End-to-End Communication System with BladeRF and GNU Radio

Welcome to the End-to-End Communication System repository! This project showcases the implementation of a comprehensive communication system using BladeRF and GNU Radio software. Whether you're interested in digital communication, encryption, or real-time audio transmission, this repository has something for you.

Table of Contents

1. Overview
2. Features
3. Components
   • Digital Communication and Preamble Handling
   • Encryption and Decryption
   • Real-Time Audio Transmission
4. Getting Started
5. Contributions
6. License
7. Contact

Overview

The project focuses on designing and implementing a versatile communication system capable of transmitting and receiving various types of data. Leveraging the power of Software-Defined Radio (SDR) technology, it provides a platform for experimenting with different modulation techniques and signal processing algorithms.

Features

• BladeRF Integration: Utilizes the BladeRF platform for radio frequency (RF) signal processing.
• GNU Radio Implementation: Implements signal processing and modulation/demodulation using GNU Radio blocks.
• End-to-End Communication: Demonstrates a complete communication system, including transmission and reception of data.
• Modulation Techniques: Supports various modulation techniques such as Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Quadrature Amplitude Modulation (QAM).
• Graphical User Interface (GUI): Provides a user-friendly interface for configuring and monitoring the communication system parameters.

Components

1. Digital Communication and Preamble Handling

This component manages digital communication between systems and handles preamble sequences.

Dependencies:

• Python 3.x
• Libraries: Crypto, base64

Digital Communication (digital_com.py):

• Manages digital communication between systems.

• Provides functions for encoding and decoding digital data.

• Functionality:

  • Facilitates communication between systems using digital data encoding and decoding techniques.

• Encoding:

  • Provides functions to encode digital data into a format suitable for transmission.
  • Utilizes encoding schemes such as base64 for efficient data representation.

• Decoding:

  • Offers functions to decode received digital data back into its original format.
  • Ensures accurate retrieval of transmitted information.

• Data Integrity:

  • Implements mechanisms to maintain data integrity during transmission.
  • Utilizes error detection and correction techniques to minimize data loss or corruption.

• Error Handling:

  • Incorporates error handling mechanisms to manage transmission errors and ensure reliable communication.
  • Detects and addresses errors in transmitted data to maintain communication integrity.

Preamble Script (preamble.py):

• Functions to add and remove preambles from files.

• Detects and removes preambles at the beginning and end of files.

• Functionality:

  • Manages the insertion and removal of preamble sequences in transmitted data streams.
  • Ensures synchronization and alignment between transmitting and receiving systems.

• Preamble Generation:

  • Generates preamble sequences to precede transmitted data.
  • Incorporates unique patterns or signatures for easy detection and synchronization.

• Preamble Detection:

  • Implements algorithms to detect and extract preamble sequences from received data streams.
  • Utilizes pattern matching or synchronization techniques to identify preamble boundaries.

• Synchronization:

  • Ensures synchronization between transmitting and receiving systems by aligning data streams based on detected preamble sequences.
  • Facilitates accurate data reception and interpretation.

Integration:

• These components seamlessly integrate into the end-to-end communication system, enhancing data reliability, integrity, and synchronization.
• Digital Communication and Preamble Handling modules work in conjunction with encryption, real-time transmission, and other system components to provide a comprehensive communication solution.

2. Encryption and Decryption

Encryption (encrypt.py)

• Purpose: Encrypts a file using XOR operation.
• Key Range: Uses a single-byte key (0-255).
• Key: Fixed key 122 for XOR operation.
• Process:
  • Reads file as byte array.
  • XORs each byte with the key.
  • Writes encrypted data back to file.

Decryption (decrypt.py)

• Purpose: Decrypts a file encrypted with XOR operation.
• Key Range: Uses the same single-byte key (0-255) as encryption.
• Key: Fixed key 122 for XOR operation.
• Process:
  • Reads encrypted file as byte array.
  • XORs each byte with the key to decrypt.
  • Writes decrypted data back to file.

Key Considerations:

• Security: Basic XOR encryption is not secure for sensitive data.
• Key Space: Limited to a single byte (0-255).
• Preamble: Typically, no explicit preamble handling mentioned in the provided scripts.

3. Real-Time Audio Transmission

This component focuses on transmitting audio data using analog technologies, ensuring robust performance without synchronization issues common in digital communication.

Dependencies:

• Python 3.10.1.1
• GNU Radio 3.10.1.1
• PyQt5

Components:

• Real-Time FM Class: Inherits from gr.top_block and Qt.QWidget. Sets up the GUI for the GNU Radio flowgraph.
  • Initialization: Initializes variables such as volume and sample rate. Sets up GUI elements using PyQt5.
  • Blocks:
    • Volume Control: Enables volume adjustment via a slider.
    • Soapy BladeRF Sink: Sends data to the BladeRF device for transmission.
    • Wavfile Source: Reads audio data from a WAV file.
    • Multiply Constants: Adjusts volume and applies modulation.
    • Analog NBFM TX: Generates narrow-band FM signals for transmission.
    • QT GUI Sink: Displays time-domain and frequency-domain plots.
  • Connections: Establishes data flow between various blocks.
  • Event Handling: Manages the close event to save settings and stop the flowgraph.
  • Main Function: Initializes the flowgraph, starts it, and displays the GUI. Handles signals for graceful termination.

Getting Started

To set up and use the end-to-end communication system, follow these steps:

1. Clone the Repository: Clone this repository to your local machine using Git.

Copy code git clone https://github.com/LasiduDilshan/Software-Defined-Radio.git

2. Install Dependencies: Ensure you have GNU Radio and BladeRF drivers installed on your system. Refer to the documentation for installation instructions.

3. Configure BladeRF: Connect your BladeRF device to the computer and configure it using the provided Python scripts or command-line tools.

4. Run GNU Radio Flowgraphs: Execute the GNU Radio flowgraphs for the transmitter and receiver to initiate communication. Adjust parameters as needed.

5. Monitor and Analyze: Use the GUI or command-line tools to monitor system performance, visualize signals, and analyze transmitted and received data.

Contact

For any questions, suggestions, or feedback, please feel free to contact the project maintainer at dilshanlasindu0@gmail.com. Your input is highly appreciated!