Pulse or digital communications – Spread spectrum
Reexamination Certificate
1996-12-12
2001-07-10
Vo, Don N. (Department: 2631)
Pulse or digital communications
Spread spectrum
C375S148000
Reexamination Certificate
active
06259720
ABSTRACT:
FIELD OF THE INVENTION
This invention relates in general to digital signal processors and more particularly to a software configurable digital signal processing system for radio frequency applications.
BACKGROUND OF THE INVENTION
General digital signal processing devices have been available since the early 1980's. However, due to technology limitations, e.g., device characteristics and topology constraints, the utility of this group of devices has been limited to the processing of relatively low frequency signals. With the explosion of wireless communications, there is a great need for a general purpose device that can suitably process signals for transmission and reception. Because of the lack of spectrum available to carry modern signaling schemes, developers are turning to schemes such as spread spectrum modulation or the like, which require extremely high performance signal processors. One solution has been to design and fabricate either discrete solutions or attempt a costly custom integrated circuit that handles the signal processing chores. Although these alternatives may fill a short term need and allow a manufacturer to place a product in the market, the long and tedious design cycles associated with such implementations may cause delays that prevent a manufacturer from grasping an opportunity during the most preferable time frame, thus establishing themselves as a pioneer and standard setter in the field.
Consequently, an architecture is needed that allows a designer and manufacturer to quickly implement demanding digital signal processing solutions in a flexible manner that allows multiple iterations without the extended product cycle time associated with discrete or custom integrated circuit products.
SUMMARY OF THE INVENTION
Briefly, according to the invention, there is provided a programmable versatile digital signal processing system architecture allows the implementation of functions for transmitting and receiving a variety of narrow and wide-band communication signaling schemes. The flexibility of the architecture makes it possible to receive and transmit many different spectral communication signals in real time by implementing signal processing functions such as filtering, spreading, de-spreading, rake filtering, and equalization under the direction of program instructions.
REFERENCES:
patent: 4701934 (1987-10-01), Jasper
patent: 4785463 (1988-11-01), Janc et al.
patent: 5483549 (1996-01-01), Weinberg et al.
Gray Chip, DSP Chips & Systems, “GC1011A Digital Receiver Chip” Nov. 24, 1992 pp. 1-28.
Gray Chip, DSP Chips & Systems, “GC1012 Digital Tuner Chip” Feb. 14, 1996 pp. 1-29.
Gray Chip, DSP Chips & Systems, “GC4014 Quad Receiver Chip” Oct. 31, 1996, pp. 1-32.
Gray Chip, DSP Chips & Systems, “GC4114 Transmit Chip” Jun. 25, 1996 pp. 1-30.
Buss John Michael
Dworkin James Douglas
Smith Stephen Lee
Dulaney Randi L.
Motorola Inc.
Vo Don N.
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