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Injection Coding With Spectral Shaping Capability
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DOI：10.1109/ACCESS.2020.3049017.png)
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Abstract
En 中文
In digital transmission systems that involve pulse amplitude modulation (PAM), channel coding is useful for spectral shaping by concentrating the frequency energy of the transmitted information towards a predetermined range of the frequency spectrum, or making it have low power content at such frequencies, so as to suit the frequency characteristics of the communication channel. We thus present a permutation coding system with injections that can exhibit spectral shaping at rational sub-multiples of the symbol frequency. We also present a mathematical expression that allows for the prediction of low energy positions in the codebook's spectrum. Upper and lower bounds for the low energy spectrum were also determined. Due to the way the injections are introduced, it gives the scheme an advantage of achieving higher symbol rate, when compared with conventional permutation coding systems.
Keywords:
Encoding
Frequency modulation
Upper bound
Licenses
Frequency division multiplexing
Couplings
Complexity theory
Frequency spectrum
injection
PAM
permutation codes
power spectral density
pulse amplitude modulation
spectral shaping
spectrum nulls
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