• Manolis Surligas's avatar
    Complete redesign of the BPSK decoder · 1bc575cc
    Manolis Surligas authored
    This commit implements a new approach for the BPSK AX.25 decoding. It
    seems that the GNU Radio equalizers (both CMA and LMS) are not ideal for
    bursty transmissions. After they loose 'lock', they tend to converge
    quite slow again.
    The equalizing problem is again solved using an AGC2 block. However, the
    placement of this block is quite critical. In older versions the AGC was
    placed several steps after resampling and filtering. This resulted to
    poor equalization and noise increase. Now the AGC is placed as early as
    possible when the signal has a large span.
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