Patents by Inventor John E. Hoffmann
John E. Hoffmann has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20150146765Abstract: A communications device may include a transmit path, a receive path operable simultaneously with the transmit path and at a same frequency as the transmit path, and processing circuitry. The processing circuitry may be configured to generate a baseband signal for the transmit path, generate a feedforward signal based upon the baseband signal, and use the feedforward signal to reduce self-interference in the receive path from the transmit path.Type: ApplicationFiled: November 27, 2013Publication date: May 28, 2015Applicant: Harris CorporationInventors: Christopher D. MOFFATT, John E. Hoffmann, Richard Lilley
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Publication number: 20150131620Abstract: A mobile device may generate reference bits. The mobile device may also produce a frame to send in an uplink transmission having two portions selectively with the reference bits or data bits.Type: ApplicationFiled: January 22, 2015Publication date: May 14, 2015Applicant: IPR LICENSING, INC.Inventors: John E. Hoffmann, George Rodney Nelson, James A. Proctor, Antoine J. Rouphael
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Publication number: 20150043567Abstract: Methods and apparatuses are disclosed regarding data rate and resource allocation decisions which are made for a communications channel, such as a wireless reverse connection. The wireless reverse connection may be between stations. One of the stations may be a base station and another station may be a field unit. The field unit may transmit data to a base station at a first data rate, based on a first resource allocation. Also, the field unit may transmit, to the base station, an indication, such as a digital data word, that the field unit has the capability to support the transmission of uplink data at a second data rate. The base station may transmit a second resource allocation to the field unit. After receiving the second resource allocation, the field unit may transmit additional uplink data to the base station at the second data rate based on the second resource allocation.Type: ApplicationFiled: August 18, 2014Publication date: February 12, 2015Applicant: IPR LICENSING, INC.Inventors: George R. Nelson, John E. Hoffmann, James A. Proctor, Antoine J. Rouphael
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Publication number: 20140376539Abstract: A technique for encoding digital communication signals. Data symbols are augmented in pilot symbols inserted at predetermined positions. The pilot augmented sequence is then fed to a deterministic error correction block encoder, such as a turbo product coder, to output a coded sequence. The symbols in the error correction encoded sequence are then rearranged to ensure that the output symbols derived from input pilot symbols are located at regular, predetermined positions. As a result, channel encoding schemes can more easily be used which benefits from power of two length block sizes.Type: ApplicationFiled: September 8, 2014Publication date: December 25, 2014Applicant: IPR LICENSING, INC.Inventors: John E. Hoffmann, George R. Nelson, James A. Proctor, Antoine J. Rouphael, III
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Patent number: 8830977Abstract: A technique for encoding digital communication signals. Data symbols are augmented in pilot symbols inserted at predetermined positions. The pilot augmented sequence is then fed to a deterministic error correction block encoder, such as a turbo product coder, to output a coded sequence. The symbols in the error correction encoded sequence are then rearranged to ensure that the output symbols derived from input pilot symbols are located at regular, predetermined positions. As a result, channel encoding schemes can more easily be used which benefits from power of two length block sizes.Type: GrantFiled: December 5, 2011Date of Patent: September 9, 2014Assignee: IPR Licensing, Inc.Inventors: John E. Hoffmann, George R. Nelson, Jr., James A. Proctor, Jr., Antoine J. Rouphael
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Patent number: 8811367Abstract: Data rate allocation decisions are made for a communications channel. A message is sent on a communication channel such as on a paging channel. The message indicates a forward Effective Radiate Power (ERP) of a pilot signal transmitted. The remote station then determines the received signal strength of this pilot signal, taking into account receiver gains. The path loss may be estimated as the difference between the forward ERP data value received and the detected received pilot power. This transmit power level information is encoded as a digital data word together with the forward path loss information. Upon transmission, the forward path loss estimate as calculated and the output power value can then help determine the amount of excess power available. This is indicative of the amount of dynamic range available in the transmit power amplifier. Coding rates which require a higher dynamic range may be acceptable for use.Type: GrantFiled: December 6, 2005Date of Patent: August 19, 2014Assignee: IPR Licensing, Inc.Inventors: George Rodney Nelson, Jr., James A. Proctor, Jr., John E. Hoffmann, Antoine J. Rouphael
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Patent number: 8619908Abstract: A wireless ranging system for determining a range of a remote wireless device may include a wireless transmitter and a wireless receiver. The wireless ranging system may also include a ranging controller to cooperate with the wireless transmitter and receiver to generate a multi-carrier base waveform, transmit a sounder waveform to the remote wireless device including concatenated copies of the multi-carrier base waveform, and receive a return waveform from the remote wireless device in response to the sounder waveform. The ranging controller may also generate time domain samples from the return waveform, convert the time domain samples into frequency domain data, and process the frequency domain data to determine the range of the remote wireless device.Type: GrantFiled: December 2, 2009Date of Patent: December 31, 2013Assignee: Harris CorporationInventors: John E. Hoffmann, Carlos G. Abascal, Christopher D. Moffatt
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Publication number: 20130322341Abstract: In an illustrative embodiment of the present invention, a reference signal including pilot information is transmitted from a base station to one or multiple field units over a pilot channel. A message is also sent to the field units over a paging channel to indicate an effective radiated power level at which the reference signal is transmitted on the pilot channel. Based on a received power level of the reference signal at a field unit and the effective radiated power level of the reference signal, a forward path loss is estimated at the field unit for the forward link between the base station and field unit. Assuming the path loss in the reverse link is approximately the same as the estimated forward link path loss, the field unit can transmit, a reply message in the reverse link so that the base station generally receives a message at-a desired power level.Type: ApplicationFiled: August 9, 2013Publication date: December 5, 2013Applicant: IPR LICENSING, INC.Inventors: George R. Nelson, JR., James A. Proctor, JR., John E. Hoffmann, Antoine J. Rouphael
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Publication number: 20130301636Abstract: A method for use in a field unit operable in a wireless communication network. The method includes receiving an indication of a plurality of access identifiers from a base station. The field unit selects an access identifier from the plurality of access identifiers received from the base station. The selected access identifier is associated with a type of field unit request. The field unit transmits the selected access identifier to the base station. The field unit then receives a message from the base station. The message is based on the transmitted selected access identifier. The message contains a timing adjustment that indicates an amount to advance timing. A corresponding field unit apparatus, a base station method, and corresponding base station apparatus is also disclosed.Type: ApplicationFiled: July 10, 2013Publication date: November 14, 2013Inventors: G. Rodney Nelson, JR., John E. Hoffmann, Antoine J. Rouphael, James A. Proctor
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Patent number: 8509268Abstract: A method for use in a field unit operable in a wireless communication network. The method includes receiving an indication of a plurality of access identifiers from a base station. The field unit selects an access identifier from the plurality of access identifiers received from the base station. The selected access identifier is associated with a type of field unit request. The field unit transmits the selected access identifier to the base station. The field unit then receives a message from the base station. The message is based on the transmitted selected access identifier. The message contains a timing adjustment that indicates an amount to advance timing. A corresponding field unit apparatus, a base station method, and corresponding base station apparatus is also disclosed.Type: GrantFiled: December 22, 2011Date of Patent: August 13, 2013Assignee: Intel CorporationInventors: G. Rodney Nelson, Jr., John E. Hoffmann, Antoine J. Rouphael, James A. Proctor, Jr.
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Patent number: 8509835Abstract: In an illustrative embodiment of the present invention, a reference signal including pilot information is transmitted from a base station to one or multiple field units over a pilot channel. A message is also sent to the field units over a paging channel to indicate an effective radiated power level at which the reference signal is transmitted on the pilot channel. Based on a received power level of the reference signal at a field unit and the effective radiated power level of the reference signal, a forward path loss is estimated at the field unit for the forward link between the base station and field unit. Assuming the path loss in the reverse link is approximately the same as the estimated forward link path loss, the field unit can transmit, a reply message in the reverse link so that the base station generally receives a message at a desired power level.Type: GrantFiled: March 26, 2003Date of Patent: August 13, 2013Assignee: IPR Licensing, Inc.Inventors: George R. Nelson, Jr., James A. Proctor, Jr., John E. Hoffmann, Antoine J. Rouphael
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Patent number: 8472537Abstract: The device, system and method reduce the peak-to-average power ratio (PAPR) of a signal field symbol in a multi-carrier modulation communication signal. The device includes an antenna, a transceiver coupled to the antenna, and a controller to cooperate with the transceiver and being configured to reduce the PAPR of the signal field symbol in the multi-carrier modulation communication signal. The controller is configured to transmit information using a frame format including a header and a data field, the header having a signal field and a service field each having a plurality of bits, the plurality of bits of the signal field defining the signal field symbol. The controller selectively changes at least the header bits to generate the signal field symbol with a reduced or lowest PAPR.Type: GrantFiled: March 2, 2010Date of Patent: June 25, 2013Assignee: Harris CorporationInventors: David M. Browning, John E. Hoffmann
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Patent number: 8315294Abstract: A method for synchronizing a CDMA receiver to a transmitter when an adaptive antenna is utilized to receive transmitted data, wherein a receiving antenna system is adapted between a 360° reception angle pattern (i.e., an omni-directional pattern) and a fixed reception angle (i.e., a directional pattern) by permitting the receiver to identify a pilot signal having the largest magnitude. The receiver minimizes interference from other pilot signals by steering antenna pattern nulls toward other transmitters. As a result, the time required for the receiver to acquire a valid pilot signal is significantly reduced.Type: GrantFiled: March 28, 2011Date of Patent: November 20, 2012Assignee: IPR Licensing, Inc.Inventors: James A. Proctor, Jr., Antoine J. Rouphael, John E. Hoffmann, George R. Nelson, Jr.
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Publication number: 20120250798Abstract: The present invention provides for making code rate adjustments and modulation type adjustments in a pseudonoise (PN) encoded CDMA system. Coding rate adjustments may be made by changing the number of information bits per symbol, or Forward Error Code (FEC) coding rate. A forward error correction (FEC) block size is maintained at a constant amount. Therefore, as the number of information bits per symbol are increased, an integer multiple of bits per epoch is always maintained. The scheme permits for a greater flexibility and selection of effective data rates providing information bit rates ranging from, for example, approximately 50 kilobits per second to over 5 mega bits per second (Mbps) in one preferred embodiment.Type: ApplicationFiled: June 11, 2012Publication date: October 4, 2012Applicant: IPR LICENSING, INC.Inventors: John E. Hoffmann, George Rodney Nelson, JR., Daniel I. Riley, Antoine J. Rouphael, James A. Proctor, JR.
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Patent number: 8189697Abstract: A communications device includes a demapping and demodulation circuit that demaps and demodulates an OFDM communications signal as modulated subcarriers carrying communications data and modulated subcarriers carrying a training sequence forming a preamble that includes a long sync sequence for channel and frequency offset estimation having a extended guard interval (GI). The OFDM subcarriers carrying the training sequence have a quadratic modulation to produce a low peak-to-average power (PAPR) preamble with PAPR of approximately 2.6 decibels (dB). A channel estimate circuit is positioned to receive signals after processing within a FFT circuit and subcarrier demapper circuit and estimates the channel characteristics of the communications channel based on splitting the extended guard interval from the long sync sequence and processing into values that represent the low PAPR preamble as plus or minus one (+/?1) values in a real or imaginary component as adds and subtracts.Type: GrantFiled: October 1, 2008Date of Patent: May 29, 2012Assignee: Harris CorporationInventors: Christopher D. Moffatt, John E. Hoffmann
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Patent number: 8175178Abstract: A communications device includes communications data and a training sequence corresponding to a preamble. A modulation and mapping circuit modulates the communications data and training sequence into a plurality of multiple subcarriers that are orthogonal to each other to form an OFDM communication signal having modulated subcarriers carrying the communications data forming a data payload and modulated subcarriers forming the preamble. A circuit turns OFF and ON selected subcarriers based on an encryption algorithm to increase transmit power and signal-to-noise ratio and reduce the Inter-Carrier Interference (ICI). The modulation and mapping circuit applies a quadratic modulation to the subcarriers carrying the training sequences to produce a low peak-to-average power ratio (PAPR) preamble with a PAPR value of approximately 2.6 decibels (dB).Type: GrantFiled: October 1, 2008Date of Patent: May 8, 2012Assignee: Harris CorporationInventors: Christopher D. Moffatt, John E. Hoffmann
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Patent number: 8175120Abstract: Multiple field units in a CDMA system are synchronized for communication with a base station using a shared forward and reverse link channel. Each field unit is assigned a time slot in a forward link channel to receive messages from the base station. Likewise, each field unit is assigned a time slot on a common reverse link channel for transmitting messages to the base station. Timing alignment among each of many field units and the base station is achieved by analyzing messages received at the base station in a corresponding time slot from each field unit. Thereafter, a message is transmitted in a corresponding time slot to a particular field unit from the base station for adjusting its timing so that future messages transmitted from the field unit are received in the appropriate time slot at the base station.Type: GrantFiled: February 7, 2001Date of Patent: May 8, 2012Assignee: IPR Licensing, Inc.Inventors: G. Rodney Nelson, Jr., John E. Hoffmann, Antoine J. Rouphael, James A. Proctor, Jr.
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Patent number: 8165232Abstract: A communications device includes communications data and a training sequence corresponding to a preamble. A modulation and mapping circuit modulates the communications data and training sequence into a plurality of multiple subcarriers that are orthogonal to each other to form an orthogonal frequency division multiplexing (OFDM) communications signal having modulated subcarriers carrying the communications data forming a data payload and modulated subcarriers forming the preamble. The modulation and mapping circuit applies a quadratic modulation to the subcarriers carrying the training sequences to produce a low peak-to-average power (PAPR) preamble of approximately 2.6 decibels (dB) independent of the number of subcarriers.Type: GrantFiled: October 1, 2008Date of Patent: April 24, 2012Assignee: Harris CorporationInventors: Christopher D. Moffatt, John E. Hoffmann
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Publication number: 20120093131Abstract: A method for use in a field unit operable in a wireless communication network. The method includes receiving an indication of a plurality of access identifiers from a base station. The field unit selects an access identifier from the plurality of access identifiers received from the base station. The selected access identifier is associated with a type of field unit request. The field unit transmits the selected access identifier to the base station. The field unit then receives a message from the base station. The message is based on the transmitted selected access identifier. The message contains a timing adjustment that indicates an amount to advance timing. A corresponding field unit apparatus, a base station method, and corresponding base station apparatus is also disclosed.Type: ApplicationFiled: December 22, 2011Publication date: April 19, 2012Applicant: IPR LICENSING, INC.Inventors: G. Rodney Nelson, JR., John E. Hoffmann, Antoine J. Rouphael, James A. Proctor, JR.
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Patent number: 8160165Abstract: A communications device includes communication data and a training sequence corresponding to a preamble. A modulation and mapping circuit modulates the communications data and training sequence into a plurality of multiple subcarriers that are orthogonal to each other to form an OFDM communications signal having modulated subcarriers carrying the communications data forming a data payload and modulated subcarriers forming the preamble. A pseudo-random signal generator is operative with the modulation and mapping circuit and generates pseudo-random signals based on an encryption algorithm for frequency hopping each subcarrier at an OFDM symbol rate. The modulation and mapping circuit applies a quadratic modulation to the subcarriers carrying the training sequences to produce a low peak-to-average power ratio (PAPR) preamble with a PAPR value of approximately 2.6 decibels (dB).Type: GrantFiled: October 1, 2008Date of Patent: April 17, 2012Assignee: Harris CorporationInventors: Christopher D. Moffatt, John E. Hoffmann