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Constrained sequence codes are widely used to meet constraints imposed by digital communication systems. This study presents methods to evaluate the capacity of constrained codes that have multiple independently or dependently constrained signalling dimensions. The authors outline a straightforward analysis technique when the signalling dimensions are independent, and demonstrate how the capacity...
The use of spectral shaping constrained codes is commonplace in baseband digital communication systems. In this study, the authors consider the use of constrained codes in bandpass systems through the design of DC-free codes for the complex baseband representations of commonly used signalling constellations including quaternary phase shift keying, eight-phase shift keying and sixteen quadrature amplitude...
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