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Upper Bounds on the Free Distance for Trellis Codes Combined with CPFSK Signals
journal contributionposted on 2023-06-08, 05:12 authored by T Ertas, Falah AliFalah Ali
It is well-known that CPM schemes themselves exhibit attractive spectral efficiencies and that combining them with a rate m/(m + 1) external trellis encoder with 2m+1-level modulation results in better power-bandwidth performance. Since the free distance is a good measure of performance, the authors construct upper bounds on the ultimately achievable free distance for trellis codes of Ungerboeck type combined with constant-envelope CPFSK signals. Some encoders achieving the constructed upper bounds are also presented.
PublisherIEE Electronics Letters
Department affiliated with
- Engineering and Design Publications
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