Code position modulation system and method for multiple user sat

Details Code position modulation system and method for multiple user sat Code position modulation system and method for multiple user sat

1994-01-10

1995-09-12

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

375205, 455 501, 455 383, H04J 1302

Patent

active

054503957

ABSTRACT:
An embodiment of the present invention is a communications system for multiple users sharing the same maximal length code (MLC) in a code position modulation multiple access environment. A 1023 chip length code is transmitted with reference to an independent coordinated time source. The code repeats every time after 1023 chips have been transmitted. The MLC will begin each time period with the first through 1023.sup.rd chip, depending on the data to be sent and the identity of the user transmitting it. The chips belonging to the MLC that were not sent at the beginning of a time period are sent at the end to complete the MLC each time period in a wrap around fashion. Each time period can be arbitrarily divided into subsections embracing, for example, sixteen chip times. When so divided, more than sixty subsections are possible from one 1023 chip MLC. Respective users are each assigned a subsection. If the transmitted MLC begins on one of the sixteen chip time slots in a particular user's assigned subsection, the chip time slot that the MLC does begin on will be interpreted as communicating four bits of data, 0000 . . . 1111.

REFERENCES:
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patent: 5101501 (1992-03-01), Gilhousen et al.
patent: 5235615 (1993-08-01), Omuir
patent: 5267262 (1993-11-01), Wheatley
patent: 5280472 (1994-01-01), Gilhousen et al.
Scott Miller, "An Efficient Channel Coding Scheme for Direct Sequence CDMA Systems," IEEE MILCOM '91, pp. 52.6.1 to 52.6.5.

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