The arguments in the preceding paragraph relating small changes in ν(C≡O) to conformational variation among complexes of the same ligand set have a converse, namely, that invariant frequencies are indicators of highly similar coordination and conformation.
Since the Fourier sinusoid has time-invariant frequency, the S-transform is consequently unsuitable for resolving waveforms whose frequency changes with time.
Considering the time-invariant frequency component, concentrated distribution of the tremor source, and time-invariant amplitude ratios, the scaling bound on the amplitude of the tremor suggests a fixed-source geometry with variable forces that drive the tremor.
We consider OFDM transmission over a time-invariant frequency-selective channel.
Figure 13 SER analysis over time-invariant frequency-selective channel for a GFDM data block appended to the preamble.
For SC transmissions over time-invariant frequency-selective channels, time-domain turbo equalization (see [6, 7]) is traditionally more popular than frequency-domain turbo equalization [10].
In other words, while both [18, 21] consider a block-invariant frequency-flat channel, we consider a frequency-selective channel that is correlated over successive symbol blocks.
In the last fifteen years, many turbo equalizers have been proposed for time-invariant frequency-selective channels (see [6 11], and the references therein).
Coded multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) has been intensively explored for broadband communications over multipath-rich, time-invariant frequency-selective channels [1].
Note that, since most of the next generation wireless network standards require transmission in high speed environments, time-variant frequency-selective multipath assumption should be considered rather than time-invariant frequency-selective multipath assumption.
