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2021-12-03Remove frequency LPF and clean upNao Pross1-48/+46
2021-12-03Fix bug that makes jump estimated frequency to unreasonably high valuesNao Pross1-153/+132
2021-12-03Improve frequency LPFNao Pross1-38/+62
2021-12-03Add a LPF on the frequencyNao Pross1-22/+30
2021-12-03Fix bug when tag is aligned with inp blockNao Pross1-6/+6
2021-12-03Refractor frequency correctionNao Pross1-43/+39
2021-12-02Remove custom blocks from correlator testNao Pross1-19/+2
2021-12-02Begin frequency correction (incomplete)Nao Pross1-25/+40
2021-12-02Implement phase correction in test file with embedded python blockNao Pross1-314/+110
2021-11-28Working access code correlationNao Pross1-59/+736
2021-11-27Start access code cross correlationNao Pross1-62/+754
2021-11-27Update access code processingNao Pross1-14/+33
Fixed: FIR filter samples need to be complex conj
2021-11-25Create test files for correlatorNao Pross1-282/+142
2021-11-24DiscussionNao Pross1-155/+165
2021-11-22Implement frame synchronizationNao Pross1-15/+37
There is an issue somewhere between the mod and demod, since frame synchronization works on a direct path.
2021-11-20Implement Frame ObjectNao Pross1-71/+142
2021-11-18Partially implement xor correlator (untested)Nao Pross1-5/+5
2021-11-18Begin frame sync blockNao Pross1-3/+22
2021-11-17Begin working on frame syncronizationNao Pross1-3/+3
2021-11-17Replace GNURadio scripts with network codeNao Pross1-2/+2
2021-11-15Test UDP connection on sink blockNao Pross1-0/+2
Can be tested locally with: netcat -l4kuv localhost 31415
2021-11-15Create UI Plot sink blockNao Pross1-3/+17
2021-11-15Partially fix framerNao Pross1-161/+52
2021-11-12Create (a new) OOTNao Pross1-81/+185
2021-11-11Create QAM without guiNao Pross1-738/+27
2021-11-10Fading Model und Bildersara1-3/+3
2021-11-08QAM Hardware Vorbereitungsara1-2/+2
2021-11-08QAM / 4-PSK Simulationsara1-10/+29
2021-10-28Implement QPSK TX - RX with USRP hardwareNao Pross1-14/+12
And fix some small issues in QPSK simulation. The signal flow graph was tested with a coaxial cable, as well as with an 2.4 GHz antenna. The constellation diagram looked OK, but the sent data (bytes of lena512color.tiff) were neither decoded nor tested. That is because we need to synchronize data frames with a header thing or something like that (which is still not implemented yet).
2021-10-24Create QPSK simulation without QT GUINaoki Pross1-9/+11
2021-10-24Fix typo in file name QPKS -> QPSKNaoki Pross1-0/+0
2021-10-18Add decoder to QPKS simulationNao Pross1-0/+240
2021-10-14Remove unnecessary subfolder tests/Simulation and move QPSK into new ↵Nao Pross1-0/+0
'simulation' dir
2021-10-14Add Equalizer and Phase + Freq. correction to QPKS simulationNao Pross1-137/+398
Continuing the work of commit 20e54b3cf198f17e05a3c7e8716138717447aa32 Important: - The diagram has been updated to include a CMA equalizer and a costas loop (for phase correction and small frequency correction). TODO: - Decode the signal - Create USRP hardware sinks (RX side, for later) It would be very nice if we manage to find a 'switch' block that allows to have in a single flow diagram both the simulated and "real" signals. NOTE: recall that the USRP gives directly a baseband signal, which means that everything between the channel the costas loop (both included) will not be used when the hardware is connected. Only the (not yet) implemented decoder (and eventually some more filters if needed) will be used. Other notes: - The layout has been updated to use QT Tab widgets (defined on the top left corner). GUI elements can be put into tabs by giving a string '<tab name>@<tab nr>: <grid options>' as GUI hint. - To make the diagram nicer, all GUI sinks (eg. constellations plots of time / freq. plots) are vertically aligned. Constellation above, and time and freq. sinks below. Variables ought to be placed near their respective block, unless they are global, in which case they should go on the top left.
2021-10-13Create QPKS simulationNao Pross1-314/+321
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.
2021-10-12Simulations Versuch von AM und SSBsara1-0/+681
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