Unipolar encoding
This article needs additional citations for verification. (March 2022) |
Unipolar encoding is a
Its drawbacks are that it is not
NRZ (Non-Return-to-Zero) - Traditionally, a unipolar scheme was designed as a non-return-to-zero (NRZ) scheme, in which the positive voltage defines bit 1 and the zero voltage defines bit 0. It is called NRZ because the signal does not return to zero at the middle of the bit, as instead happens in other line coding schemes, such as Manchester code. Compared with its polar counterpart, polar NRZ, this scheme applies a DC bias to the line and unnecessarily wastes power – The normalized power (power required to send 1 bit per unit line resistance) is double that for polar NRZ. For this reason, unipolar encoding is not normally used in data communications today.
An Optical Orthogonal Code (OOC) is a family of (0,l) sequences with good
See also
- Bipolar encoding
- Bipolar violation
- On-off keying
References
- )
- doi:10.1109/18.30982.
- ISSN 0090-6778.