Rapid synchronization for communication systems

Details Rapid synchronization for communication systems Rapid synchronization for communication systems

1996-10-23

1998-10-06

Pham, Chi H.

Multiplex communications

Communication over free space

Combining or distributing information via time channels

375344, 455 62, 455 71, H04L 2706

Patent

active

058188320

ABSTRACT:
A local multipoint data distribution system (10) simultaneously accommodates many communication sessions occurring at a variety of data rates. Space surrounding cell sites (12) is partitioned into sectors (16), and the spectrum is allocated so that adjacent sectors (16) use different spectrum portions, but the entire spectrum is reused numerous times. A time diversity scheme allocates different numbers of time slots (54) to different calls. Time slot identifiers are assigned in contiguous blocks in an assigned numbering system (56). The time slot identifier assignments are translated into a counted numbering system (58) which causes the time slots (54) for any call to be distributed throughout a frame (48) and interleaved with time slots (54) assigned to other calls. Data communications use a common modulation format and a modulation order that is specifically adapted to a particular call. A spectral coherence technique causes reverse channel signal (158) to be transmitted at a frequency to which a base station demodulator (170) is already synchronized.

REFERENCES:
patent: 5115515 (1992-05-01), Yamamoto et al.
patent: 5241688 (1993-08-01), Arora
patent: 5377232 (1994-12-01), Davidov et al.
patent: 5390216 (1995-02-01), Bilitza et al.
patent: 5509034 (1996-04-01), Beukema

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