Spacecraft cellular communication system with mutually offset hi

Details Spacecraft cellular communication system with mutually offset hi Spacecraft cellular communication system with mutually offset hi

1998-08-12

2000-06-06

Tarcza, Thomas H.

Telecommunications

Carrier wave repeater or relay system

Portable or mobile repeater

455 134, 455 19, 455 68, 455427, 342354, H04B 7185, H04B 714, H04B 100, H04B 700

Patent

active

060729856

ABSTRACT:
A spacecraft cellular communication system (10) includes a spacecraft (12) with an antenna (12a) which produces multiple "spot" beams (20a, 20b, . . . ) for serving user terminals (16) lying in the footprints (20af, 20bf, . . . ) of the beams. The communication system is controlled by a network control center (NCC 18), which produces forward control signals (608, 611, 613). The forward control signals include high-margin (H) portions and lower-margin (LM) portions. In order to minimize the power required to transmit the forward control signals from the spacecraft, the number of forward control signal carriers is limited to one per antenna beam. In order to minimize the peak-to-average power requirement placed on the spacecraft power source (12s, 12pc), the high-margin portions (H) of the forward control signals of the various antenna beams are mutually offset in time or time-interleaved.

REFERENCES:
patent: 5787336 (1998-07-01), Hirschfield et al.

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