Having A Signaling Constellation Patents (Class 370/207)
  • Patent number: 10291449
    Abstract: Method and apparatus for use within a wireless OFDM network that transmits a first packet type in a first channel bandwidth and a second packet type in a second channel bandwidth, the first channel bandwidth being at least two times wider than the second channel bandwidth. The first packet type has a header field with two parts with each part comprising a different set of header bits. The two parts of the header field are transmitted using two OFDM symbols. The second packet type has a header field with four parts with the first and second parts comprising the same first set of header bits and the third and the fourth part comprising the same second set of header bits. The four parts of the header field are transmitted using four OFDM symbols. The second packet type provides more reliable transmission than the first packet type.
    Type: Grant
    Filed: September 7, 2018
    Date of Patent: May 14, 2019
    Assignee: APPLIED TRANSFORM, LLC
    Inventors: Joon Bae Kim, Marcos C. Tzannes
  • Patent number: 10250425
    Abstract: A receiver recovers local service data symbols from first Orthogonal Frequency Division Multiplexed (OFDM) symbols in the presence of second OFDM symbols, the second OFDM symbols carry national broadcast data symbols and modulated on to the sub-carriers of the second OFDM symbols using a first modulation scheme, and the first OFDM symbols carry the national broadcast data symbols and the local service data symbols from a local insertion pipe and modulated on to the sub-carriers of the first OFDM symbols using a second modulation scheme.
    Type: Grant
    Filed: April 6, 2017
    Date of Patent: April 2, 2019
    Assignee: SONY CORPORATION
    Inventors: Samuel Asangbeng Atungsiri, Matthew Paul Taylor, Obioma Okehie
  • Patent number: 10171989
    Abstract: A wireless communication device (16A) is configured to receive user data from a radio network node (18) in a wireless communication system (10) that includes a data channel (26) over which user data is transmitted and a control channel (24) over which control data is transmitted. The device (16A) receives over the control channel (24) a hierarchically-modulated symbol (28) which conveys control data on a control-data modulation layer (30A) and conveys user data on a user-data modulation layer (30B). The control-data modulation layer (30A) is recoverable via demodulation at a lower order, and the user-data modulation layer (30B) is recoverable via demodulation at a higher order. The lower order is lower than the higher order and is generally predefined independent of conditions on the control channel (24). The device (16A) recovers the user data received over the control channel (24) by demodulating at least the user-data modulation layer (30B) at the higher order.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: January 1, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Akram Bin Sediq, Ahmed Nouah
  • Patent number: 10158417
    Abstract: A radio communication system includes: a plurality of base stations; and a relay station, which relays communication between any one of the plurality of base stations and a terminal, wherein the plurality of base stations include a master station, which communicates with the relay station, and a peripheral base station, which does not communicate with the relay station, and wherein when a signal of a control channel of the master station is not able to be received, the relay station transmits a communication unavailable signal to the master station and the peripheral base station.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: December 18, 2018
    Assignee: KYOCERA Corporation
    Inventor: Takahiro Oyabu
  • Patent number: 10117243
    Abstract: A method of acquiring information on a resource region for transmitting PHICH and a method of receiving PDCCH using the same are disclosed. The resource region for transmitting the PHICH can be specified by first information corresponding to the per-sub frame PHICH number and second information corresponding to a duration of the PHICH within the subframe. The first Information can be specified into a form resulting from multiplying a predetermined basic number by a specific constant. And, the specific constant can be transmitted via PBCH. Moreover, the second information can be acquired from the PBCH as well.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: October 30, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Joon Kui Ahn, Bong Hoe Kim, Young Woo Yun, Ki Jun Kim, Jung Hoon Lee, Dae Won Lee, Dong Youn Seo, Dong Wook Roh, Suk Hyon Yoon
  • Patent number: 10090954
    Abstract: A bit allocation method and apparatus for a multicarrier modulation signal and a system where the method includes: determining a signal to noise ratio margin according to a predefined probability of a maximum clipping noise that can be allowed by the system; and allocating the number of modulating bits and power in each subcarrier for a multicarrier modulation signal according to the signal to noise ratio margin. By presetting a signal to noise ratio margin for a clipping noise, tolerance of the signal for the clipping noise is increased, and bit error rate is efficiently lowered.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: October 2, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Hao Chen, Lei Li
  • Patent number: 10038513
    Abstract: A bit allocation method and apparatus for a multicarrier modulation signal and a system where the method includes: determining a signal to noise ratio margin according to a predefined probability of a maximum clipping noise that can be allowed by the system; and allocating the number of modulating bits and power in each subcarrier for a multicarrier modulation signal according to the signal to noise ratio margin. By presetting a signal to noise ratio margin for a clipping noise, tolerance of the signal for the clipping noise is increased, and bit error rate is efficiently lowered.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: July 31, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Hao Chen, Lei Li
  • Patent number: 9967871
    Abstract: The application pertains to a method for communicating downlink control information. A base station maps an enhanced physical downlink control channel (E-PDCCH) sequentially to resource elements for transmitting the E-PDCCH in each orthogonal frequency division multiplexing (OFDM) symbol according to an order of OFDM symbols used by the E-PDCCH of a user equipment (UE). The E-PDCCH is sent to the UE from the base station by using the resource elements, where the E-PDCCH and a physical downlink shared channel (PDSCH) invoked by the E-PDCCH are frequency-division multiplexed. Because the E-PDCCH is mapped sequentially to resource elements for transmitting the E-PDCCH in each OFDM symbol according to an order of OFDM symbols used by the E-PDCCH of the UE, different control channel elements of E-PDCCHs at different aggregation levels will not include a same E-PDCCH modulation symbol, thereby ensuring that the UE judges a start position of the E-PDCCH correctly.
    Type: Grant
    Filed: January 4, 2017
    Date of Patent: May 8, 2018
    Assignee: Huawei Device Co., Ltd.
    Inventors: Yingyang Li, Chi Gao
  • Patent number: 9942067
    Abstract: Provided is a transmission method that contributes to an increase in data reception quality when iterative detection is performed at a receive apparatus side. A transmit apparatus alternates between two types of modulation scheme that each shift amplitude and phase, performs mapping to constellation points according to a selected modulation scheme, and transmits a modulated signal obtained by mapping.
    Type: Grant
    Filed: September 21, 2016
    Date of Patent: April 10, 2018
    Assignee: SUN PATENT TRUST
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 9935673
    Abstract: Wireless communication wherein channel estimation accuracy is improved while keeping the position of each bit in a frame, even when a modulation system having a large modulation multiple value is used for a data symbol. An encoding operation encodes and outputs transmitting data (bit string) and a bit converting operation converts at least one bit of a plurality of bits constituting a data symbol to be used for channel estimation, among the encoded bit strings, into ‘1’ or ‘0’. A modulating operation modulates the bit string inputted from the bit converting operation by using a single modulation mapper and a plurality of data symbols are generated.
    Type: Grant
    Filed: July 18, 2017
    Date of Patent: April 3, 2018
    Assignee: PANASONIC CORPORATION
    Inventors: Kenichi Miyoshi, Hidetoshi Suzuki, Katsuhiko Hiramatsu, Christian Wengerter, Alexander Golitschek Edler Von Elbwart
  • Patent number: 9756334
    Abstract: A digital television system performing modulation/demodulation by VSB (vestigial side band) is provided. The invention includes a VSB transmitter including an additional error correction encoder designed such that a signal mapping of a TCM encoder is considered, a multiplexer (MUX), a TCM encoder operating in correspondence with state transition processes of the additional error correction encoder, and a signal transmission part including an RF converter. The invention further includes a VSB receiver including a signal receiver part receiving a signal transmitted from the transmitter, a TCM decoder, a signal processing part including a derandomizer, and an additional error correction decoder part.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: September 5, 2017
    Assignee: LG ELECTRONICS INC.
    Inventors: In Hwan Choi, Young Mo Gu, Kyung Won Kang, Kook Yeon Kwak
  • Patent number: 9698828
    Abstract: A two-dimensional interleaving method is provided. The two-dimensional interleaving method includes dividing a first page having N2×N2 pixels, N being a natural number, into a plurality of blocks, wherein each of the plurality of blocks includes N×N pixels, rearranging each of the plurality of the blocks of the first page into a second page, wherein each of two index located at same position in two adjacent block of the first page, respectively, is rearranged to have at least a dispersion distance D in the second page, and relocating an index pixel located at same position of each of the plurality of the blocks of the first page into a k-th block of the second page.
    Type: Grant
    Filed: September 16, 2015
    Date of Patent: July 4, 2017
    Assignee: Foundation of Soongsil University-Industry Cooperation
    Inventors: Jaejin Lee, Seongkwon Jeong
  • Patent number: 9571306
    Abstract: A device for eliminating a channel effect is provided. A time-domain channel estimating unit generates a channel estimation result according to a first reference signal. A fast Fourier transform (FFT) unit performs FFT on the channel estimation result to generate a plurality of channel frequency responses corresponding to a plurality of frequency indices. An adjusting unit receives a plurality of input signals, and determines whether to adjust the input signal of each of the frequency indices according to the amplitude of the channel frequency response of each of the frequency indices to generate a set of adjusted signals. An inverse fast Fourier transform (IFFT) unit performs IFFT on a set of output signals associated with the set of adjusted signals to generate a feedback signal. The time-domain channel estimating unit further generates another channel estimation result according to a second reference signal and the feedback signal.
    Type: Grant
    Filed: August 6, 2015
    Date of Patent: February 14, 2017
    Assignee: MSTAR SEMICONDUCTOR, INC.
    Inventors: Yi-Ying Liao, Tai-Lai Tung
  • Patent number: 9565046
    Abstract: A method and transmitter for generating a multicarrier signal, to be transmitted to a receiver, are provided. The method comprises dividing symbols to be transmitted into protected symbols and non-protected symbols; precoding non-protected symbols in a first precoder; precoding protected symbols in a second precoder; creating a modified non-protected symbol vector, based on the precoded non-protected symbols and the precoded protected symbols; and modulating the modified non-protected symbol vector and the protected symbols, thereby generating the multicarrier signal. Also, a method and receiver are disclosed.
    Type: Grant
    Filed: October 12, 2015
    Date of Patent: February 7, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Jaap Van De Beek
  • Patent number: 9515861
    Abstract: A peak suppression apparatus includes an acquiring unit that acquires a first signal represented by an amplitude waveform of a multicarrier signal, a generator that generates a second signal represented by a waveform sequentially connecting a plurality of peak points adjacent to one another in the first signal as a peak detection signal for the multicarrier signal, a detector that detects a peak value and a peak timing of the multicarrier signal by using the peak detection signal, and a suppressing unit that suppresses a peak of the multicarrier signal based on the peak value and the peak timing.
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: December 6, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Tomoya Ota, Hiroyoshi Ishikawa, Kazuo Nagatani
  • Patent number: 9490858
    Abstract: An adjusting method for reducing local oscillation leakage or I/Q mismatch in a transmitter includes the steps of: (a) detecting a current extent of local oscillation leakage or I/Q mismatch; (b) determining if an adjusting direction is correct with reference to the current extent of local oscillation leakage or I/Q mismatch thus detected, maintaining the adjusting direction if correct, and reversing the adjusting direction upon determining that the adjusting direction is incorrect; and (c) adjusting a control signal according to the adjusting direction.
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: November 8, 2016
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventors: Hong-Ta Hsu, Ying-Hsi Lin
  • Patent number: 9425878
    Abstract: A base station is described herein which implements a method that uses different aspects of reported channel quality information (CQI) measurements to help select the “best” transmit antenna(s) on which to transmit control channel information to mobile terminal(s). The base station can also transmit a format indicator to communicate the assigned control channel transmit antenna(s) and the assigned data transmit antenna(s) to the mobile terminal(s).
    Type: Grant
    Filed: January 6, 2014
    Date of Patent: August 23, 2016
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Karl J. Molnar, David Astely, Tomas Sundin
  • Patent number: 9361706
    Abstract: The present disclosure relates generally to optical flow algorithms. Section 1 of the present disclosure describes an optical flow algorithm with real-time performance and adequate accuracy for embedded vision applications. This optical flow algorithm is based on a ridge estimator. Sections 2 and 3 describe an obstacle detection algorithm that utilizes the motion field that is output from the optical flow algorithm. Section 2 is focused on unmanned ground vehicles, whereas section 3 is focused on unmanned aerial vehicles.
    Type: Grant
    Filed: January 4, 2010
    Date of Patent: June 7, 2016
    Assignee: Brigham Young University
    Inventors: Dah-Jye Lee, Zhaoyi Wei
  • Patent number: 9350424
    Abstract: Systems and methods for implementing coexistence by requesting access to a channel in power line communications (PLC) are described. In an illustrative embodiment, a method performed by a PLC device, such as a PLC meter, may include detecting a communication from foreign PLC device on a PLC network in response to a foreign preamble received by the PLC device, determining whether a threshold back-off duration has been reached, and transmitting a channel access request in response to a determination that the threshold back-off duration has been reached.
    Type: Grant
    Filed: February 11, 2015
    Date of Patent: May 24, 2016
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Tarkesh Pande, Ramanuja Vedantham, Il Han Kim, Anand G. Dabak
  • Patent number: 9240813
    Abstract: Embodiments of a hybrid unit that supports a configurable number of radio units for a base station in a cellular communications network and embodiments of Distributed Digitally Convertible Radio Units (DDCRUs) for use with the hybrid unit are disclosed. In one embodiment, a hybrid unit for a base station in a cellular communications network is provided. The hybrid unit includes an analog hybrid matrix. The analog hybrid matrix includes a number of feeder ports operative to connect to at least one radio unit and up to a number of radio units that are external to and separate from the hybrid unit. In one preferred embodiment, the radio unit(s) is(are) DDCRU(s). The analog hybrid matrix also includes a number of antenna ports operative to connect to at least one and up to a corresponding number of antennas of the base station.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: January 19, 2016
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Neil McGowan, Marthinus Willem Da Silveira
  • Patent number: 9094906
    Abstract: According to exemplary embodiments of the invention, timing and frequency offset estimation is divided into two or more stages. In each stage, a different subset of the available reference symbols is selected to perform timing synchronization, frequency synchronization, or joint timing and frequency synchronization. In each non-final stage, a respective set of the reference symbols is used to perform timing synchronization or frequency synchronization in order to narrow the uncertainty window for the timing or frequency offset, and thus reduce the search space for the final stage. In the final stage, a different set of reference symbols may be used to perform joint timing and frequency synchronization over the reduced search space.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: July 28, 2015
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Jiann-Ching Guey, Jung-Fu Cheng, Havish Koorapaty
  • Patent number: 9025681
    Abstract: A plurality of training fields of a preamble of a physical layer data unit are generated, and training fields of the plurality of training fields are mapped to respective signal streams of a plurality of streams using a mapping matrix. A signal field of the preamble of the data unit is generated, and the signal field is mapped to the plurality of signal streams using a column of the mapping matrix. The plurality of signal streams are mapped to a plurality of spatial streams, and at least i) the plurality of training fields and ii) the signal field are transmitted via the plurality of spatial streams.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: May 5, 2015
    Assignee: Marvell World Trade Ltd.
    Inventors: Hongyuan Zhang, Sudhir Srinivasa
  • Patent number: 9008201
    Abstract: When a UE (12) is configured with MF-HSDPA and HARQ-ACK information associated with cells (14, 16) (characterized by potentially different downlink timing) is jointly encoded, only part of the existing Rel-9 HARQ-ACK codebook is reused. In one embodiment, only the codebook conflict arising from reuse of encodings is resolved. This is achieved by introducing a new codeword for at least one of the HARQ-ACK code words that are used multiple times in the existing Rel-9 codebook. In another embodiment, all codewords in the Rel-9 HARQ-ACK codebook having a Hamming distance smaller than a predetermined value (but not all codewords) are replaced. In yet another embodiment, all codewords in the Rel-9 HARQ-ACK codebook having a Hamming distance smaller than a predetermined value (but not all codewords) that would cause ambiguity at the NodeB receiver (i.e. where the interpretation of the HARQ-ACK information for one cell (14) depends on the number of streams transmitted at the other cell (16)) are replaced.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: April 14, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Johan Hultell, Peter von Wrycza
  • Patent number: 8953430
    Abstract: A method of inserting downlink demodulation Reference Signals into Resource Blocks of slots within Orthogonal Frequency Division Multiplexing (OFDM) frames at an OFDM transmitter forming part of an OFDM system, the transmitter having at least one antenna and the system having at least one transmission layer, includes the steps of: for each antenna, inserting cell-specific Reference Signals at sub-carriers indices evenly spaced by a fixed sub-carrier spacing; and selectively inserting UE-specific Reference Signals into nodes of a rectangular lattice formed from unused Resource Elements in a group of Resource Blocks of two consecutive slots, the nodes being located at the same sub-carrier indices as the cell-specific Reference Signals and further being equally spaced by a fixed number of symbol indices within the group of Resource Blocks.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: February 10, 2015
    Assignee: NEC Corporation
    Inventor: Duong Pham
  • Patent number: 8908784
    Abstract: Data may be transmitted from a RAN node to a wireless terminal using a MIMO antenna array. A plurality of unmapped symbol blocks may be generated. Symbols of a first one of the plurality of unmapped symbol blocks may be mapped to first and second mapped symbol blocks so that the first mapped symbol block includes symbols of the first unmapped symbol block and so that the second mapped symbol block includes symbols of the first unmapped symbol block. The symbols of the first and second mapped symbol blocks may be precoded to provide precoded symbols of respective first and second MIMO precoding layers using a MIMO precoding vector. Each of the precoded symbols of the first and second MIMO precoding layers may be transmitted through the MIMO antenna array to the wireless terminal using a same TFRE. Related devices and terminals are also discussed.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: December 9, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Sairamesh Nammi, Bo Göransson, Erik Larsson
  • Patent number: 8873686
    Abstract: A system including a first receiver that generates a first set of decoded codewords; and a first canceller that cancels, in response to any decoded codeword of the first set of decoded codewords failing CRC and a first decoded codeword from the first set of decoded codewords passing CRC, interference of a first codeword on a second set of codewords which includes the plurality of codewords and excludes the first codeword. The system further includes a second receiver that generates a third set of decoded codewords by decoding the second set of codewords; and a second canceller that cancels, in response to any decoded codeword of the third set of decoded codewords failing CRC and a second decoded codeword from the third set of decoded codewords passing CRC, interference of a second codeword on a fourth set of codewords.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: October 28, 2014
    Assignee: Marvell International Ltd.
    Inventors: Jungwon Lee, Yakun Sun, Jiwoong Choi, Leilei Song, Adina Matache
  • Patent number: 8867332
    Abstract: An apparatus for data transmission in a multi-antenna system is provided. The apparatus includes: a modulation mapper for modulating codewords into modulation symbols that express a position on a signal constellation; a layer permutator for mapping the modulation symbols to different layers; a transform precoder for generating a discrete Fourier transform (DFT) symbol of a frequency domain by performing DFT on the modulation symbol mapped to the layer; a resource element mapper for mapping the DFT symbol to a physical resource element; and a signal generator for generating a single carrier-frequency division multiple access (SC-FDMA) signal from the DFT symbol mapped to the resource element, wherein a modulation order of the modulation symbols is determined depending on the layer mapped by the layer permutator.
    Type: Grant
    Filed: February 16, 2010
    Date of Patent: October 21, 2014
    Assignee: LG Electronics Inc.
    Inventors: Hyun Soo Ko, Jae Hoon Chung, Seung Hee Han, Moon Il Lee
  • Patent number: 8867329
    Abstract: In one embodiment, a transmitting device may determine a first data frame to a first destination and a second data frame to a second destination, and may assign subcarriers in a non-overlapping arrangement to the first and second data frames. Once assigned, the transmitting device may augment a transmission physical (PHY) header with a destination and tone map tuple for each of the first and second destinations, and transmits the transmission with the first and second data frames simultaneously on the assigned subcarriers.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: October 21, 2014
    Assignee: Cisco Technology, Inc.
    Inventors: Jonathan W. Hui, Jean-Philippe Vasseur, Wei Hong
  • Publication number: 20140307535
    Abstract: The present invention relates to digital data communication and provides an efficient method for generating multi-dimensional constellations for digital data modulation with a high degree of modulation diversity, a method for transmitting and receiving data on the basis of such constellations, and a corresponding apparatus. This is achieved by considering only multi-dimensional rotation matrices with all elements on the diagonal having the same first absolute value and all other elements having the same second absolute value. In this manner, multi-dimensional rotation matrices can be generated having only a single independent parameter and a structure that is as regular as possible. The independent parameter can be configured in order to minimize the error probability for various constellation sizes.
    Type: Application
    Filed: June 11, 2014
    Publication date: October 16, 2014
    Inventors: Mihail PETROV, Tomohiro KIMURA
  • Patent number: 8811403
    Abstract: Systems and methods for concatenating messages in MoCA devices that are connected via a coax network are provided. One embodiment of a system according to the invention includes a home network having a plurality of nodes. The network is implemented over coaxial cable. The network includes a plurality of networked nodes. A transmitter of at least one of the networked nodes is configurable to transmit a concatenated burst. The concatenated burst includes a preamble, a first payload frame and a second payload frame. The first payload frame and the second payload frame are separated by a cyclic prefix of a first symbol of the second payload frame.
    Type: Grant
    Filed: July 2, 2012
    Date of Patent: August 19, 2014
    Assignee: Broadcom Corporation
    Inventors: Avraham Kliger, Philippe Klein, Yitshak Ohana
  • Patent number: 8811143
    Abstract: A digital processing unit for use in a spread spectrum signal receiver, the digital processing unit being adapted to receive an incoming stream of data samples and in response thereto produce a decoded signal, the digital processing unit comprising a correlation module adapted to correlate data blocks formed from the incoming stream of data samples with a local code replica segment to produce a first number of intermediate accumulation results and an aggregation module adapted to receive the first number of intermediate accumulation results and to combine the first number of consecutive ones of said intermediate accumulation results to form a target number of aggregated accumulation results, said target number being less than or equal to the first number.
    Type: Grant
    Filed: November 3, 2010
    Date of Patent: August 19, 2014
    Assignee: NordNav Technologies AB
    Inventors: Christian Stahlberg, Per-Ludvig Normark
  • Patent number: 8792324
    Abstract: The present invention relates to digital data communication and provides an efficient method for generating multi-dimensional constellations for digital data modulation with a high degree of modulation diversity, a method for transmitting and receiving data on the basis of such constellations, and a corresponding apparatus. This is achieved by considering only multi-dimensional rotation matrices with all elements on the diagonal having the same first absolute value and all other elements having the same non-zero second absolute value. In this manner, multi-dimensional rotation matrices can be generated having only a single independent parameter and a structure that is as regular as possible. The independent parameter can be configured in order to minimize the error probability for various constellation sizes.
    Type: Grant
    Filed: August 17, 2010
    Date of Patent: July 29, 2014
    Assignee: Panasonic Corporation
    Inventors: Mihail Petrov, Tomohiro Kimura
  • Patent number: 8792325
    Abstract: A system includes a mapping device. The mapping device groups encoded bits of OFDM symbols into first groups. For each of the first groups, the mapping device maps adjacent bits onto non-adjacent subcarriers of multiple subcarriers and in an alternating manner onto bits of a signal constellation such that: every other one of the adjacent bits are mapped to first bits on the signal constellation; and bits other than the every other one of the adjacent bits are mapped to second bits on the signal constellation. Each of the first groups has a corresponding complex number. The mapping device: groups predetermined numbers of the first groups into second groups, where each of the second groups corresponds to one of the OFDM symbols; and maps each of the second groups to one of the multiple subcarriers such that the multiple subcarriers are modulated based on the complex numbers.
    Type: Grant
    Filed: July 15, 2013
    Date of Patent: July 29, 2014
    Assignee: Marvell International Ltd.
    Inventor: Ravi Narasimhan
  • Patent number: 8780841
    Abstract: A method and apparatus for reconfiguring a user equipment configured for multi-carrier operation from a first downlink control information set to a second downlink control information set while carrier aggregation is being used, including receiving a physical downlink control channel with downlink control information formats containing a carrier indicator field.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: July 15, 2014
    Assignee: BlackBerry Limited
    Inventors: Andrew Mark Earnshaw, Youn Hyoung Heo, Zhijun Cai, Mo-Han Fong, Hua Xu
  • Patent number: 8760993
    Abstract: In a method and a transmitter data is transmitted to two mobile stations sharing the same frequency band and the same timeslot. The data is modulated using a quaternary symbol constellation. Further, the data is transmitted to two mobile stations multiplexed on a shared channel comprising two branches and the transmission power for the transmitted data is set in response to the relative gain of the two branches. Hereby, the total system interference is reduced. The method and transmitter further allows for a cellular radio system individual power control loops for the two sub-channels when the system uses MUROS.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: June 24, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Miguel Lopez, Tomas Andersson, Benny Lennartson
  • Patent number: 8730789
    Abstract: A physical layer module includes a mapping module and a plurality of gain modules. The mapping module maps a plurality of coded data streams to a plurality of transmit antennas, in which each transmit antenna is associated with a respective radio frequency channel of a plurality of radio frequency channels. Each gain module is associated with a respective radio frequency channel of the plurality of radio frequency channels, and is configured to apply a complex gain to the coded data stream mapped to the respective radio frequency channel associated with the gain module. The complex gain applied by the gain module differs relative to that applied by other gain modules, and corresponds to the transmit antenna associated with the respective radio frequency channel.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: May 20, 2014
    Assignee: Marvell International Ltd.
    Inventors: Jungwon Lee, Hui-Ling Lou
  • Patent number: 8724464
    Abstract: Aspects of a method and system for near continuous data rate limit adjustment via a plurality of link variables in an energy efficient network. In this regard, power consumption of a network device may be controlled by enabling and/or disabling one or more components in the network device based on an adjustment of a plurality of data rate variables that control a data rate limit at which the network device may communicate. Exemplary data rate variables may comprise a number of active channels of a network link over which the network device communicates, a symbol rate on an Ethernet link over which said network device communicates, an inter-frame gap time on an Ethernet link over which said network device communicates, a signal constellation utilized for representing signals on an Ethernet link over which said network device communicates.
    Type: Grant
    Filed: October 1, 2008
    Date of Patent: May 13, 2014
    Assignee: Broadcom Corporation
    Inventor: Wael William Diab
  • Patent number: 8687751
    Abstract: A system including a first receiver module and a first interference canceller module. The first receiver module generates a first set of decoded codewords by decoding codewords in a received signal and determines if any of the first set of decoded codewords fails cyclic redundancy check (CRC). The first interference canceller module generates a second signal based on a first decoded codeword from the first set of decoded codewords when (i) any of the first set of decoded codewords fails CRC and (ii) the first decoded codeword passes CRC. By subtracting the second signal from the first signal, the first interference canceller module (i) cancels interference of a first codeword, which corresponds to the first decoded codeword, on a second set of codewords, which includes the plurality of codewords and excludes the first codeword and (ii) generates a third signal, which includes the second set of codewords.
    Type: Grant
    Filed: March 14, 2011
    Date of Patent: April 1, 2014
    Assignee: Marvell International Ltd.
    Inventors: Jungwon Lee, Yakun Sun, Jiwoong Choi, Leilie Song, Adina Matache
  • Patent number: 8659987
    Abstract: In one embodiment of a communications network, the predetermined encoding scheme and symbol constellation configurations are chosen so that the range in channel qualities that the encoding scheme and symbol constellation configurations are designed to be utilized within overlap with each other. This overlapping provides hysteresis, which reduces the frequency with which a subscriber must alter encoding scheme and symbol constellations. Reducing the frequency of changing encoding scheme and/or symbol constellation eliminates the communication overhead associated with these changes and increases throughput by enabling the subscriber to spend more time transmitting data.
    Type: Grant
    Filed: August 9, 2011
    Date of Patent: February 25, 2014
    Assignee: Broadcom Corporation
    Inventor: David L. Hartman, Jr.
  • Patent number: 8660199
    Abstract: To demodulate a quadrature amplitude modulation (QAM) signal, a reception point is determined corresponding to a symbol in the QAM signal that is received where the symbol is mapped to one reference point of a plurality of reference points in a rotated constellation and the plurality of reference points are represented by an in-phase (I) coordinate and a quadrature-phase (Q) coordinate. A plurality of candidate points corresponding to a portion of the plurality of reference points are selected based on distances between the reception point and the respective reference points. The reception point is demapped by calculating a plurality of log-likelihood ratios based on the plurality of candidate points, the plurality of log-likelihood ratios corresponding to bits of data represented by the reception point.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: February 25, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Myeong-Cheol Shin
  • Patent number: 8638654
    Abstract: A method for transmitting a downlink control channel in a mobile communication system and a method for mapping the control channel to physical resources using a block interleaver are provided. In order to transmit a downlink control channel in a mobile communication system, information bits are modulated to generate one or more modulation symbols according to a specific modulation scheme, the modulation symbols are interleaved using a block interleaver, and the interleaved modulated symbols are mapped to resource elements allocated for transmission of at least one control channel in a subframe, thereby transmitting the at least one control channel.
    Type: Grant
    Filed: July 20, 2012
    Date of Patent: January 28, 2014
    Assignee: LG Electronics Inc.
    Inventors: So Yeon Kim, Young Woo Yun, Ki Jun Kim, Moon Il Lee, Hyun Soo Ko, Jae Hoon Chung, Ji Ae Seok, Seung Hyun Kang, Suk Hyon Yoon, Joon Kui Ahn
  • Patent number: 8509351
    Abstract: The present disclosure relates to multi-mode RF circuitry using a single IQ modulator topology that may support different communication standards, including enhanced data rates for global system for mobile communications evolution (EDGE) and EDGE evolution by dividing certain modulation functions between a frequency synthesizer and an IQ modulator. Specifically, during a standard modulation mode, which may be used to support many communications standards, the frequency synthesizer provides an un-modulated RF carrier signal to the IQ modulator, which either phase modulates or phase and amplitude modulates the un-modulated RF carrier signal to provide a standard modulated RF signal.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: August 13, 2013
    Assignee: RF Micro Devices, Inc.
    Inventors: Nadim Khlat, Alexander Wayne Hietala, Marcus Granger-Jones
  • Patent number: 8462866
    Abstract: A method of transmitting data symbols via an Orthogonal Frequency Division Multiplexed (OFDM) symbols that includes forming data symbols into pairs and generating a first pair of modulation symbols for each of the pairs of data symbols, where the first pair of modulation symbols form first and second modulation symbols of an Alamouti cell. The method further includes forming a first version of the OFDM symbols by modulating the sub-carriers allocated for carrying the data with the first and second modulation symbols of the Alamouti cells, and modulating the one or more pilot carriers of the first version of the OFDM symbol according to a predetermined pattern.
    Type: Grant
    Filed: March 1, 2012
    Date of Patent: June 11, 2013
    Assignee: Sony Corporation
    Inventors: Lothar Stadelmeier, Dietmar Schill, Daniel Schneider
  • Patent number: 8412125
    Abstract: An apparatus for enabling a base station to transmit radio frequency signals with a transmit diversity technique comprises a first antenna implemented in the base station; and a second antenna implemented in the base station, and placed apart from the first antenna by a predetermined distance. The first antenna utilizes a first frequency band of a predetermined frequency spectrum for transmitting signals, and the second antenna utilizes a second frequency band of the predetermined frequency spectrum for transmitting signals. The first and second frequency bands do not overlap.
    Type: Grant
    Filed: October 3, 2007
    Date of Patent: April 2, 2013
    Assignee: Cisco Technology, Inc.
    Inventor: Richard L. Smith
  • Patent number: 8396034
    Abstract: A method of determining a cell identity in a wireless communication system is disclosed. The present invention includes the steps of obtaining a segment ID and a sequence index from an SA-preamble (secondary advanced preamble) sequence received from a base station and determining the cell identity using the segment ID and the sequence index. In this case, the cell identity corresponds to one SA-preamble sequence and a cell identity adjacent to the cell identity corresponds to an SA-preamble sequence having a complex conjugate relation of the one SA-preamble sequence.
    Type: Grant
    Filed: June 18, 2010
    Date of Patent: March 12, 2013
    Assignee: LG Electronics Inc.
    Inventors: Jin Soo Choi, Han Gyu Cho, Jin Sam Kwak
  • Patent number: 8379769
    Abstract: A communication system utilizing a hierarchically modulated signal and method thereof are provided, wherein a receiver system is configured to receive a hierarchically modulated signal. The receiver system includes a receiver device configured to receive the hierarchically modulated signal, which is a function of a time domain, and including a high priority data stream that has a single carrier type modulation, and a low priority data stream having data bits that are spread over a plurality of data symbols of a high priority data modulation. The receiver system further includes a low priority processor device, which includes an OFDM decoder configured to convert the low priority data stream of the hierarchically modulated signal that is a function of the time domain to be a function of a frequency domain by utilizing a FFT, such that an output is emitted that is representative of the low priority data stream.
    Type: Grant
    Filed: March 10, 2010
    Date of Patent: February 19, 2013
    Assignee: Delphi Technologies, Inc.
    Inventor: Glenn A. Walker
  • Patent number: 8379581
    Abstract: A method for uplink power control is described. A user equipment (UE) power class may be determined. An uplink multiple access scheme may also be determined. The maximum transmission power for the UE may further be determined according to the determined uplink multiple access scheme and the UE power class.
    Type: Grant
    Filed: December 8, 2008
    Date of Patent: February 19, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Kimihiko Imamura
  • Patent number: 8374073
    Abstract: A modulator and a modulation method for a communication device are disclosed. The modulator is configured to multiplex control symbols and data symbols for transmission in a signal based on information of the distance between the positions of at least two control symbols in a representation of symbol positions in the signal.
    Type: Grant
    Filed: April 22, 2008
    Date of Patent: February 12, 2013
    Assignee: Nokia Siemens Networks Oy
    Inventors: Zhenhong Li, Kari Pekka Pajukoski, Esa Tapani Tiirola
  • Patent number: 8335152
    Abstract: When transmitting data from a transmission unit to a reception unit over a channel in a wireless communication system, it has been observed that there are inherent losses in throughput, especially for a channel experiencing high channel quality variations over its frequency range. To improve the throughput over such a channel, it is proposed to: estimate the quality of each subchannel of a channel. classify the subchannels into a number of quality groups based on the estimated quality, and select a code rate per quality group. This selected code rate per quality group is then used when a data word to be transmitted is coded. Simulations have shown that by grouping the subchannels into a limited number of groups, for example one to four groups depending on the channel quality variation, a high throughput could be achieved with a minimum of signaling cost in the form of extra overhead.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: December 18, 2012
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Lei Wan, Johan Axnäs
  • Patent number: 8279955
    Abstract: In accordance with the teachings described herein, systems and methods are provided for calibrating DC offset in a receiver. A DC calibration circuit may be used that is configured to receive a digital multi-carrier modulated (MCM) signal that includes a sequence of MCM symbols. The DC calibration circuit may include an accumulator and a compensator. The accumulator may be used to determine an estimated DC offset of a current MCM symbol in the sequence of MCM symbols. The compensator may be used to remove the estimated DC offset from a next MCM symbol in the sequence of MCM symbols. The accumulator may also be used to receive a plurality of digital samples that comprise the current MCM symbol and to determine the estimated DC offset by calculating an average of the plurality of digital samples.
    Type: Grant
    Filed: January 14, 2009
    Date of Patent: October 2, 2012
    Assignee: Marvell International Ltd.
    Inventors: Qing Zhao, Souvik Dihidar, Leilei Song, Jungwon Lee