Commit graph

6 commits

Author SHA1 Message Date
Thomas Kolb bbf7bcf2f0 test/freq_est: add channel simulation 2024-03-30 22:05:02 +01:00
Thomas Kolb d9707ac4a9 test: add test_rx_file 2024-03-30 21:56:00 +01:00
Thomas Kolb f5a367464f Optimized one-shot frequency synchronization
- Ramp-up length increased to 128 symbols (here is room for
  improvement!)
- Try to detect the frequency once during ramp-up. To do so, every
  second symbol is inverted (to remove the +/-1 symbol toggling) and the
  phase difference between neigboring resulting symbols is checked. When
  it is low enough for all symbols, the frequency is estimated and
  corrected. When frequency estimation was done, it is not retried for a
  number of incoming symbols in order to allow the timing estimator to
  converge again.
- This approach was verified in a simulated loopback test with frequency
  offset and AWGN.
2023-05-17 22:28:18 +02:00
Thomas Kolb a7db93ab9e Added test for frequency estimator 2023-05-17 22:26:46 +02:00
Thomas Kolb 7d5b67a257 Add layer 1 software loopback test 2023-05-12 13:46:02 +02:00
Thomas Kolb 513a399ae4 Refactoring: moved layer1-related stuff to subdirectory 2022-02-13 20:05:47 +01:00