Send the following on WhatsApp
Continue to ChatUpper bounds on the free distance for trellis codes combined with CPFSK signals - https://avesis.uludag.edu.tr/publication/details/d5e8fd5b-3b2d-44c6-be65-4167b580741d/upper-bounds-on-the-free-distance-for-trellis-codes-combined-with-cpfsk-signals