Hi Steve and all,
I have run a new series of tests of various WSPR decoders, with results
that may be of interest to others.
The test runs all used the same set of 386 *.wav files, processed with
the following decoders:
1. wsprd, from WSPR-X (baseline decoder)
2. wspr4
3. wsprd, as built for WSJT-X v1.6.0 r5636
4. wsprd_exp, signal subtraction using symbol-by-symbol coherence
5. wsprd_exp, subtraction with full coherence and test for local maxima
6. wsprd_exp, subtraction with full coherence and snr > min_snr
For each run the following table gives the number of decodes, the
wall-clock running time, the average time per wav file, and the
"improvement factor" for number of decodes and speed.
Decodes Time1 AvgTime Improvement Decoder
(s) (s) Decodes Speed
----------------------------------------------------------------
1. 1451 2111 5.5 1.00 1.00 baseline
2. 1693 1599 4.1 1.17 1.32 wspr4
3. 2208 335 0.9 1.52 6.30 WSJT-X v1.6.0 r5636
4. 2464 413 1.1 1.70 5.11 partial coherence
5. 2567 431 1.1 1.77 4.90 full coherence
6. 2839 2136 5.5 1.96 0.99 more candidates
I think these results show some truly remarkable improvements in
performance!
Our slowest decoder, that used for run #6, is essentially the same speed
as the original decoder packaged with WSPR-X -- yet it produces twice as
many decodes! Although it's arguably "fast enough" already, I am
confident that we can make it faster. Run #5, which used the two-pass
decoder with full-coherence subtraction of decoded signals, is
impressive with respect to *both* speed and thoroughness.
-- Joe, K1JT
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