# SNR per bit aka energy per bit to noise power spectral density ratio Useful for comparing digital modulation schemes without considering bandwidth. ## General description A dimensionless ratio of energies commonly expressed in dB. ![E_{b}/N_{0}](https://wikimedia.org/api/rest_v1/media/math/render/svg/57afdd0e098fc446047074ec612378e4616d110a) directly indicates the power efficiency of the system without regard to modulation type, error correction coding or signal bandwidth (including any use of [spread spectrum](https://en.wikipedia.org/wiki/Spread_spectrum "Spread spectrum")). This also avoids any confusion as to _which_ of several definitions of "bandwidth" to apply to the signal [^1] # References [^1]: https://en.wikipedia.org/wiki/Eb/N0