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596<br />

Wire and Wireless Communication Applications Chap. 8<br />

12.5 MHz<br />

4.2 MHz<br />

4.2 MHz<br />

4.2 MHz<br />

TDM/QPSK<br />

Satellite #1<br />

TDM/OFDM<br />

Terrestrial<br />

Repeater<br />

TDM/QPSK<br />

Satellite #2<br />

2,320.0<br />

2,324.0<br />

2,328.5<br />

2,332.5<br />

2,322.0<br />

2,326.3<br />

2,330.5<br />

Frequency (MHz)<br />

(a) Sirius radio system<br />

12.5 MHz<br />

1.84 MHz<br />

1.84 MHz 2.53 MHz 2.53 MHz 1.84 MHz 1.84 MHz<br />

TDM<br />

TDM<br />

OFDM<br />

OFDM<br />

TDM<br />

QPSK<br />

A data<br />

Satellite 1<br />

TDM<br />

QPSK<br />

A data<br />

Satellite 2<br />

A data<br />

Terrestrial<br />

Repeater<br />

B data<br />

Terrestrial<br />

Repeater<br />

TDM<br />

QPSK<br />

B data<br />

Satellite 1<br />

TDM<br />

QPSK<br />

B data<br />

Satellite 2<br />

2,332.5<br />

2,334.5 2,336.5 2,338.7 2,341.0 2,343.0 2,345.0<br />

2,333.5 2,335.5 2,337.6 2,339.9 2,342.0 2,344.0<br />

(b) XM radio system<br />

Figure 8–15<br />

Frequency (MHz)<br />

Spectral allocations for U.S. digital-audio satellite systems.

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