Pulse or digital communications – Repeaters – Testing
Patent
1994-04-04
1996-03-05
Cain, David C.
Pulse or digital communications
Repeaters
Testing
375200, 380 34, 370 18, 370 19, H04K 110
Patent
active
054973953
ABSTRACT:
An improved system and method for transmitting information within a digital communication system is disclosed herein. A modulation system for use in a digital cellular communication system is described in which information is exchanged among a plurality of mobile users, via at least one cell-site, using a set of orthogonal binary codes. The modulation system allows the information carrying capacity of signal transmission on the mobile-to-cell communication link, i.e., the "reverse" link, of the communication system to be significantly improved. The modulation system receives an input information signal an generates an orthogonal sequence signal in response thereto. The orthogonal sequence signal corresponds to a selected one of a plurality of orthogonal binary chip sequences derived from a set of orthogonal binary codes. The orthogonal binary sequences are constructed such that a selected chip at a predefined sequence position within each of the orthogonal binary sequences is of the same binary value. The selected orthogonal sequence signal is combined with a control signal to provide a punctured sequence signal. This combination is performed such that the punctured sequence signal includes a control chip at the predefined sequence position having a value determined by the control signal. The punctured sequence signal may then be transmitted via a carrier signal. In a particular spread spectrum implementation, the punctured sequence signal is combined with a pseudo-noise (PN) signal in order to generate a carrier modulation signal.
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Cain David C.
Edmonston Brian S.
Miller Russell B.
Qualcomm Incorporated
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