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Spectral Shaping Codes
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DOI：10.1109/TCE.2021.3073199.png)
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Abstract
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We investigate a new approach for designing spectral shaping block codes with a target spectrum, H-t(f), that has been specified at a plurality of frequencies. We analyze the probability density function of the spectral power density function of uncoded n-symbol bipolar codewords. We present estimates of the redundancy and the spectrum of spectral shaping codes with specified target spectral densities H-t(f(i)) at frequencies f(i). Constructions of low-redundancy codes with suppressed low-frequency content are presented that compare favorably with conventional dc-balanced codes currently used in data transmission and data storage devices with applications in consumer electronics.
Keywords:
Spectral shaping block codes
spectral power density function
dc-free codes
spectral notch codes
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