ETTC'2003 - SEE

• Output: Samples
Module ‘Nyquist_filter2’:
Same as ‘Nyquist_filter1’
Module ‘Demodulator_QPSK’:
• Objective: QPSK demodulation
• Parameters: Downsampling
• Input: Samples
• Output: Samples
Module ‘Viterbi_decoder’:
• Objective: Viterbi decoding
• Parameters: Path lengrh
• Input: Samples
• Output: Bits
Module ‘Compute_ber’:
• Objective: Bit error rate
• Parameters: Number of bit errors
• Input: Bits
• Output: NA
Next figure shows an example of simulation
run that allows to obtain a Bit Error Rate of
2.3*10 -4 at Eb/N0=3.34dB with Nyquist filters
on 5 symbols and a quantization of 3 bits for
the Viterbi decoder
Figure 8 : Simulation run
CHAIN EXPLOITATION
The chain can now be exploited using several
computers to speed-up global simulation time.
A case-study allows to test several discrete
values of the Eb/N0 parameter.
Next figure shows an example of exploitation
run
Figure 9 : Exploitation run
CONCLUSION
In this paper, we have shown the interest of
JUZZLE to simulate a transmission chain.
These results can be extended to other
technical area, for instance electronic,
mechanic, aeronautic,…
Moreover, new JUZZLE developments will
propose soon:
- some examples to help users
- debug execution mode with graphical
plots of exchanged data
- event driven simulation support
For any other information, code and regular
news are published on http://www.juzzle.com.
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