[gabesk]

As I understand it (and I'm not an expert just curious reader), it's part of what ATSC 3 is fixing by moving to OFDM instead of 8-VSB. Multipath in OFDM leads to some (hopefully few) number of subcarriers fading out, which error correction can manage. Conversely, 8-VSB is a regular single carrier (ish) (with 8 different analog signal levels, hence the name), so in order to decide the value of any bits at all the TV needs to identify and delay (line up) many of the ghosts up with the main signal. That's a more challenging signal processing task, especially given the diversity in age of the TV tuners (the ones from the late 2000's didn't have as advanced DSPs).