Patents by Inventor Paul W. Dent

Paul W. Dent 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).

  • Publication number: 20110150049
    Abstract: A method and apparatus for efficiently providing a large volume of channel feedback, e.g., for OFDM MISO and MIMO systems, is described herein. To that end, a mapping unit in an OFDM transceiver maps channel feedback values, e.g., received reference signal values or channel estimates derived therefrom, on a one-to-one basis to individual transmission subchannels. More particularly, the mapping unit maps a feedback value, e.g., the received reference value or a channel estimate derived therefrom, to a single transmission subchannel of an outgoing OFDM signal. For example, the mapping unit may map the feedback value to an input of a frequency transform unit, such as an inverse discrete Fourier transform unit, to map the feedback value to a single transmission subchannel comprising an OFDM transmission subcarrier. The OFDM transceiver transmits the outgoing OFDM signal to the remote transceiver to provide the feedback value to the remote transceiver.
    Type: Application
    Filed: December 23, 2009
    Publication date: June 23, 2011
    Inventor: Paul W. Dent
  • Publication number: 20110122767
    Abstract: A wire-based infrastructure capable of delivering high data rates is described herein. A transmission system, reception system, and/or repeater uses wire-mapping code matrices to reduce interference in multi-wire cables to increase the data rate provided by such multi-wire cables. More particularly, code mapping matrices are applied to transmission and/or received input signals to generate a mapped signal for each output wire or corresponding to each input wire such that each mapped signal comprises a different combination of all of the input signals. Different ones of the wire-mapped signals are ultimately transmitted on different wires. In so doing, the present invention facilitates crosstalk reduction, and therefore, provides a technique that increases the data rate available on multi-wire cables.
    Type: Application
    Filed: November 23, 2009
    Publication date: May 26, 2011
    Inventor: Paul W. Dent
  • Publication number: 20110080936
    Abstract: The technology in this application spreads a signal over an available discontinuous spectrum, such as a radio frequency band, so that the spread signal only occupies the non-contiguous spectrum. In this way, CDMA transmission and reception can be used in a fragmented or non-contiguous spectrum that otherwise would not be useable for direct sequence spreading. Spreading over non-contiguous portions of spectrum is preferably performed without producing unacceptable interference in portions of unavailable spectrum located between the allowed spectrum. By avoiding unacceptable interference in portions of unavailable spectrum located between the allowed spectrum, the unavailable spectrum may be used by other users or services.
    Type: Application
    Filed: December 13, 2010
    Publication date: April 7, 2011
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Paul W. DENT
  • Patent number: 7864663
    Abstract: The technology in this application spreads a signal over an available discontinuous spectrum, such as a radio frequency band, so that the spread signal only occupies the non-contiguous spectrum. In this way, CDMA transmission and reception can be used in a fragmented or non-contiguous spectrum that otherwise would not be useable for direct sequence spreading. Spreading over non-contiguous portions of spectrum is preferably performed without producing unacceptable interference in portions of unavailable spectrum located between the allowed spectrum. By avoiding unacceptable interference in portions of unavailable spectrum located between the allowed spectrum, the unavailable spectrum may be used by other users or services.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: January 4, 2011
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Paul W. Dent
  • Patent number: 7511640
    Abstract: Method and apparatus are configured to assign a code of less than N number of bits in length to a pattern of bits of a first polarity value distributed within a block of N binary bits. The method basically comprises (1) determining a number of bits of the first value in the block of N binary bits; (2) selecting a base value based on the determined number of bits of the first value; (3) determining a displacement value representative of a particular distribution of the determined number of bits of the first value in the block of N binary bits; and (4) adding the base value and the displacement value to obtain a sum and using the sum to form an assigned code. The base value is preferably selected by evaluating an Expression Io=NC1+NC2+NC3 . . . +NCK?1, wherein K is the determined number of bits of the first value in the block of N binary bits.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: March 31, 2009
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Paul W. Dent
  • Publication number: 20090003472
    Abstract: A communication system (20) comprises a transmitter (22) and a receiver (24). The transmitter (22) comprises a source of information symbols (30); a pulse shaping wave function generator (32); and a combiner (34) configured to express the information symbols received from the source as signals which are shaped in time and frequency domains by the wave function. The pulse shaping wave function generator (32) is configured to provide a wave function which has the Nyquist property and has a same shape as its own Fourier transform. The combiner (34) is configured to combine the wave function with a stream of digital data symbols to produce a filtered stream for transmission by the transmitter.
    Type: Application
    Filed: May 23, 2008
    Publication date: January 1, 2009
    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventor: Paul W. DENT
  • Publication number: 20080291977
    Abstract: A satellite broadcasts radio programs to mobile and fixed receivers at various locations. Ground stations supplement the satellite broadcasts in areas where the satellite signal may be shadowed. Likewise, the satellite signal supplements the terrestrial transmissions in areas with marginal terrestrial signal strength. Ground stations and a satellite transmit the same digital symbol stream over a same frequency spectrum. The symbol streams arrive in each service area of the ground stations with a relative delay that is within a window for which a receiver is adapted to decode efficiently. Spectral efficiency is achieved by allowing the ground stations to share the same frequencies as the satellites.
    Type: Application
    Filed: February 20, 2008
    Publication date: November 27, 2008
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Paul W. DENT
  • Publication number: 20080291821
    Abstract: The technology in this application solves these problems (and others) and meets the desirable goals identified above (and others). The technology spreads a signal over an available discontinuous spectrum, such as a radio frequency band, so that the spread signal only occupies the non-contiguous spectrum. In this way, CDMA transmission and reception can be used in a fragmented or non-contiguous spectum that otherwise would not be useable for direct sequence spreading. Spreading over non-contiguous portions of spectrum is preferably performed without producing unacceptable interference in portions of unavailable spectrum located between the allowed spectrum. By avoiding unacceptable interference in portions of unavailable spectrum located between the allowed spectrum, the unavailable spectrum may be used by other users or services.
    Type: Application
    Filed: October 30, 2007
    Publication date: November 27, 2008
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Paul W. Dent
  • Publication number: 20080285534
    Abstract: A first orthogonal codeset, obtainable in various manners, is used in a first cell to provide orthogonal spreading codes for traffic signals originating within the first cell. A second orthogonal code set for use in a second cell is obtained that has at least a first code in common with the first orthogonal code set by selecting any code in the first codeset to be the first common code. The plural orthogonal codesets can be utilized in various ways and in various environments. For example, the plural orthogonal codesets can be used for operation of a user equipment unit in a code division multiple access (CDMA) network.
    Type: Application
    Filed: July 6, 2005
    Publication date: November 20, 2008
    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PBL)
    Inventor: Paul W. Dent
  • Patent number: 7443826
    Abstract: Code division multiple access signals received through at least one multipath propagation channel are processed to produce at least one relative frequency error estimate. This involves receiving and processing the signals using a local frequency reference oscillator to obtain representative complex numerical samples for processing. The complex numerical samples are correlated with shifts of a locally generated despreading code and a number of complex channel estimates are produced, each corresponding to a different delayed ray of the at least one multipath propagation channel. A frequency error estimate is computed for each ray based on successive values of a respective one of the channel estimates, and a weighted summation of the frequency error estimates is performed to provide at least one relative frequency error estimate.
    Type: Grant
    Filed: October 4, 2000
    Date of Patent: October 28, 2008
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Roozbeh Atarius, Gregory Bottomley, Paul W. Dent
  • Publication number: 20080259891
    Abstract: A multi-bit acknowledgement word (44) is prepared by a first communications station 22 (such as a base station) for separately acknowledging the success or failure of data packets received over plural communication channels (42) from respective plural second communication stations 28 (such as terminals). The acknowledgement word (44) is a “joint” or “common” acknowledgement word in the sense that one and the same acknowledgement word provides acknowledgement information for data packets received from plural second communication stations. Either separately or in conjunction with the joint acknowledgement word, a terminal checking code (62) can be employed for determining whether a packet is received on a both in a correct channel and from a correct terminal. The terminal checking code (62) comprise a cyclic redundancy check code formed over data bits (66) of the data packet and a terminal identifier (68) of the terminal (28).
    Type: Application
    Filed: April 17, 2007
    Publication date: October 23, 2008
    Inventor: Paul W. Dent
  • Patent number: 7440489
    Abstract: A spread spectrum signal is processed by correlating the spread spectrum signal with a spreading sequence at a first plurality of correlation times to produce a first plurality of time-offset correlations. The first plurality of time-offset correlations is processed to produce a first symbol representation for a symbol. A first quality is determined for the first symbol representation. Responsive to the determined first quality, it is determined whether to further process the first symbol representation or to process a second symbol representation for the symbol generated from the spread spectrum signal. The first quality may be determined, for example, by decoding the first symbol representations to generate a decoding metric or error check indicator, such as a CRC result. The symbol representations may be generated and/or evaluated for quality in a serial fashion or a parallel fashion.
    Type: Grant
    Filed: August 7, 2001
    Date of Patent: October 21, 2008
    Assignee: Ericsson Inc.
    Inventors: Erik Dahlman, Yi-Pin Eric Wang, Paul W. Dent, Gregory E. Bottomley, Ali Khayrallah, Christer Östberg
  • Publication number: 20080180286
    Abstract: Method and apparatus are configured to assign a code of less than N number of bits in length to a pattern of bits of a first polarity value distributed within a block of N binary bits. The method basically comprises (1) determining a number of bits of the first value in the block of N binary bits; (2) selecting a base value based on the determined number of bits of the first value; (3) determining a displacement value representative of a particular distribution of the determined number of bits of the first value in the block of N binary bits; and (4) adding the base value and the displacement value to obtain a sum and using the sum to form an assigned code. The base value is preferably selected by evaluating an Expression Io=NC1+NC2+N C3 . . . +NCK?1, wherein K is the determined number of bits of the first value in the block of N binary bits.
    Type: Application
    Filed: January 31, 2007
    Publication date: July 31, 2008
    Inventor: Paul W. Dent
  • Patent number: 7305211
    Abstract: A satellite communications system uses multiple ground stations and one or more satellites for communicating between mobile subscribers and a land-based communications network, such as the PSTN or the Internet. Multiple ground stations geographically dispersed minimize toll charges incurred routing calls from a mobile subscriber through the land network by reducing the need for long-distance calling. Further, because each ground station communicates with a given satellite using the same frequency spectrum, the subscriber capacity of the system increases and/or bandwidth requirements for the communications link between ground stations and satellites may be reduced. The present system uses ground-based beamforming techniques enabling each satellite to transmit signals in multiple transmission beams, each beam supporting one or more mobile subscribers. Each beam may reuse the same frequency spectrum, thereby increasing the number of subscribers supported by each satellite.
    Type: Grant
    Filed: July 20, 2004
    Date of Patent: December 4, 2007
    Assignee: Ericsson Inc.
    Inventor: Paul W. Dent
  • Patent number: 7224942
    Abstract: Transmitting non-polluting dummy pilot signals in a wireless communication network permits estimation of the downlink propagation channels between a number of joint transmitters and a lesser number of receivers. With fewer receivers than transmitters, loop back information from the receivers is not sufficient to determine the downlink propagation channels between the transmitters and receivers. For N transmitters and M receivers, (N-M) dummy pilot symbols are transmitted to facilitate downlink channel estimation. Each dummy pilot signal is transmitted to an imagined or dummy receiver that is virtually located such that its downlink channel coefficient vector is orthogonal to those of the real receivers. Transmit pre-filtering based on estimated propagation channels is applied to the information signals for the real receivers and to the dummy pilot signals. The extent to which the dummy pilot signals interfere at each receiver is an indication of mismatch between estimated and actual propagation channels.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: May 29, 2007
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Paul W. Dent
  • Patent number: 7221905
    Abstract: A dual-mode telephone with a satellite communication adapter is disclosed. According to one embodiment of the present invention, a cellular-type handportable phone is equipped with a connector for the attachment of accessories. This connector provide a satellite communications adapter accessory access to the handset's signal processing resources which may operate in an alternative mode to process signals received from the satellite and converted by the adapter into a suitable form for processing. The processing translates the satellite signals into voice or data, and vice-versa.
    Type: Grant
    Filed: October 21, 2002
    Date of Patent: May 22, 2007
    Assignee: Ericsson Inc.
    Inventor: Paul W. Dent
  • Patent number: 7209511
    Abstract: Transmitted signals from plurality of mobile terminals are received at one or more base stations in a Code Division Multiple Access system. The base stations send the received signals to a central processor in the form of complex signal sample streams. The central processor determines the correlations between the spreading codes used by the mobile terminals and combines the interference correlations with channel estimates to form an interference matrix. The central processor uses the interference matrix to process the received signals reduce the interference between signals from different mobile terminals.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: April 24, 2007
    Assignee: Ericsson Inc.
    Inventor: Paul W. Dent
  • Patent number: 7197282
    Abstract: Processing of loop-back information returned by one or more mobile stations that are served by a wireless communication network permits the network to compensate its transmit signals for increased transmission efficiency and reduced signal interference at the mobile stations. Generally, the network forms one or more transmit signals as a combination of different signals intended for the different mobile stations, and remembers transmit information associated with these transmit signals. The mobile stations return loop-back signals to the network, which determines transmit signal compensation information by comparing loop-back information to memorized information. The mobile stations may loop-back samples from composite received signals, from processed received signal samples, or loop-back estimates.
    Type: Grant
    Filed: April 30, 2002
    Date of Patent: March 27, 2007
    Assignee: Ericsson Inc.
    Inventors: Paul W. Dent, Kambiz C. Zangi, Leonid Krasny
  • Patent number: 7184492
    Abstract: The invention comprises using beamforming antenna to coherently transmit an information signal to a receiver using two or more directional beams. In one embodiment, the phase and timing of the information signals carried by each directional beams are adjusted such that the signals arrive synchronously at the mobile terminal. Time synchronization may be obtained by delaying signals transmitted on selected directional beams to compensate for different propagation delays, or by preconditioning and filtering the signals using a channel coefficient matrix.
    Type: Grant
    Filed: February 10, 2003
    Date of Patent: February 27, 2007
    Assignee: Ericsson Inc.
    Inventor: Paul W. Dent
  • Patent number: RE39980
    Abstract: A Code Division Multiple Access (CDMA) communication system which contains a calling channel which is used to inform silent mobiles that they are being called. In the system, the calling channel is chosen to be the strongest overlapping signal so that it reaches mobiles which are located on the cells extreme boundaries. The interference other signals experience because the overlap with the calling channel may be avoided by having the mobiles first demodulate the calling channel signal and then subtract it out before demodulating their own signal.
    Type: Grant
    Filed: December 26, 1996
    Date of Patent: January 1, 2008
    Assignee: Ericsson, Inc.
    Inventor: Paul W. Dent