Month: November 2013

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DSP based Software Defined Radio for FM Demodulation

DSP tools for FM demodulation.

By Ali Naveed, et al.

https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Attachments/34520/Design%20Report.pdf

Abstract:

Software Defined Radio is an emerging technology that has been an active re-search topic for over a decade. The terms software defined radio and software radio are used to describe radios whose implementation is largely software-based. These radios are reconfigurable through software updates. There are also wider definitions of the concept. A software defined uses digital signal processing (DSP) for coding, decoding, modulating, and demodulating data.

The proper implementation of SDR is far away from our approach and the experience which we have gained during the three years studies in the B.E program of Industrial Electronics. That is why, this project is the design, construction, and testing of an FM receiver. The design is split into two portions, the analog FM front end and the digital demodulator. The job of the front end is to receive and down convert the RF signal to a frequency that is low enough to be processed by a DSP processor.

The second portion of the design is the demodulator. The phase lock loop method of demodulating FM signals is used. The phase lock loop demodulator is designed in the digital domain on a DSP processor.

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Updating ruby in Mac OS

5/2014 These instructions failed on Snow leopard 10.6.8 – see following note:

Note: To install rvm, there are some dependencies – for example gcc – If you have not installed xcode developer tools, or any typical linux tools – rvm will try to install homebew and probably fail. So it may not be practical to update your version of Ruby this way…

original post

Used rvm – explained here – but I have extracted relevant instructions below:

http://stackoverflow.com/questions/3696564/how-to-update-ruby-to-1-9-x-on-mac

start here:

1. Update /etc/paths as explained here:

sudo nano /etc/paths

Add 2 following lines:

/opt/local/bin
/opt/local/sbin

 

then reboot your terminal

2. Then install rvm:

As The Tin Man suggests (above) RVM (Ruby Version Manager) is the Standard for upgrading your Ruby installation on OSX: https://rvm.io

To get started, open a Terminal Window and issue the following command:

\curl -L https://get.rvm.io | bash -s stable --ruby

( you will need to trust the RVM Dev Team that the command is not malicious – if you’re a paranoid penguin like me, you can always go read the source: https://github.com/wayneeseguin/rvm )

3. When it’s complete you need to restart the terminal

4. To get the rvm command working.

rvm list known

( shows you the latest available versions of Ruby )

rvm install ruby-2.0.0-p247

For a specific version, followed by

rvm use ruby-2.0.0-p247

or if you just want the latest (current) version:

rvm install current
rvm use current

( installs the current stable release – at time of writing ruby-2.0.0-p247 – please update this wiki when new versions released )

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ep-4xx13 DSP – week 12

Mashups

notes

tools

Holiday book recommendations:

Assignment

Work on final projects. Due in class December 16th