Telecommunications – Transmitter and receiver at same station – With a common signal processing stage
Reexamination Certificate
1998-11-03
2002-01-29
Urban, Edward F. (Department: 2683)
Telecommunications
Transmitter and receiver at same station
With a common signal processing stage
C455S084000, C455S552100
Reexamination Certificate
active
06343207
ABSTRACT:
BACKGROUND OF THE INVENTION
This application relates to a field programmable radio frequency communications systems and more particularly to field programmable digital intermediate frequency (IF) demodulator and modulator circuits and signal processing circuits therefor.
Descriptions of the various components of the system are contained in co-pending patent applications owned by the assignee hereof and filed concurrently herewith, specifically: U.S. patent application Ser. No. 09/184,714, entitled “Reconfigurable Radio System Architecture And Method Therefor now U.S. Pat. No. 6,091,765”; U.S. patent application Ser. No. 09/184,716, entitled “A Control System For Controlling the Processing Data of a First In First Out Memory and Method Therefor”; U.S. patent application Ser. No. 09/184,940, entitled “Configurable Circuits for Field Programmable Radio Frequency Communications Equipment and Methods Therefor”; U.S. patent application Ser. No. 09/184,710, entitled “A System For Accelerating the Reconfiguration of a Transceiver and Method Therefor”; U.S. patent application Ser. No. 09/184,711, entitled “A Field Programmable Modulator-Demodulator Arrangement For Radio Frequency Communications Equipment, And Method Therefor”; U.S. patent application Ser. No. 09/184,708, entitled “A Digital Noise Blanker For Communications Systems And Methods Therefor, now U.S. Pat. No. 6,292,654“; U.S. patent application Ser. No. 09/184,712, entitled “TCM Revisiting System and Method”; U.S. patent application Ser. No. 09/184,941, entitled “Least Squares Phase Fit As Frequency Estimate”; U.S. patent application Ser. No. 09/184,715, entitled “Polar Computation of Branch Metrics For TCM”; U.S. patent application Ser. No. 09/184,746, entitled “Efficient Modified Viterbi Decoder”, now U.S. Pat. No. 6,289,487; U.S. patent application Ser. No. 09/184,713, entitled “Receiver For a Reconfigurable Radio System and Method Therefore”; each of which is incorporated herein by reference.
In the use of radio frequency equipment for communications, there is a need for a large a variety of types communication devices, such as receivers, transmitters and transceivers that are able to operate with a large variety of communications schemes, or waveforms such as, AM, AME, A3E, H3E, J3E, CW, SSB, M-PSK, QAM, ASK, angular modulation, including FM, PM, FSK, CMP, MSK, CPFSK etc., as well a need of being able to process the signals within the communications devices, such as by filtering, gain control, impulse noise rejection, etc. To acheive this in the past, a plurality of different dedicated pieces of equipment was required, such as, receivers, transmitters and transceivers, each designed to operate with separate communication schemes or waveforms, or a limited group of schemes or waveforms. Hence it would be desirous to have a configurable type of radio frequency communications equipment that is readily field programmable to function as a transmitter and receiver and to be able to be programmed to function with any of the above mentioned communications schemes or waveforms.
An important building block for a configurable type transceiver is a configurable digital intermediate frequency (IF) transmitter and receiver signal processing circuit that can be field programmed to provide the receiver demodulation functions and transmitter modulator functions and also corresponding waveform filtering and shaping. Hence, it would be desirous to have a digital IF demodulator and modulator circuits that is field programmable to operate with a large variety types of communications schemes, or waveforms such as, AM, AME, A3E, H3E, J3E, CW, SSB, M-PSK, QAM, ASK, angular modulation, including FM, PM, FSK, CMP, MSK, CPFSK etc. Further, there are times when multiple types of outputs are desirous from such circuits, such as cartesian and polar, for the same signal scheme or waveform. Hence, it would be desirous if a field programmable digital baseband signal processing circuit would be provided that would programmable to function with a variety of signaling schemes or waveforms and that could provide multiple outputs for signaling schemes.
In the addition, quite often there is a need for portable battery operated radio frequency communication equipment. Hence it is desirous with battery operated type of equipment to make the equipment as small and as light as practical for ease of handling, and to reduce the power drain on the equipment battery to extend the portable life of the equipment.
Is therefor an object of this invention to provide a new and improved field programmable digital IF signal processing system for radio frequency communications equipment that can be readily configured by the user in the field as functioning as either a receiver or transmitter signal processing circuit.
Is also an object of this invention to provide a new and improved field programmable digital IF signal processing system for radio frequency communications equipment that can be readily configured by the user in the field to operate with any of a plurality of communications schemes or waveforms.
Is also an object of this invention to provide a new and improved field programmable digital IF signal processing system for radio frequency communications equipment that can be readily configured by the user in the field to operate in any of a plurality of communications schemes or waveforms and configured to provide filtering and wave shaping parameters in accordance with the selected communications scheme or waveform.
Is also an object of this invention to provide a new and improved field programmable digital IF signal processing system for radio frequency communications equipment that can provide multiple types of signal outputs for a variety of signal schemes or waveforms.
Is also an object of this invention to provide a new and improved field programmable digital IF signal processing system for radio frequency communications equipment field that is relatively light weight for portable equipment.
Is also an object of this invention to provide a new and improved field programmable IF signal processing system for radio frequency communications equipment that is designed to use reduced battery power to extend the life of the portable mode of operation.
These and other objects and advantages of the present invention will be readily apparent to one skilled in the art to which the invention pertains form a perusal of the claims, the appended drawings, and the following detailed description of the preferred embodiments.
REFERENCES:
patent: 4525865 (1985-06-01), Mears
patent: 5144314 (1992-09-01), Malmberg et al.
patent: 5220557 (1993-06-01), Kelley
patent: 5584051 (1996-12-01), Goken
patent: 6072994 (2000-06-01), Phillips et al.
patent: 6212278 (2001-04-01), Bacon et al.
patent: 534255 (1993-03-01), None
patent: 823788 (1998-02-01), None
patent: 97/08840 (1997-03-01), None
WO97/08843, Phillips, et al., “Common Receive Module for a Programmable Digital Radio”, Mar. 6, 1997.
Gorton John E.
Hessel Clifford
Kreeger Michael E.
Mackey Christopher D.
Marks Scott E.
Carter, Ledyard & Milburn
Harris Corporation
Urban Edward F.
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