Pulse or digital communications – Transceivers
Reexamination Certificate
1998-11-03
2002-04-30
Pham, Chi (Department: 2631)
Pulse or digital communications
Transceivers
C375S269000, C375S271000, C455S084000
Reexamination Certificate
active
06381265
ABSTRACT:
BACKGROUND OF THE INVENTION
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. Pat. No. 6,091,765, Issued on Jul. 18, 2000, entitled “Reconfigurable Radio System Architecture And Method Therefor”; 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. 09/184,709, entitled “A Field Programmable Radio Frequency Communications Equipment Including A Configurable IF Circuit, And Method Therefore”; U.S. patent application Ser. No. 09/184,708, entitled “A Digital Noise Blanker For Communications Systems And Methods Therefor”; 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”; 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.
This application relates to field programmable radio frequency communications systems and more particularly to a field programmable digital intermediate frequency (IF) angle modulation circuits and signal processing circuits therefor.
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, and angular modulation, such as, 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 achieve 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.
Is therefor an object of this invention to provide a new and improved configurable digital signal processing circuit arrangement that can be readily configured by the user in the field to function in plural modulator and demodulator modes of operation.
Is also an object of this invention to provide a new and improved configurable digital signal processing circuit that can be configured by the user in the field to operate as a modulator and demodulator with the use of a plurality of communications scheme or waveforms.
Is also an object of this invention to provide a new and improved configurable digital signal processing circuit for radio frequency communications equipment that can be configured by the user in the field to operate in the modulator and demodulator modes of operation with 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 therefor an object of this invention to provide a new and improved configurable modulator circuit arrangement for radio frequency communications equipment that can be configured by the user in the field.
Is also an object of this invention to provide a new and improved configurable modulator circuit for digital IF signal processing system for radio frequency communications equipment that can be 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 configurable modulator circuit for 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.
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: 5423076 (1995-06-01), Westergren et al.
patent: 5872810 (1999-02-01), Philips et al.
patent: 6016422 (2000-01-01), Bartusiak
patent: 6125148 (2000-09-01), Frodigh et al.
Hessel Clifford
Kreeger Michael E.
Duane Morris LLP
Harris Corporation
Pham Chi
Phu Phuong
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