https://github.com/flandrade/cdma-simulation

CDMA communication system using Matlab. #github
https://github.com/flandrade/cdma-simulation

awgn-channel cdma-communication communication-systems matlab plots quantization simulation users-voices

Last synced: 7 months ago
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CDMA communication system using Matlab. #github

• Host: GitHub
• URL: https://github.com/flandrade/cdma-simulation
• Owner: flandrade
• License: mit
• Created: 2015-12-15T18:07:53.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2016-01-21T18:00:08.000Z (over 9 years ago)
• Last Synced: 2024-03-19T03:32:03.712Z (about 1 year ago)
• Topics: awgn-channel, cdma-communication, communication-systems, matlab, plots, quantization, simulation, users-voices
• Language: Matlab
• Homepage:
• Size: 820 KB
• Stars: 17
• Watchers: 4
• Forks: 5
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Simulation of CDMA communication system

This program simulates a basic CDMA communication system using Matlab. It includes the following components:

![Diagram](https://github.com/flandrade/cdma-simulation/blob/master/images/diagram.png)

**cdma.m** is the main file.

## Components and options

### Input voices

Four .wav files to simulate four users (variables x1, x2, x3 and x4). The program plots these input signals.

### Quantization

This program plots the first input signal with the levels of quantization and the quantized signal.

**nivel**: the number of levels for quantization.

**opcion**: quantization processes. Available options:

- 1 - Uniform

- 2 - Mu-Law

- 4 - A-Law

**errorcuantizacion**: quantization error.

### Multiple Access

**opt**: type of code for CDMA access. Available options:

- 1 = Orthogonal (Synchronous)

- 2 = Random (Asynchronous)

**gp**: GP value for correlation matrix.

### Modulation

BPSK modulation is performed.

### AWGN Channel

This module simulates a AWGN channel where noise is added to the communication.

**ebno**: Eb/N0. It is the energy per bit to noise power spectral density ratio. Value between 1 and 10, where 10 is for the least noisy channel.

## Output

### BER Curves  

This module uses a loop in order to simulate an AWGN channel with several Eb/N0 values (between 1 and 10)m and it plots the BER curve for the selected voice.

Demodulation and the division of users are performed in this loop.

**errorpe**: probability of error. It gives the average rate of occurrence of decoding errors.

### Final message

You can either select to play one user voice or all users voices. The program plots the output signal.

## Graphs

![Plots](https://github.com/flandrade/cdma-simulation/blob/master/images/plot.jpg)

### Acknowledgements

This program was developed during the communication course "Comunicación y codificación digital" at Universidad de las Fuerzas Armadas ESPE.