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Continue to ChatUpper bounds on the free distance for a class of convolutional coded CPFSK signals - https://avesis.uludag.edu.tr/publication/details/2fe7bb55-3f21-421a-b06d-1915070d7d4e/upper-bounds-on-the-free-distance-for-a-class-of-convolutional-coded-cpfsk-signals