... broadband video systems
16 QAM Microwave digital radio, modems, DVB-C, DVB-T
32 QAM Terrestrial microwave, DVB-T
64 QAM DVB-C, modems, broadband set top boxes, MMDS
256 QAM Modems, DVB-C (Europe), ... digital modulation family is Quadrature Amplitude
Modulation (QAM). QAM is used in applications including microwave
digital radio, DVB-C (Digital Video Broadcasting - Cable) and...
... that are used in communications systems: I/Q offset modulation,
differential modulation, and constant envelope modulation.
3.8 I/Q offset modulation
The first variation is offset modulation. One ... is constant-envelope modulation. GSM uses a variation
of constant amplitude modulation format called 0.3 GMSK (Gaussian
Minimum Shift Keying).
In constant-envelope modulation th...
... wave reception at night, using the first-hop E layer mode of propagation. Loran-A has
a typical accuracy of about 1 nmile for ground wave reception and 6 nmiles for sky wave
reception.
Loran-A ... Loran-C. The last operational Loran-A chains were based along the coast of China. The
Loran-C system evolved from Loran-A and the basic principles of both systems are the same.
x Preface
El...
... wave reception at night, using the first-hop E layer mode of propagation. Loran-A has
a typical accuracy of about 1 nmile for ground wave reception and 6 nmiles for sky wave
reception.
Loran-A ... Loran-C. The last operational Loran-A chains were based along the coast of China. The
Loran-C system evolved from Loran-A and the basic principles of both systems are the same.
x Preface
El...
... wave reception at night, using the first-hop E layer mode of propagation. Loran-A has
a typical accuracy of about 1 nmile for ground wave reception and 6 nmiles for sky wave
reception.
Loran-A ... Loran-C. The last operational Loran-A chains were based along the coast of China. The
Loran-C system evolved from Loran-A and the basic principles of both systems are the same.
x Preface
El...
... Security and
Reliability of
Electronic Voting
Systems Are Under
Way, but Key Activities
Need to Be Completed
GAO-0 5-9 56
Page 15 GAO-0 5-9 56 Electronic Voting Systems
Organizations. HAVA established ... Precinct-count optical scanner.
B. Central-count optical scanner.
C. Detail showing ballot feed for
central-count scanner.
B
C
A
Source: Equipment vendors.
Page 10 GAO-0 5-9...