About noiseimmunity of signal-code structures for internet of things
DOI:
https://doi.org/10.52575/2687-0932-2021-48-4-822-830Keywords:
IoT systems, spread spectrum, chirp, orthogonal subband basis, signal-to-noise ratio, error probability, fluctuation noiseAbstract
The article about a method for coding signal-code structures based on an orthogonal sub-band basis with high resistance from fluctuation noise in IoT systems. Shown results of comparative computational experiments of bit error rate on the spread spectrum transmission method in LoRa system and the method based on the eigenvectors of the subband basis. Another solution is use index of subband matrix for coding bit information, this is like time shift of Chirp Spread Spectrum (CSS) base signal. If transmit bits on each eigenvector it is improve throughput of the system and decrease of noise immunity and bit error rate same as binary phase shift key (BPSK) modulation. But it gives more opportunities for adaptive speed correction for current level of Additive white Gaussian noise (AWGN) channel. The article contains results of numerical experiments of spreading factor in AWGN channel against of signal to noise ratio (SNR). Coding by indexing eigenvectors have small complexity and can be build only on memory use.
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