Howtosignalprocessing
- How do you detect signals below noise floor?
- How to detect DSSS signals?
- What is the RF noise floor?
- Why does GPS use DSSS?
How do you detect signals below noise floor?
Signals that are below the noise floor can be detected by using different techniques of spread spectrum communications, where signal of a particular information bandwidth is deliberately spread in the frequency domain resulting in a signal with a wider occupied bandwidth.
How to detect DSSS signals?
In the proposed approach, firstly DSSS signals are blindly detected by leveraging the variations in autocorrelation of the received signal. Then, the presence of desired DSSS signal is confirmed when correlation peaks cross the threshold at multiple positions after a fixed period.
What is the RF noise floor?
Noise floor is the noise level below which signals cannot be detected under the same measurement conditions. Noise floor is the measure of the noise density (dBm/Hz), or the noise power, in a signal of 1 Hz bandwidth.
Why does GPS use DSSS?
Satellite signals
GPS satellite transmissions utilize direct sequence spread spectrum (DSSS) modulation. DSSS provides the structure for the transmission of ranging signal and essential navigation data such as satellite co-ordinates and health.
