Question
This quantity for a modulated signal differs by a fixed amount for the two streams in I/Q data, which is derived from the narrowband assumption. For 10 points each:
[10h] Name this quantity whose “keying” is plotted on “constellation diagrams” in digital modulation. This quantity names a class of time-invariant vectors that are generalized by analytic signal representations.
ANSWER: phase [accept phasors or phase-shift keying] (The I/Q data of a signal is its decomposition into in-phase and quadrature components.)
[10e] Phasors are representations of functions with this shape, since they encode the amplitude and phase of a signal. Functions with this shape are the usual terms in a Fourier series.
ANSWER: sinusoidal [accept sine or cosine; prompt on periodic]
[10m] In circuit analysis, the ratio of two phasors corresponds to this complex quantity. A generalization of Ohm’s law for inductors and capacitors in AC circuits states that voltage equals current times this quantity.
ANSWER: impedance [prompt on Z]
<CWRU A, Physics>
Summary
| California | 2025-02-01 | Y | 3 | 16.67 | 100% | 67% | 0% |
| Florida | 2025-02-01 | Y | 3 | 6.67 | 67% | 0% | 0% |
| Lower Mid-Atlantic | 2025-02-01 | Y | 6 | 13.33 | 83% | 17% | 33% |
| Midwest | 2025-02-01 | Y | 6 | 20.00 | 100% | 50% | 50% |
| North | 2025-02-01 | Y | 3 | 10.00 | 67% | 33% | 0% |
| Northeast | 2025-02-01 | Y | 5 | 12.00 | 80% | 40% | 0% |
| Pacific Northwest | 2025-02-01 | Y | 2 | 10.00 | 50% | 50% | 0% |
| South Central | 2025-02-01 | Y | 2 | 20.00 | 100% | 100% | 0% |
| Southeast | 2025-02-01 | Y | 4 | 2.50 | 0% | 25% | 0% |
| UK | 2025-02-01 | Y | 10 | 19.00 | 100% | 70% | 20% |
| Upper Mid-Atlantic | 2025-02-01 | Y | 8 | 15.00 | 88% | 38% | 25% |
| Upstate NY | 2025-02-01 | Y | 3 | 3.33 | 33% | 0% | 0% |
Data
| Maryland A | Columbia B | 0 | 0 | 10 | 10 |
| Haverford A | Cornell B | 0 | 10 | 0 | 10 |
| Vassar A | George Washington A | 0 | 10 | 0 | 10 |
| Maryland B | George Washington B | 0 | 10 | 0 | 10 |
| John Jay College | Haverford B | 0 | 10 | 0 | 10 |
| NYU B | Johns Hopkins A | 0 | 10 | 0 | 10 |
| Penn A | Penn B | 10 | 10 | 10 | 30 |
| Rutgers A | Yale A | 10 | 10 | 10 | 30 |