Christopher R. Jones
Christopher R. Jones, Newport Beach, CA US
Patent application number | Description | Published |
---|---|---|
20110026423 | Robust Techniques for Upstream Communication Between Subscriber Stations and a Base Station - A number of features for enhancing the performance of a communication system, in which data is transmitted between a base station and a plurality of subscriber stations located different distances from the base station, are presented. The power transmission level, slot timing, and equalization of the subscriber stations are set by a ranging process. Data is transmitted by the subscriber stations in fragmented form. Various measures are taken to make transmission from the subscriber stations robust. The uplink data transmission is controlled to permit multiple access from the subscriber stations. | 02-03-2011 |
20130294377 | Robust Techniques for Upstream Communication Between Subscriber Stations and a Base Station - A number of features for enhancing the performance of a communication system, in which data is transmitted between a base station and a plurality of subscriber stations located different distances from the base station, are presented. The power transmission level, slot timing, and equalization of the subscriber stations are set by a ranging process. Data is transmitted by the subscriber stations in fragmented form. Various measures are taken to make transmission from the subscriber stations robust. The uplink data transmission is controlled to permit multiple access from the subscriber stations. | 11-07-2013 |
Christopher R. Jones, Pacific Palisades, CA US
Patent application number | Description | Published |
---|---|---|
20090097582 | Methodology and method and apparatus for signaling with capacity optimized constellations - Communication systems are described that use geometrically shaped constellations that have increased capacity compared to conventional constellations operating within a similar SNR band. In several embodiments, the geometrically shaped is optimized based upon a capacity measure such as parallel decoding capacity or joint capacity. In many embodiments, a capacity optimized geometrically shaped constellation can be used to replace a conventional constellation as part of a firmware upgrade to transmitters and receivers within a communication system. In a number of embodiments, the geometrically shaped constellation is optimized for an Additive White Gaussian Noise channel or a fading channel. In numerous embodiments, the communication uses adaptive rate encoding and the location of points within the geometrically shaped constellation changes as the code rate changes. One embodiment of the invention includes a transmitter configured to transmit signals to a receiver via a communication channel, wherein the transmitter, includes a coder configured to receive user bits and output encoded bits at an expanded output encoded bit rate, a mapper configured to map encoded bits to symbols in a symbol constellation, a modulator configured to generate a signal for transmission via the communication channel using symbols generated by the mapper. In addition, the receiver includes a demodulator configured to demodulate the received signal via the communication channel, a demapper configured to estimate likelihoods from the demodulated signal, a decoder that is configured to estimate decoded bits from the likelihoods generated by the demapper. Furthermore, the symbol constellation is a capacity optimized geometrically spaced symbol constellation that provides a given capacity at a reduced signal-to-noise ratio compared to a signal constellation that maximizes d | 04-16-2009 |
20100195743 | METHODS AND APPARATUSES FOR SIGNALING WITH GEOMETRIC CONSTELLATIONS - Communication systems are described that use signal constellations, which have unequally spaced (i.e. ‘geometrically’ shaped) points. In many embodiments, the communication systems use specific geometric constellations that are capacity optimized at a specific SNR. In addition, ranges within which the constellation points of a capacity optimized constellation can be perturbed and are still likely to achieve a given percentage of the optimal capacity increase compared to a constellation that maximizes d | 08-05-2010 |
20120131409 | RATE-COMPATIBLE PROTOGRAPH LDPC CODE FAMILIES WITH LINEAR MINIMUM DISTANCE - Digital communication coding methods are shown, which generate certain types of low-density parity-check (LDPC) codes built from protographs. A first method creates protographs having the linear minimum distance property and comprising at least one variable node with degree less than 3. A second method creates families of protographs of different rates, all structurally identical for all rates except for a rate-dependent designation of certain variable nodes as transmitted or non-transmitted. A third method creates families of protographs of different rates, all structurally identical for all rates except for a rate-dependent designation of the status of certain variable nodes as non-transmitted or set to zero. LDPC codes built from the protographs created by these methods can simultaneously have low error floors and low iterative decoding thresholds. | 05-24-2012 |
20120147983 | METHODS AND APPARATUSES FOR SIGNALING WITH GEOMETRIC CONSTELLATIONS IN A RALEIGH FADING CHANNEL - Communication systems are described that use signal constellations, which have unequally spaced (i.e. ‘geometrically’ shaped) points. In many embodiments, the communication systems use specific geometric constellations that are capacity optimized at a specific SNR, over the Raleigh fading channel. In addition, ranges within which the constellation points of a capacity optimized constellation can be perturbed and are still likely to achieve a given percentage of the optimal capacity increase compared to a constellation that maximizes d | 06-14-2012 |
20120188058 | SYSTEMS AND METHODS FOR JOINT BEAMFORMING AND PREAMBLE DETECTION - Systems and methods for reading RFID tags using joint beamforming and preamble detection in accordance with embodiments of the invention are disclosed. One embodiment includes an antenna array comprising a plurality of antenna elements, a joint beamformer and preamble detector configured to receive inputs from each of the antenna elements, and a decoder configured to receive a resampled signal from the joint beamformer and preamble detector and to decode data using the resampled signal. In addition, the joint beamformer and preamble detector is configured to correlate the inputs from the antenna elements against a correlation sequence at a plurality of starting sample positions and predetermined rates, use the correlations to select a starting sample position and rate for decoding the received signal, use the correlations to determine beamforming coefficients for combining the inputs, and resample the combined inputs based upon the selected starting sample position and rate. | 07-26-2012 |
20130083862 | Design Methodology and Method and Apparatus for Signaling with Capacity Optimized Constellations - Communication systems are described that use geometrically shaped constellations that have increased capacity compared to conventional constellations operating within a similar SNR band. In several embodiments, the geometrically shaped is optimized based upon a capacity measure such as parallel decoding capacity or joint capacity. In many embodiments, a capacity optimized geometrically shaped constellation can be used to replace a conventional constellation as part of a firmware upgrade to transmitters and receivers within a communication system. In a number of embodiments, the geometrically shaped constellation is optimized for an Additive White Gaussian Noise channel or a fading channel. In numerous embodiments, the communication uses adaptive rate encoding and the location of points within the geometrically shaped constellation changes as the code rate changes. | 04-04-2013 |
20130099901 | Systems and Methods for Secure Supply Chain Management and Inventory Control - Systems for encoding and reading RFID tags on a collection of items are shown. One embodiment of the invention includes a plurality of items, where each item possesses an item identifier string, and a plurality of RFID tags, where an RFID tag is affixed to each of the items and each RFID tag is encoded with a code word element generated using at least all of the item identifier strings. In many embodiments, the collection is a plurality of goods contained within a case, pallet, container or storage area. | 04-25-2013 |
20130170571 | Methods and Apparatuses for Signaling with Geometric Constellations - Communication systems are described that use signal constellations, which have unequally spaced (i.e. ‘geometrically’ shaped) points. In many embodiments, the communication systems use specific geometric constellations that are capacity optimized at a specific SNR. In addition, ranges within which the constellation points of a capacity optimized constellation can be perturbed and are still likely to achieve a given percentage of the optimal capacity increase compared to a constellation that maximizes d | 07-04-2013 |
Christopher R. Jones, Los Angeles, CA US
Patent application number | Description | Published |
---|---|---|
20090122925 | Viterbi slicer for turbo codes - A method for synchronizing receivers that receive turbo encoded signals to a received signal. Turbo encoding may enable signals to be decoded at a much lower signal to noise ratio than previously practical. A traditional method of synchronizing a receiver to an incoming signal is to use a slicer to determine a received symbol and then to compare the determined symbol to the incoming waveform, in order to adjust the phase of the slicer with respect to the incoming signal. At signal low levels, at which turbo encoded signals may be decoded, this slicing method may be prone to errors that may disrupt the synchronization of the receiver to the incoming signal. By replacing the slicer by a Viterbi decoder with zero traceback (i.e., one which does not consider future values of the signal only past values) a prediction as to what the incoming signal is can be made. Because the Viterbi decoder can consider past signal values it can predict the present symbol being received with higher reliability than by using a slicer, which considers only the present value of the incoming signal. | 05-14-2009 |
20090285320 | Parallel concatenated code with soft-in soft-out interactive turbo decoder - A method for parallel concatenated (Turbo) encoding and decoding. Turbo encoders receive a sequence of input data tuples and encode them. The input sequence may correspond to a sequence of an original data source, or to an already coded data sequence such as provided by a Reed-Solomon encoder. A turbo encoder generally comprises two or more encoders separated by one or more interleavers. The input data tuples may be interleaved using a modulo scheme in which the interleaving is according to some method (such as block or random interleaving) with the added stipulation that the input tuples may be interleaved only to interleaved positions having the same modulo-N (where N is an integer) as they have in the input data sequence. If all the input tuples are encoded by all encoders then output tuples can be chosen sequentially from the encoders and no tuples will be missed. If the input tuples comprise multiple bits, the bits may be interleaved independently to interleaved positions having the same modulo-N and the same bit position. This may improve the robustness of the code. A first encoder may have no interleaver or all encoders may have interleavers, whether the input tuple bits are interleaved independently or not. Modulo type interleaving also allows decoding in parallel. | 11-19-2009 |
Christopher R. Jones, Peoria, IL US
Patent application number | Description | Published |
---|---|---|
20090114292 | Valve assembly - Although modern diesel fuel formulations are intended to reduce emissions of diesel engines, at least some of those modern fuels tend to have relatively low lubricity levels. The control valve assemblies described herein help to minimize any increased wear that would otherwise result from the use of such low lubricity fuels by providing a valve element, a valve guide, and an insert. The valve element is received within the valve guide and is moveable between an open position and a closed position. The insert forms a first sealed interface and a second sealed interface with the valve element and the valve guide. When the valve element is in the closed position, both of the first sealed interface and the second sealed interface are engaged. When the valve element is in the open position, only one of the first sealed interface and the second sealed interface is engaged. | 05-07-2009 |
20090272366 | Internal combustion engine set up method and fuel pump having installation assist mechanism - A method of setting up a common rail internal combustion engine system includes setting a fuel pump for a common rail of the engine system at a configuration where a camshaft of the fuel pump is rotationally stable. The rotationally stable configuration may be a configuration where forces acting on the camshaft are balanced. The engine may then be set in an engine timing state which is accordant with the pump configuration, and the pump installed on the engine when in its first configuration and when the engine is at the engine timing state. The pump may be designed such that it has an installation assist mechanism which obviates the need for specialized tools or set up strategies to install the fuel pump on the engine with a correct timing. | 11-05-2009 |
Christopher R. Jones, Wilmington, NC US
Patent application number | Description | Published |
---|---|---|
20090129529 | Shipping Container for Shipping Channeled Fuel Bundles - A shipping container is constructed for shipping channeled fuel bundle assemblies. The shipping container includes an outer container, an inner container sized to fit within the outer container, and shock absorbing material disposed at least between the outer and inner containers. The inner container is shaped to house at least one pre-channeled fuel bundle assembly including a channel, a channel fastener, and an array of fuel rods supported by grid spacers between an upper tie plate and a lower tie plate. The inner container includes a lower tie plate restraint device shaped to receive the lower tie plate and a lower portion of the channel, and an upper tie plate restraint device shaped to receive the upper tie plate and an upper portion of the channel and channel fastener assembly. The lower and upper tie plate restraint devices are lockable within the inner shipping container. | 05-21-2009 |
Christopher R. Jones, Pacific Pasadena, CA US
Patent application number | Description | Published |
---|---|---|
20080294969 | RATE-COMPATIBLE PROTOGRAPH LDPC CODE FAMILIES WITH LINEAR MINIMUM DISTANCE - Digital communication coding methods are shown, which generate certain types of low-density parity-check (LDPC) codes built from protographs. A first method creates protographs having the linear minimum distance property and comprising at least one variable node with degree less than 3. A second method creates families of protographs of different rates, all having the linear minimum distance property, and structurally identical for all rates except for a rate-dependent designation of certain variable nodes as transmitted or non-transmitted. A third method creates families of protographs of different rates, all having the linear minimum distance property, and structurally identical for all rates except for a rate-dependent designation of the status of certain variable nodes as non-transmitted or set to zero. LDPC codes built from the protographs created by these methods can simultaneously have low error floors and low iterative decoding thresholds, and families of such codes of different rates can be decoded efficiently using a common decoding architecture. | 11-27-2008 |
Christopher R. Jones, Washington, IL US
Patent application number | Description | Published |
---|---|---|
20140290626 | ASSEMBLING FUEL PUMP ON ENGINE - A method of assembling a fuel pump on an engine is disclosed. The method includes a timing pin installed between a pump flange of the fuel pump and a flywheel housing of the engine. The pump flange is moved towards the flywheel housing. The timing pin is further removed which is installed between the pump flange and the flywheel housing of the engine. Further, the pump flange is abutted with the flywheel housing of the engine. | 10-02-2014 |