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Methods For Increased Channel Capacity Beyond Cdma

技术优势: Lower Interference Between SubscribersIncreased Battery LifeDoubled Channel CapacityEnhanced Security

*Abstract: CDMA (Code-Division Multiple Access) was introduced in 1989 as an attractive method to increase the capacity per Hz of spectrum over TDMA (Time-Domain Multiple Access). Increased capacity per communication channel results in a greater number of users able to share the same bandwidth. This in turn enables communications service providers to handle more subscribers with the same bandwidth.

Researchers at the University of California at Berkeley have advanced the CDMA technology to further increase channel capacity by a factor of 2. By applying non-linear digital signals to the carrier, the transmitted energy is spread more evenly and more densely over the bandwidth.

*Principal Investigation: Name: LEON O. CHUA
Department:

Name: TAO YANG
Department:

附加资料: Patent Number: US6331974B1
Application Number: US1998103044A
Inventor: Yang, Tao | Chua, Leon O.
Priority Date: 23 Jun 1997
Priority Number: US6331974B1
Application Date: 23 Jun 1998
Publication Date: 18 Dec 2001
IPC Current: H04B0001707 | H04J001300 | H04L000502 | H04L002700
US Class: 370342 | 370441 | 375140 | 375E01002
Assignee Applicant: The Regents of the University of California
Title: Chaotic digital code-division multiple access (CDMA) communication systems
Usefulness: Chaotic digital code-division multiple access (CDMA) communication systems
Summary: USE For going some way to providing a better service for mobile subscribers at a lower price.
Novelty: Method for modulating code division multiple access device receiving data for transmission from device allows mobile stations to have same structure and parameters, assigns only initial conditions to different mobiles, instead of synchronising 2 binary ps

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