________, the train started.
A: The signal given
B: After the signal was given
C: Given the signal
D: A and B
A: The signal given
B: After the signal was given
C: Given the signal
D: A and B
举一反三
- _____, the train started. A: The signal given B: Giving the signal C: The signal being given D: The signal giving
- A ________may be given ____means of flags, lights, and guns. A: sign; by B: signal; in C: signal; by D: sign; in
- For a given signal constellation, the average probability of symbol error incurred in maximum likelihood signal detection over an AWGN channel is invariant to the _________________ of the signal constellation. A: compression B: translation C: expansion D: rotation
- Given the waveform of a signal below, the signal can be represented by ( )[img=447x268]180337892037599.png[/img] A: [img=99x39]180337892a0bca3.png[/img] B: [img=130x39]1803378932b78f3.png[/img] C: [img=130x39]18033789411cf20.png[/img] D: [img=161x39]180337894e2e7ba.png[/img]
- Given the spectrum [img=21x22]18033774ad81d04.png[/img] of a continuous-time signal is shown below, then, the periodic signal signal [img=50x25]18033774b570388.png[/img][img=295x129]18033774bfda33c.png[/img] A: [img=142x20]18033774c806bc3.png[/img] B: [img=133x20]18033774d008a32.png[/img] C: [img=199x25]18033774d8e0526.png[/img] D: [img=138x21]18033774e1e1bd2.png[/img]