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authorNao Pross <np@0hm.ch>2021-10-13 18:12:08 +0200
committerNao Pross <np@0hm.ch>2021-10-13 18:16:26 +0200
commit20e54b3cf198f17e05a3c7e8716138717447aa32 (patch)
tree38afe78b2fe6b71d59e6c3051ca0ac746d35bc70 /tests/Simulation/AM
parentMove paragraph to introduction (diff)
downloadFading-20e54b3cf198f17e05a3c7e8716138717447aa32.tar.gz
Fading-20e54b3cf198f17e05a3c7e8716138717447aa32.zip
Create QPKS simulation
The current flow diagram does the following: - Generate a QPKS constellation from a random bit source. The constellation is parametrized by the 'Constellation Rect. Object' and the variables 'sps' (Samples Per Symbol) and 'excess_bw' (Excess Bandwidth). - Send the modulated signal through a AWGN channel. Noise channel taps are controlled with the 'taps' variable, the other paramters are given through the 'QT GUI Range' objects. - Display the constellation diagram as well as the time and frequency domain plots of the signal after the channel (receiver side). - Synchronize the clock using a polyphase clock sync with root raised cosine filters. The number of filters is stored in 'nfilts' and the filter themselves are in 'rcc_taps'. - Finally, display the constellation after the RCC filters. What is still missing: - Multipath fading taps in the channel model (for later) - Equalization on the receiver side. PROBLEM: The wiki tutorial targets GNU Radio 3.9, and uses 'Linear Equlizer' and 'Adaptive Algorithm' blocks which are not available in GNU Radio 3.8. We need to use 'CMA Equalizer' and 'LMS DD Equalizer' and figure out their parameters instead. Though this should not be hard. - Phase and Fine Frequency Correction. - Decode the message.
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