Matches 1 - 46 out of 46
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EP1275214B1 DECODING SYSTEM AND METHOD FOR DIGITAL COMMUNICATIONS  
Abstract not available for EP1275214 Abstract of corresponding document: WO0173999 A Viterbi decoding system interprets bits in received QAM constellations as many-valued parameters rather than...
6895541 Method and device for quantizing the input to soft decoders  
A receiver including a signal reception unit, for receiving a signal from a dynamically fading channel, a demodulator, connected to the signal reception unit, for demodulating the received signal,...
6810092 Method and circuitry for demodulating a digital frequency modulated signal  
A method and a circuitry for demodulating a digital frequency-modulated signal. After demodulating the digital frequency-modulated signal for generating the signal's amplitude and differential...
6507619 Decoding system and method for digital communications  
A Viterbi decoding system interprets bits in received QAM constellations as many-valued parameters rather than binary valued parameters. It performs the Viterbi algorithm using these many-valued...
6047035 Method and device for quantizing the input to soft decoders  
A receiver including a signal reception unit, for receiving a signal from a dynamically fading channel, a demodulator, connected to the signal reception unit, for demodulating the received signal,...
5887028 Digital receiver  
A digital receiver has a receiving section for receiving a digital modulated signal, a digital demodulation section for judging a logical state of a detection output signal obtained by performing a...
EP0899922A2 Rubust receiver for FSK signals  
The receiver comprises an input circuit (5, 6, 7, 8, 9), a frequency detector (30, 30') detecting a current frequency, and a processing circuit (60), whereby the current frequency of the received...
5864762 Operating a trunked communication system in transmission and message trunked modes  
A digitally trunked radio repeater system provides substantial improvements in timeliness and reliability. The mobile radio transceivers transmit channel requests on the control channel at 9600...
EP0507444B1 Data transmission apparatus with error computer and maximal likelihood calculator  
Abstract of EP0507444 A data transmission apparatus with an improved error-rate characteristic after soft decision decoding by improving a decoder input such that, according to an embodiment,...
EP0495006B1 SOFT DECISION DECODING WITH CHANNEL EQUALIZATION  
Abstract not available for EP0495006
5574788 Trunked radio repeater system  
A digitally trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses...
5553099 FSK detector for determining an increasing time period between adjacent pulses of an FSK modulated square wave pulse train  
An FSK detector circuit and method which may be utilized for the demodulation of a digital data signal from a modulated sine wave carrier signal. A simple, low parts count FSK detector is disclosed...
5539780 Computationally efficient data decoder and method used therein  
A computationally efficient data decoder that includes a measurement function (18) for providing a channel quality indication, an index function (35) for selecting, responsive to the channel...
5533055 Carrier to interference ratio measurement  
An apparatus for measuring carrier to interference ratio for a digital signal receives (101) a digital signal. The digital signal is sampled (113), producing a sampled digital signal. Variations of...
EP0506750B1 DATA ERROR DETECTION IN DATA COMMUNICATIONS  
Abstract not available for EP0506750 Abstract of corresponding document: WO9110303 A system for detection of errors in received data is described. The system can also provide for the correction of...
5471507 Circuit for detecting object signal from input signal  
An input analog signal having a periodicity is converted into one-bit digital signals by an A/D converter (42), and the one-bit digital signals are converted into parallel signals by a...
EP0679000A1 Soft quantisation.  
A hardware-efficient data receiver is proposed. In the receiver digital baseband signal samples relate to the bits in the transmission signal. For each sample a metric calculator calculates an...
5425037 Data transmission apparatus  
A data transmission apparatus with an improved error-rate characteristic after soft decision decoding by improving a decoder input such that, according to an embodiment, digital data such as voice...
5408680 Single channel autonomous digitally trunked RF communications system  
A single channel autonomous trunking ("SCAT") RF repeater transmits and receives on a single duplex RF channel. The repeater operates alternately in a control channel mode and in an assigned...
5369783 Dynamic regrouping in a trunked radio communications systems  
In a trunked radio frequency communications system, a dynamic regrouping scheme includes an effective user interface, automatic support of multi-site systems, the capability to program individual...
5289391 Method and apparatus for optimum signal burst detection  
The present invention provides a time efficient and practical method for signal burst detection. The signal is first applied to a set of linear transformations and input to a one-bit analog to...
5274838 Fail-soft architecture for public trunking system  
A site architecture for a trunked radio frequency communications system provides better fault tolerance capabilities than are available from architectures including redundant hardware. During...
5265093 Hardware interface and protocol for a mobile radio transceiver  
A system and method for communicating control signals between a digital mobile transceiver, a digital control head, and a mobile data terminal over a common serial peripheral bus uses a message...
5260974 Adaptive carrier detection  
An improvement in an apparatus which uses a carrier detection threshold level for detecting a carrier signal modulated with binary data. The threshold level is dynamically changed and generally...
5206863 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
5175866 Fail-soft architecture for public trunking system  
A site architecture for a trunked radio frequency communications system provides better fault tolerance capabilities than are available from architectures including redundant hardware. During...
EP0507444A2 Data transmission apparatus with error computer and maximal likelihood calculator.  
A data transmission apparatus with an improved error-rate characteristic after soft decision decoding by improving a decoder input such that, according to an embodiment, digital data such as voice...
EP0506750A1 DATA ERROR DETECTION IN DATA COMMUNICATIONS.  
Abstract not available for EP0506750 Abstract of corresponding document: WO9110303 A system for detection of errors in received data is described. The system can also provide for the correction of...
EP0495006A1 SOFT DECISION DECODING WITH CHANNEL EQUALIZATION.  
Abstract not available for EP0495006
5128930 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
5125102 Trunked radio repeater system including synchronization of a control channel and working channels  
A digitally trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses...
5117501 Dynamic regrouping in a trunked radio communications system  
In a trunked radio frequency communications system, a dynamic regrouping scheme includes an effective user interface, automatic support of multi-site systems, the capability to program individual...
5109543 Hardware interface and protocol for a mobile radio transceiver  
A system and method for communicating control signals between a digital mobile transceiver, a digital control head, and a mobile data terminal over a common serial peripheral bus uses a message...
5086506 Radio trunking fault detection system with power output monitoring and on-air monitoring  
A trunked radio frequency (RF) repeater system for public service trunking (PST) or the like includes a fault detection system having an RF output power monitoring, over-the-air RF monitoring and...
5077828 RF channel expansion in a trunked radio communications system  
In a trunked radio frequency communications system, an arrangement dynamically "expands" or extends the frequency allocation table stored within the "personality" defining non-volatile storage...
4968985 Data demodulation system  
A data demodulator assigns a binary value to the signal recorded in a transition cell based on the amplitude of the signal in the transition cell, the amplitudes of the signal in adjacent...
4939746 Trunked radio repeater system  
A digital trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses a...
4926496 Method and apparatus for infrequent radio users to simply obtain emergency assistance  
A digital mobile radio transceiver allows even the most unsophisticated user to simply and easily obtain emergency communications. The transceiver is programmed with "personality" data specifying...
4905302 Trunked radio repeater system  
A digitally trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses...
4905234 Apparatus and method for transmitting digital data over a radio communications channel  
A digital radio RF signalling protocol communicates either digitized voice or digital data signals and indicates the type of information being communicated to the receiver. Multiple repeats of...
4903262 Hardware interface and protocol for a mobile radio transceiver  
A system and method for communicating control signals between a digital mobile transceiver, a digital control head, and a mobile data terminal over a common serial peripheral bus uses a message...
4835731 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
4821292 Adaptive limiter/detector which changes time constant upon detection of dotting pattern  
A limiter/detector which takes advantage of the characteristics of the dotting pattern preceding each message in the General Electric Public Service Trunking System shortens bit synchronization...
4660199 Majority logic circuit for digital error correction system  
According to this invention, there are provided a plurality of memories in which predetermined data are written and a plurality of gates. Parity check bits are grouped into a plurality of groups in...
4630066 Signal quantizer  
A signal quantizer is disclosed which compares an input signal with a plurality of predetermined adjustable thresholds, associates with each threshold a potential output signal of predetermined...
4396938 Controlled ram signal processor  
A digital signal processor uses a RAM for signal processing. This allows the transfer function to be easily changed by either hardwired circuitry or a microprocessor. Two RAMs per channel can be...
Matches 1 - 46 out of 46