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| Application No. | Application Title | Issue Date |
| 20120014470 | QUADRATURE MODULATOR WITH FEEDBACK CONTROL AND OPTICAL COMMUNICATIONS SYSTEM USING THE SAME The method and system are disclosed for automatic feedback control of integrated optical quadrature modulator for generation of optical quaternary phase-shift-keyed signal in coherent optical communications. The method comprises the steps of detecting at least a part of... | 01/19/2012 |
| 20120014274 | BASE STATION, WIRELESS COMMUNICATION SYSTEM, METHOD FOR CONTROLLING BASE STATION, WIRELESS COMMUNICATION METHOD, CONTROL PROGRAM, AND MOBILE STATION [Problem] The number of the base stations that are activated uselessly cannot be sufficiently reduced even in a light traffic state. As a result, interference between adjacent cells and power consumption cannot be sufficiently reduced. [Mea... | 01/19/2012 |
| 20110317781 | TRANSMITTER, RECEIVER, DATA TRANSMISSION METHOD AND DATA RECEPTION METHOD A method is provided which improves reliability of channel estimation in a digital communication system by reducing the ambiguity in the recognition of received symbols evaluated for the channel estimation. A data word transmitted according to a first mapping of data wo... | 12/29/2011 |
| 20110228869 | DESIGN METHODOLOGY AND METHOD AND APPARTUS 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... | 09/22/2011 |
| 20110206156 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING DATA IN WIRELESS COMMUNICATION SYSTEM A method for transmitting, by a transmitting terminal, data to a receiving terminal in a wireless communication system includes: generating a first detection field including symbols modulated by using a BPSK data tone; generating a second detection field including symbo... | 08/25/2011 |
| 20110150110 | Tone Count Selection A tone selection module selects tones suitable for use in an orthogonal frequency division multiplexing (OFDM) data transmission device based on several constraints. These constraints include number of available tones, modulation type, and code rate. The OFDM device may... | 06/23/2011 |
| 20110110443 | DATA RECEIVING APPARATUS FOR RECEIVING DATA FRAME USING CONSTELLATION MAPPING SCHEME AND DATA TRANSMISSION APPARATUS FOR TRANSMITTING THE DATA FRAME Disclosed are a data receiving apparatus that may discriminate a type of a received data frame, and a data transmission apparatus that may apply a constellation mapping scheme to a data frame so that a data receiving apparatus may discriminate the data frame in accordan... | 05/12/2011 |
| 20110085479 | ENCODING UPLINK ACKNOWLEDGMENTS TO DOWNLINK TRANSMISSIONS A portable device, such as a mobile terminal or user equipment, for encoding uplink acknowledgments to downlink transmissions. The portable device includes a receiver configured to receive a plurality of data blocks, such that each of the data blocks include an associat... | 04/14/2011 |
| 20100260281 | JOINT CHANNEL ESTIMATION AND MODULATION DETECTION A receiver comprises a demodulator to estimate channel impulse response and timing synchronization information for the received signal and to select a modulation technique for demodulating the received signal; and a channel decoder to produce a binary sequence from the ... | 10/14/2010 |
| 20100202785 | QUADRATURE AMPLITUDE MODULATION SIGNAL GENERATING DEVICE A quadrature amplitude modulation (QAM) signal generator, which can obtain optical signals such as QAM signals without handling multilevel electrical signals, can be produced by using a plurality of parallel Mach-Zehnder modulators (MZMs), such as quadruplex parallel MZ... | 08/12/2010 |
| 20100150261 | WIRELESS COMMUNICATION SYSTEM USING SELECTIVE MAPPING FOR MEMORY-LESS DEMODULATION AND RELATED METHODS A wireless communication system may include a first wireless communications device, and a second wireless communications device. The first wireless communications device may include a wireless transmitter, and a modulator coupled to the wireless transmitter for modulati... | 06/17/2010 |
| 20100080569 | METHOD AND APPARATUS FOR GENERATING DQPSK ENCODING OPTICAL SIGNAL A method and an apparatus for generating a differential quadrature phase shift keying (DQPSK) code optical signal are provided. The method may includes splitting an optical signal to obtain two polarized optical signals, modulating and phase-shifting one of the two pola... | 04/01/2010 |
| 20100067606 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING MBMS BASED ON HM The present invention relates to a communication field and particularly to a method and apparatus for transmitting/receiving multimedia broadcast/multicast data based on hierarchical modulation in order to solve the problem of low efficiency of conventional methods. The... | 03/18/2010 |
| 20100034186 | PEAK-TO-AVERAGE POWER RATIO (PAPR) REDUCTION SCHEME FOR WIRELESS COMMUNICATION Techniques for sending a transmission in a manner to reduce peak-to-average power ratio (PAPR) of the transmission are described. A transmitter may select phases for a plurality of resource blocks based on a metric, e.g., PAPR. The transmitter may apply the selected pha... | 02/11/2010 |
| 20100027706 | SIGNAL TRANSMISSION SYSTEM A signal transmitter apparatus generates three phase-shifted signals by shifting three transmission signals by predetermined phase shift amounts so that the phase shift amounts of the transmission signals are different from each other by 120 degrees. The signal transmit... | 02/04/2010 |
| 20090285155 | SYSTEMS AND METHODS FOR TRANSMITTING AND RECEIVING ADDITIONAL DATA OVER LEGACY SATELLITE DIGITAL AUDIO RADIO SIGNALS Systems and methods for transmitting and receiving additional data, such as video data, over legacy satellite digital audio radio signals are provided. In exemplary embodiments, hierarchical modulation can be used to transmit secondary information over a legacy signal. ... | 11/19/2009 |
| 20090034645 | SYSTEM AND METHOD FOR GAIN WEIGHTED CODE COMBINING FOR TWO BINARY PHASE SHIFT KEYING CODES A method and system for generating a composite binary phase shift keying (BPSK) code from two independent component BPSK codes that is representative of the two component BPSK codes. In one implementation the method involves gain weighting each of the first and second c... | 02/05/2009 |
| 20070230610 | Apparatus for performing alternating quadratures differential binary phase shift keying modulation and demodulation Methods, apparatus, and systems for alternating quadratures differential binary phase shift keying (AQDBPSK) modulation and demodulation radically increase overall energy efficiency of a communication system due to the combined effect of efficient utilization of transmi... | 10/04/2007 |
| 20070223616 | Radio Communication Apparatus and Radio Communication System A radio communication apparatus that can more precisely grasp, in a case of using a plurality of antenna elements to receive radio signals, the reception qualities of the respective antenna elements to improve the error rate of received signals. In the apparatus, a lowe... | 09/27/2007 |
| 20070217541 | Compress-forward Coding with N-PSK Modulation for the Half-duplex Gaussian Relay Channel Systems and methods that implement compress-forward (CF) coding with N-PSK modulation for the relay channel are disclosed, where N is greater than or equal to two. In the CF scheme, Wyner-Ziv coding is applied at the relay to exploit the joint statistics between signals... | 09/20/2007 |
| 20070177689 | METHOD AND APPARATUS FOR SUB SAMPLE-PER-SYMBOL DEMODULATOR FOR A SPECTRALLY EFFICIENT WAVEFORM WITH AN LPI FEATURE An apparatus and method for transmitting and receiving a communication signal includes selecting a pulse shape for a continuous phase modulated waveform, encoding specific information into the waveform to form a communication signal and transmitting the communication si... | 08/02/2007 |
| 20070165742 | Method for enhancing bluetooth transmission speed and robustness of emitting end and receiving end of communication system A method for enhancing the Bluetooth transmission speed and robustness of an emitting end and a receiving end is provided. The method is utilized in a system having an emitting end and a receiving end, wherein at least one of the emitting and receiving ends is provided ... | 07/19/2007 |
| 20070058747 | Phase shifter and current mode mixer An integrated circuit radio transceiver comprises an integrated phase shift mixer for generating a phase and frequency shifted output signal to at least a portion of one of a transmitter or receiver front end. The integrated phase shift mixer includes a phase shift bloc... | 03/15/2007 |
| 20070001817 | PHASE MODULATION APPARATUS, RFID TAG, READER/WRITER AND PHASE MODULATION METHOD A phase modulation apparatus includes a pattern-generating part that generates a phase-modulated pattern of a carrier wave, the carrier wave being phase-modulated by send data, and a phase-transition controlling part that transitions the phase of the pattern generated i... | 01/04/2007 |
| 20060209982 | Coded digital modulation method for communication system A new class of 16-ary Amplitude and Phase Shift Keying (APSK) coded modulations, called double-ring APSK modulation, based on an amplitude and phase shift keying constellation in which the locations of the digital signals to be encoded are placed on two concentric rings... | 09/21/2006 |
| 20060209981 | Systems and methods for high-efficiency transmission of information through narrowband channels Systems and methods for transmitting information at very high data rates through narrowband communication channels are provided. The systems and methods involve modulating a message signal with a novel return-to-zero, abrupt phase modulation technique and filtering the ... | 09/21/2006 |
| 20060133533 | Method and apparatus for using multiple modulation schemes for a single packet Techniques for using multiple modulation schemes for a single packet are described. Each data packet is processed and transmitted in up to T blocks, where T>1. Multiple modulation schemes are used for the T blocks to achieve good performance. A transmitter encodes a dat... | 06/22/2006 |
| 20060136975 | Radio communication apparatus A radio communication apparatus capable of switching modulation schemes includes a QPSK modulation signal generator configured to modulate transmission data by a QPSK modulation scheme and to output a QPSK modulation signal. A 64QAM modulation signal generator is config... | 06/22/2006 |
| 20060133532 | Hardware efficient FSK demodulator A radio frequency (RF) transmitter includes a digital radio processor and a baseband processor. A complex analog-to-digital converter (ADC) within the radio processor provides an analog interface to the baseband processor to receive an analog complex modulated baseband ... | 06/22/2006 |
| 20060098755 | Systems and methods for high-efficiency transmission of information through narrowband channels Systems and methods for transmitting information at very high data rates through narrowband communication channels are provided. The systems and methods involve modulating a message signal with a novel return-to-zero, abrupt phase modulation technique and filtering the ... | 05/11/2006 |
| 20060045202 | Matching I and Q portions of a device In one embodiment, the present invention includes a frequency divider that has an I channel to provide an I channel phase; and a Q channel to provide a Q channel phase, in which the I and the Q channels are mirrored with respect to an axis therebetween. The axis may als... | 03/02/2006 |
| 20050117669 | Method to increase performance of secondary data in a hierarchical modulation scheme The present invention provides a receiver for use in a SDAR system, the receiver including a receiving unit having satellite signal detection means for detecting a transmit signal transmitted from a satellite, the transmit signal produced when the transmitter modulates ... | 06/02/2005 |
| 20050100112 | Mobile body communication apparatus When communications of the same data are performed using a multi-carrier modulation method between a plurality of base stations and a mobile station at the same time and with the same frequency, a standing wave interference is generated to lower the carrier electric fie... | 05/12/2005 |
