Methods For Increased Channel Capacity Beyond Cdma

Tech ID: 18509 / UC Case 1997-080-0


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.


Lower Interference Between Subscribers
Increased Battery Life
Doubled Channel Capacity
Enhanced Security

Patent Status

Country Type Number Dated Case
United States Of America Issued Patent 6,331,974 12/18/2001 1997-080


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Other Information


communications, wireless: system, wireless, optical, networking, wireless: method, wireless: component

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