OFDM Based Wireless Encryption and Decryption Message Transfer System for Military Applications

What is OFDM

 Short for Orthogonal Frequency Division Multiplexing, an FDM modulation technique for transmitting large amounts of digital data over a radio wave. OFDM works by splitting the radio signal into multiple smaller sub-signals that are then transmitted simultaneously at different frequencies to the receiver. OFDM reduces the amount of crosstalk in signal transmissions

Need:

The need for this project arises when we want the data communication to be protected from others. This is highly essential in the military field and especially during war times. Because during war periods when a particular army wants to send a message to remotely located units, which belong to the same army, in between any person can trap the data when it is transmitted through wireless. 

                 Our aim of the project is to protect the data from the ensnares. To accomplish this, we have used a PC as a sender and PIC microcontroller as a receiver station. The message to be sent is fed in to the computer for different units. The computer will Encrypt the data using generating a duplicate Character for a real one.

        At the receiving end the PIC microcontroller then Decrypts the Received data and displays the message on the display. The communication takes place through a Wireless RF Transmitter and Receiver operating at 433.92 MHz

we can also use CRO at the transmitting point to view the Encrypted data.

To ensure the security level at the receiving end we have a password protection.  Once the Message is received the unit will give an alarm message so that one can know that the message has arrived.  Then he must enter the password through the keypad.  If the password matches then  he is allowed to view the data.

Software Requirements

• MPLAB IDE v6.0
• HITECH C COPILER
• MICROPRO – PIC programmer Software

Hardware Requirements

• PIC 16F877A Microcontroller
• LCD display 2x16 Char
• LED
• Matrix keypad
• RF Receiver
• Alaram
• Capacitors
• Transistors
• PIC Programmer kit
• Regsistors
• Computer

Application Usage:

• Military Applications
• Private Sectors
• Satellite Commnication