Nonlinear techniques for the improvement of signal-to-noise ratio
Abstract
A novel circuit for noise rejection is proposed which is composed mainly of a linear amplifier, a nonlinear amplifier, and a filter. The input signal is applied to a linear amplifier, a bandpass limiter, and an envelope detector followed by a low-pass filter. The output of the low-pass filter is multiplied by the output of the bandpass limiter. The difference between the output of the multiplier and linear amplifier is the output of the proposed circuit. It is then indicated that the proposed circuit rejects noise when its amplitude is narrow-band relative to the desired signal or noise phase.
- Publication:
-
IEEE Transactions on Communications
- Pub Date:
- September 1986
- Bibcode:
- 1986ITCom..34..969S
- Keywords:
-
- Amplifiers;
- Bandpass Filters;
- Limiter Circuits;
- Noise Reduction;
- Phase Modulation;
- Signal To Noise Ratios;
- Bandwidth;
- Narrowband;
- Nonlinearity;
- Oscillographs;
- Spread Spectrum Transmission;
- Communications and Radar