Microwave and Wireless Communications Technology

Satellite Communications 421

I r I

"~"---.~----"~ F2

WEST }

F2 -" F1

I

' EAST >

Figure

20-14

Bidiredional relay system.

The system in Fig. 20-13 is reduced to the most primitive simplex case, which

allows transmission in only one direction. The origination station transmits on F1,

and the first relay receives F1 and translates it to F2 to avoid intrasystem interfer-

ence. Each successive relay reverses the RX/TX order, so the pattern will be F1/F2,

F2/F1, F1/F2,

and so on. The destination station receives the final signal (in this

case on frequency F1) and demodulates it to recover the information.

Half-duplex and the more common ...