In the course we gradually build up a wireless communication system, starting with a simulation chain in Matlab, then continuing with wireless transmission using microphones and loudspeakers so that we can hear the messages being sent, and finally we transition to a software defined radio to create wireless communication links in the ISM-band at 2.4 GHz.

Here you find news and some hints for the project.

Help sessions

The help sessions will take place twice a week. If you have anything to discuss, make sure to be there in time as Guoda will leave after a short while if there are not any issues to discuss.

During HT1 2023, the help sessions take place Tuesdays 13-14 and Thursdays 13-14 in E 4119.

Project description part 1, HT1

The project description is now available for part 1: PWC_Part1_23

Useful files: SystemModel1.pdf, SystemModelTask3.pdf

Signals for task 2

Signals for task 3

 

Project description part 2&3, HT2

The project description is now available for part 2: PWC_Part2_23

The project description is now available for part 3: PWC_Part3_23

Recommended reading

Software-Defined Radio for Engineers, by Travis F. Collins, Robin Getz, Di Pu, and Alexander M. Wyglinski, 2018, ISBN-13: 978-1-63081-457-1. We will use this book in the second half of the course, and it covers many of the aspects in the first half as well.

There is a free pdf of the book available, see http://www.analog.com/en/education/education-library/software-defined-radio-for-engineers.html.

 

Hints, part 1

For converting the ASCII code, you may get help from the following matlab code:

wh=2.^[6:-1:0];
m=char(TransmittedBits(1:7)*wh');
for l=2:floor(length(TransmittedBits)/7),
     m=[m char(TransmittedBits(7*(l-1)+1:7*l)*wh')];
end 
m

 

For Task III, you can use the following code for designing the digital filter:

FilteredSignal = filter(B,A,SignalToFilter);

(B,A) need to be selected properly by yourself.

 

Hints, part 2

For transmitting the audio signal, you can use the following code:

tx = audioplayer(DataTrans,SamplingFrequency); 

playblocking(tx);

 

For recording the audio signal, you can directly use build in function audiorecorder, for example:

recorder=audiorecorder(fs,16,1);
recordblocking(recorder,SecSound);
R=getaudiodata(recorder);

 

Hints, part 3

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