The FTN modulation scheme may be employed both temporally and in frequency (e.g., the frequency spacing of the channels may be tighter than the Nyquist frequency spacing condition.
Furthermore, a temporal compression entity (120) is provided for compressing, at a frequency lower than the Nyquist frequency, the second plurality of signals into a plurality of signal data sets (122).
Subsampling means that the sigma-delta analog to digital converter has a sampling frequency which is below the Nyquist frequency of a RF carrier signal within the analog MR information signal.
The composite filter may provide a frequency response curve with a corner frequency as it approaches the Nyquist frequency whereas the frequency response of a conventional filter (shown in broken line detail) is flat with no effect.
The present invention relates to a method for detecting tones in a received signal, whereby the signal is non-uniformly sampled at a rate below the Nyquist frequency.
For a frequency-modulated continuous-wave waveform (FMCW), the receiver may be turned on for short intervals at a rate which is at least the Nyquist rate for the signal received from at target.
A signal, which includes a sequence of the pulse-shaped symbols (104A...104C) transmitted at a symbol rate that is higher than a Nyquist rate defined for the given pulse shape, is transmitted to a receiver (40).
In addition, the CS sampling circuitry is configured to generate the plurality of measurements at a rate that is less than the Nyquist rate of the analog input signal.
fN is the Nyquist or folding frequency.
fN is the Nyquist or cut-off frequency.
After summation (80), the samples are reconstructed (82) at a Nyquist or other rate.