Pulse or digital communications – Testing – Data rate
Reexamination Certificate
1998-11-03
2003-03-25
Pham, Chi (Department: 2631)
Pulse or digital communications
Testing
Data rate
C375S219000, C375S259000, C375S295000, C375S316000, C455S422100, C370S505000
Reexamination Certificate
active
06539052
ABSTRACT:
BACKGROUND OF THE INVENTION
This application pertains to a field reconfigurable digital transceivers in general, and more particularly to a system for accelerating the process for reconfiguring the transceiver when switching between receive and transmit modes of operation, and when switching between various communication signaling schemes or waveforms.
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. 09/184,709, entitled “A Field Programmable Radio Frequency Communications Equipment Including A Configurable IF Circuit, And Method Therefore”; U.S. patent application Ser. No. 09/184,711, 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”; 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.
In the use of radio frequency equipment for communications, there is a need for a large 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. Such configurable digital IF signal processing circuit often includes circuitry that is common to both the demodulation and modulation functions.
In order to be able to effectively use field reconfigurable transceivers in situations that require rapid switch over from the receiver and transmitter modes of operation, such a automatic request repeat systems (ARQ), or radio frequency networking. In such cases the reconfigurable transceivers need to be able to switch between modes as quickly as possible so as to minimize the system down time. In addition, when the reconfigurable transceiver has the capability to process any of a plurality of signaling schemes or waveforms, there is also a need to minimize the time required to switch between subsequently selected signaling schemes and waveforms within the receive and transmit modes of operation as well as switching between receive and transmit modes of operation.
Is therefor an object of this invention to provide a new and improved system for accelerating the process for configuring a digital IF signal processing system for radio frequency communications equipment when switching between receiver and transmitter modes of operation.
Is also an object of this invention to provide a new and improved system for accelerating the process for configuring a digital IF signal processing system for radio frequency communications equipment when switching between any of a plurality of communications schemes or waveforms.
Is also an object of this invention to provide a new and improved system for accelerating the process for configuring a digital IF signal processing system for radio frequency communications equipment by accelerating the processing of received signal prior to switching modes of operation or signaling schemes.
Is also an object of this invention to provide a new and improved system for accelerating the process for configuring a digital IF signal processing system for radio frequency communications equipment by accelerating the processing of signal to be transmitted.
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Hessel Clifford
Kreeger Michael E.
Harris Corporation
Kumar Pankaj
Morris LLP Duane
Pham Chi
LandOfFree
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