System and method for multiple access short message communicatio

Details System and method for multiple access short message communicatio System and method for multiple access short message communicatio

1996-04-22

1999-01-19

Hsu, Alpus H.

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

370347, 370350, 370515, 375201, 455450, H04B 7212, H04B 7216

Patent

active

058621326

ABSTRACT:
The present invention describes a communications system that utilizes frequency division multiple access (FDMA), code division multiple access (CDMA), and time division multiple access (TDMA) techniques for providing efficient use of frequency spectrum while supporting a large number of transmitters/users (2-6). Many users of the communications system share a common frequency band, but each transmit their respective message bursts (50) at different and specific times via a TDMA technique. To facilitate synchronization of the TDMA technique, each transmitter of the system is synchronized to a common timing reference (1) thereby abating the need to maintain synchronization between the transmitters (2-6) and receivers (8-12) of the system. Each TDMA message is then transmitted via a spread spectrum technique by multiplying (82) the message burst to be transmitted by a pseudo-random sequence of ones and zeroes (84) and transmitting such spread spectrum message burst for reception by one or more receivers within the system.

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