Architecture

5G is the latest generation of mobile communication technology designed for ultra-fast communication and massive device connectivity.

Features

Very high speed.
Ultra-low latency.
Massive IoT support.
Network slicing.
Improved reliability.

16. Applications of GSM

Voice Communication.
SMS Services.
Mobile Banking.
GPS Tracking.
Machine-to-Machine (M2M) Communication.
IoT Devices.

Difference Between GSM, 3G, 4G and 5G

Technology	Main Feature	Typical Use
GSM (2G)	Voice & SMS	Calling
UMTS (3G)	Mobile Internet	Video Calling
LTE (4G)	High-Speed Internet	Streaming
5G	Ultra-Fast & Low Latency	IoT, Smart Cities, AI

Unit IV Summary

GSM is a widely used 2G digital mobile communication system.
BSS includes BTS and BSC.
MSC performs switching and call routing.
HLR and VLR manage subscriber information.
AUC provides authentication and EIR manages device identity.
GPRS introduced packet-based Internet services.
UMTS represents 3G, LTE represents 4G and 5G provides ultra-fast communication.

Important University Questions

Explain GSM Architecture with a neat diagram.
Describe the functions of BSS, BTS and BSC.
Explain the functions of MSC.
Differentiate HLR and VLR.
Explain the role of AUC and EIR.
Write short notes on GSM Protocols.
Explain GPRS with its features.
Describe UMTS (3G).
Explain LTE (4G) architecture and features.
Explain 5G architecture and its applications.
Compare GSM, 3G, 4G and 5G.
List the applications of GSM.

📶 Unit V – Wireless Networks

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1. Wireless Networks

A Wireless Network is a communication network in which devices exchange data without physical cables using radio waves, infrared waves or microwaves.

Advantages

Easy installation.
Supports user mobility.
Flexible network expansion.
Lower installation cost.
Quick deployment.

2. IEEE 802.11 (Wi-Fi)

IEEE 802.11 is the international standard for Wireless Local Area Networks (WLAN). It allows devices such as laptops, smartphones and tablets to connect to the Internet wirelessly.

Features

High-speed wireless communication.
Supports multiple users.
Easy installation.
Secure communication using WPA/WPA2/WPA3.

Applications

Homes
Offices
Schools
Colleges
Airports
Public Wi-Fi Hotspots

3. MAC Protocols in Wireless LAN

The Medium Access Control (MAC) protocol controls how multiple wireless devices share the same communication channel efficiently.

Main Functions

Channel access control.
Avoid data collisions.
Reliable frame transmission.
Error detection.

MAC Techniques

CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance)
RTS/CTS Mechanism
Acknowledgement (ACK)

4. Bluetooth

Bluetooth is a short-range wireless communication technology used for exchanging data between nearby devices operating in the 2.4 GHz ISM band.

Features

Short-range communication.
Low power consumption.
Secure pairing.
Low-cost technology.

Applications

Wireless Earphones
Smart Watches
Wireless Keyboard
Wireless Mouse
File Sharing
Car Audio Systems

5. IEEE 802.15 (Wireless Personal Area Network - WPAN)

IEEE 802.15 defines standards for Wireless Personal Area Networks (WPAN), providing communication over short distances.

Applications

Bluetooth
ZigBee
Wearable Devices
Home Automation
IoT Sensors

6. WiMAX (Worldwide Interoperability for Microwave Access)

WiMAX is based on the IEEE 802.16 standard and provides broadband wireless Internet access over long distances.

Features

Long-range communication.
High-speed Internet.
Supports rural connectivity.
Broadband wireless access.

Applications

Broadband Internet
Rural Networks
Campus Networks
Business Connectivity

7. Other WLAN Technologies

ZigBee
NFC (Near Field Communication)
Infrared Communication (IR)
RFID (Radio Frequency Identification)
Li-Fi (Light Fidelity)

Comparison of Wireless Technologies

Technology	Standard	Range	Main Application
Wi-Fi	IEEE 802.11	Medium	Internet Access
Bluetooth	IEEE 802.15	Short	Personal Devices
WiMAX	IEEE 802.16	Long	Broadband Access
ZigBee	IEEE 802.15.4	Short	IoT Devices
NFC	ISO/IEC 18092	Very Short	Contactless Payments

Advantages of Wireless Networks

Mobility.
Easy installation.
Low maintenance cost.
Flexible deployment.
Supports multiple users.

Limitations

Security threats.
Signal interference.
Limited bandwidth.
Coverage issues.
Lower reliability than wired networks.

Unit V Summary

Wireless networks transmit data without cables.
IEEE 802.11 defines Wi-Fi standards.
MAC protocols control channel access in WLAN.
Bluetooth provides short-range communication.
IEEE 802.15 supports WPAN technologies.
WiMAX provides long-distance broadband wireless communication.
ZigBee, NFC and RFID are important wireless technologies.

Important University Questions

Explain IEEE 802.11 (Wi-Fi) with features and applications.
Describe MAC Protocols used in Wireless LAN.
Explain Bluetooth technology with applications.
What is IEEE 802.15 (WPAN)? Explain its uses.
Explain WiMAX with features and applications.
Write short notes on ZigBee, NFC and RFID.
Differentiate Wi-Fi, Bluetooth and WiMAX.
List the advantages and limitations of Wireless Networks.

🔒 Unit VI – Threats and Applications of Wireless Communication

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1. Wireless Security Threats

Wireless networks transmit data through radio waves. Since signals travel through the air, they are more vulnerable to security threats than wired networks.

Major Threats

Eavesdropping
Sniffing
Denial of Service (DoS)
Jamming Attack
MAC Spoofing
IP Spoofing

2. Eavesdropping

Eavesdropping is the unauthorized listening to private wireless communication to obtain confidential information.

Effects

Loss of privacy.
Data theft.
Identity theft.
Financial loss.

Prevention

Use encryption.
Enable WPA2/WPA3 security.
Use VPN.
Avoid public Wi-Fi for sensitive work.

3. Sniffing

Sniffing is the process of capturing and monitoring data packets traveling through a wireless network.

Types

Passive Sniffing
Active Sniffing

Prevention

Use encrypted communication.
Enable HTTPS.
Use secure Wi-Fi passwords.

4. Denial of Service (DoS) Attack

A DoS attack attempts to make a wireless network or server unavailable by sending excessive traffic and exhausting system resources.

Effects

Network congestion.
Service interruption.
Slow performance.
Downtime.

Prevention

Firewalls.
Intrusion Detection Systems.
Traffic filtering.
Rate limiting.

5. Jamming Attack

A Jamming Attack deliberately transmits radio signals to interfere with legitimate wireless communication.

Effects

Signal disruption.
Call drops.
Loss of communication.

Prevention

Frequency hopping.
Spread spectrum techniques.
Signal monitoring.

6. MAC Spoofing

MAC Spoofing is the technique of changing a device's MAC address to impersonate another device on the network.

Risks

Unauthorized network access.
Identity impersonation.
Security bypass.

7. IP Spoofing

IP Spoofing is the creation of Internet Protocol packets with a fake source IP address to hide the attacker's identity.

Effects

Unauthorized access.
Network attacks.
DoS attacks.

Comparison of Wireless Threats

Threat	Main Purpose	Impact
Eavesdropping	Listen to communication	Privacy Loss
Sniffing	Capture packets	Data Theft
DoS	Stop services	Network Down
Jamming	Block wireless signals	Communication Failure
MAC Spoofing	Fake MAC Address	Unauthorized Access
IP Spoofing	Fake IP Address	Identity Hiding

8. Applications of Wireless Communication

Consumer Applications

Mobile Phones
Wi-Fi Internet
Smart TVs
Bluetooth Devices
Smart Homes

Enterprise Applications

Wireless Office Networks
Cloud Computing
Video Conferencing
Remote Working
Inventory Management

Healthcare Applications

Remote Patient Monitoring
Telemedicine
Wireless Medical Sensors
Smart Health Devices

Transport Applications

GPS Navigation
Vehicle Tracking
Traffic Management
Connected Vehicles

Military Applications

Secure Communication
Satellite Communication
Drone Communication
Radar Systems
Battlefield Communication

Advantages of Wireless Communication

Mobility.
Easy installation.
Fast deployment.
Scalable network.
Supports modern applications.

Limitations

Security threats.
Interference.
Limited bandwidth.
Coverage issues.
Signal fading.

Unit VI Summary

Wireless networks face threats such as eavesdropping, sniffing and spoofing.
Encryption, VPNs and strong authentication improve security.
Wireless communication is widely used in consumer, enterprise, healthcare, transport and military sectors.
Modern wireless technologies provide mobility, flexibility and high-speed communication.

Important University Questions

Explain Eavesdropping and its prevention methods.
What is Sniffing? Explain its types.
Describe the Denial of Service (DoS) attack.
Explain Jamming attacks with preventive measures.
Differentiate MAC Spoofing and IP Spoofing.
Explain the applications of Wireless Communication in consumer and enterprise sectors.
Describe Healthcare, Transport and Military applications of Wireless Communication.
Write short notes on Wireless Security Threats.
List the advantages and limitations of Wireless Communication.
Explain different types of attacks on Wireless Networks.

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Thursday, July 30, 2026