Page 15 - Electrical & Electronic Engineering Brochure 2024 WEB

Systems, Signals, DSP and FFT Communications and Digital Radio Techniques

The Systems, signals, DSP and FFT pack introduces students to a number Once students have been through the Systems, signals, DSP and FFT pack they can FLOWCODE
concepts in digital systems including A/D and D/A conversion, Nyquist, Digital move onto the communications and digital radio techniques course. This course
Signal Processing, signal manipulation, Fourier analysis of signals and the FFT allows students to construct and experiment on a wide range of systems based
FLOWCODE
algorithm, and Digital Filters. Students perform a range of experiments that on Sysblocks. Students use a panel with three Sysblocks on to create a sequence
teach them about the details of signal manipulation using a single Sysblock, of communications modulators and encoders, add noise, and then demodulate
pre- written programs created in Flowcode embedded, a signal generator, an / decode the resulting signals. In doing so students understand the parameters
oscilloscope and a spectrum analyser. Students download the programs and of communications systems including Phase Locked Loop performance, signal
carry out a number of experiments that teach them about the parameters to noise ratios, bit error rates and the principles of digital radio techniques. The SYSBLOCKS
and techniques of Signal processing. There is also plenty of chance for creative communications systems students investigate include PLLs, AM, FM, OOK, ASK,
programming using Flowcode embedded for the advanced students who will FSK, BPSK, QAM, QPSK and DSSS. Students work with pre-written programs for
SYSBLOCKS
find that the Sysblocks and Flowcode combination provide the perfect platform Sysblocks. There is also plenty of chance for creative programming using Flowcode
for the rapid creation of signal manipulation systems. for the advanced students who will find that the Sysblocks panel and Flowcode
combination provide the perfect platform for experimentation with digital comms.
The hardware platform includes 3 x Sysblocks panels (encode/modulate, decode/
demodulate, and noise generator) and a mixer board.
Example: Theory of Fourier

This example shows how harmonics can be added to create a square wave. Images show the data flow ELECTRICAL MACHINES
diagram, a composite oscillogram with different numbers of harmonics and a typical spectral plot.
Example: AM transmitter receiver
The equipment allows students to set up AM and FM systems that show some of the principles of digital
radio technology. Here you can see the AM transmitter and receiver Flowcode data flow programs, an
oscillogram of a 1kHz modulated wave and the associated spectral plot. LOCKTRONICS
ELECTRICAL MACHINES

LOCKTRONICS

Example: Digital filters EBLOCKS 2
EBLOCKS 2
Students can construct a wide range of different types of digital filter - including FIR and IIR types - and study Example: Coherent detector
their performance. The images show the simple data flow program, and oscillograms and spectral plots of
signals before and after filtering. With the equipment it is possible to set up various kinds of modulator encoder - demodulator decoder
systems. The first image here shows the Data Flow program in Flowcode. Accompanying code sets up data ALLCODE
packets. Also shown here are the I and Q outputs, constellation plots for 4-QAM and 8-QPSK, an eye diagram
for the system and the Bit Error Rate counter program. TINA
ALLCODE

TINA

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