Patent application number | Description | Published |
20080285687 | APPARATUS, AND ASSOCIATED METHOD, FOR DETECTING VALUES OF A SPACE-TIME BLOCK CODE USING SELECTIVE DECISION-FEEDBACK DETECTION - A selective decision-feedback detector for the space-time block code which provides both diversity and spatial multiplexing. To detect a received code block of transmitted symbols, the channel matrix is properly preprocessed with the real and imaginary parts decoupled, and the selective decision-feedback detector makes multiple decisions on the same block upon differently permuted channel matrix and generates multiple candidates for the results. The indicators of the decision errors associated with the candidates are compared, and one of the candidates with the minimum error is selected by a selector as the decided symbols to be used for further processing at a receiving station. | 11-20-2008 |
20090129312 | System and Method for Timing Synchronization - The present disclosure relates generally to systems and methods for timing synchronization. Uplink synchronization is a necessary component of a UE operating in a mobile, wireless network. Reliable uplink synchronization generally requires regular uplink transmission containing reference signals. A method is provided that defines a burst period for sending the reference signals, determines an interval between the reference signals, and sends a timing instruction message that includes the burst period and the determined interval. A second method is provided that receives the timing instruction message and sends the reference signals in accordance with the timing instruction. | 05-21-2009 |
20090316828 | APPARATUS, AND ASSOCIATED METHOD OF PHASE-OFFSET MODULATION, FOR SPACE-TIME CODED WIRELESS COMMUNICATION SYSTEMS - An apparatus, and an associated methodology, for facilitating communication of data in a wireless communication systems. Binary data are modulated to form modulated symbols on parallel paths. The symbols formed on one of the parallel paths are phase-offset by a phase rotator to form phase-offset symbols. The parallel paths of symbols provide the symbols, both the phase-offset symbols and the symbols that are not phase-offset, to an Alamouti encoder. As a result, the dynamic range of the transmitted RF signals is reduced due to the introduction of the phase offset between the symbols of the parallel paths applied to the Alamouti encoder. | 12-24-2009 |
20100040170 | SYSTEMS AND METHODS FOR COMMUNICATING USING ASK OR QAM WITH UNEVEN SYMBOL CONSTELLATION - Systems and methods of performing ASK or QAM modulation with uneven distance between symbols are provided. Different bit positions mapped to such symbols are assigned to different receivers, with the result that there are different BER performances among bits sent from a transmitter to the different receivers. | 02-18-2010 |
20100040171 | SYSTEMS AND METHODS FOR COMMUNICATING USING ASK OR QAM WITH UNEVEN SYMBOL CONSTELLATION - Systems and methods of performing ASK or QAM modulation with uneven distance between symbols are provided. These are used to provide differing BER performances among bits sent from a transmitter to a receiver. | 02-18-2010 |
20110019777 | APPARATUS, AND ASSOCIATED METHOD, FOR DETECTING VALUES OF A SPACE-TIME BLOCK CODE USING SELECTIVE DECISION-FEEDBACK DETECTION - A selective decision-feedback detector for the space-time block code which provides both diversity and spatial multiplexing. To detect a received code block of transmitted symbols, the channel matrix is properly preprocessed with the real and imaginary parts decoupled, and the selective decision-feedback detector makes multiple decisions on the same block upon differently permuted channel matrix and generates multiple candidates for the results. The indicators of the decision errors associated with the candidates are compared, and one of the candidates with the minimum error is selected by a selector as the decided symbols to be used for further processing at a receiving station. | 01-27-2011 |
20110096866 | APPARATUS, AND ASSOCIATED METHOD, FOR COMMUNICATING A DATA BLOCK IN A MULTI CARRIER MODULATION COMMUNICATION SCHEME TOGETHER WITH AN IDENTIFICATION SEQUENCE SUPERIMPOSED THEREON - Apparatus, and an associated method, for facilitating communication of a data block communicated in an OFDM-based, communication system. Side-information required to be transmitted by many PAPR reduction schemes in OFDM is carried and transmitted by sending orthogonal binary sequences superimposed on the OFDM data sequence carrying the information to be transmitted. In one embodiment, a selected scrambling sequence is multiplied with an input data block to yield a desired Peak-To-Average Power Ratio. An identification sequence one-to-one corresponding to the scrambling sequence is superimposed on the resultant sequence and transmitted together. In the receiving station, the identification sequence is determined through correlation operations. This also determines the scrambling sequence. The effects of both sequences are finally removed from the information-carrying data sequence. | 04-28-2011 |
20110182342 | APPARATUS, AND ASSOCIATED METHOD, FOR COMMUNICATING A DATA BLOCK IN A MULTI CARRIER MODULATION COMMUNICATION SCHEME - Apparatus, and an associated method, for sending a data block in an OFDM, or other MCM, communication system with reduced PAPR is provided. The data block is combined with a random scrambling sequence. An IDFT operation is performed upon the combined sequence, and its PAPR, peak-to-average power ratio, is calculated. The PAPR is compared against a threshold. If the PAPR is smaller than a threshold, the transformed, combination sequence is transmitted. Otherwise, a different scrambling sequence, if available, is used to form a new combination sequence, and the process iterates until either a PAPR smaller than the threshold is obtained, or a pre-defined maximum number of iterations is reached. If the maximum number of iterations is reached and no combination sequence is created that leads to an acceptable PAPR, then the transformed, combination sequence that exhibits the smallest PAPR level is selected for transmission. | 07-28-2011 |
20110280220 | System and Method for Timing Synchronization - A method in a network access equipment is provided. The method includes defining a burst duration for sending a plurality of reference signals. The method further includes determining an interval between ones of the plurality of reference signals in the burst duration. The method further includes defining a burst period for sending a plurality of reference signal bursts. The method further includes sending a reference signal instruction message containing an activation message and at least one of the burst duration, the interval, and the burst period. | 11-17-2011 |
20110280238 | ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING (OFDM) COMMUNICATION SLOT STRUCTURES AND METHODS - Improved orthogonal frequency-division multiplexing (OFDM) communication slot structures and method are described. One example method includes converting a first portion of a set of bits to a first orthogonal frequency-division multiplexing symbol to be transmitted during a first portion of a time-division multiple access time slot, and converting a second portion of the set of bits to a second orthogonal frequency-division multiplexing symbol to be transmitted during a second portion of the time-division multiple access time slot. Other embodiments are shown and described. | 11-17-2011 |
20110310861 | System and Method for Timing Synchronization - The present disclosure relates generally to systems and methods for timing synchronization. Uplink synchronization is a necessary component of a UE operating in a mobile, wireless network. Reliable uplink synchronization generally requires regular uplink transmission containing reference signals. A method is provided that defines a burst period for sending the reference signals, determines an interval between the reference signals, and sends a timing instruction message that includes the burst period and the determined interval. A second method is provided that receives the timing instruction message and sends the reference signals in accordance with the timing instruction. | 12-22-2011 |
20120257663 | APPARATUS, AND ASSOCIATED METHOD, FOR COMMUNICATING A DATA BLOCK IN A MULTI CARRIER MODULATION COMMUNICATION SCHEME - Apparatus, and an associated method, for sending a data block in an OFDM, or other MCM, communication system with reduced PAPR is provided. The data block is combined with a random scrambling sequence. An IDFT operation is performed upon the combined sequence, and its PAPR, peak-to-average power ratio, is calculated. The PAPR is compared against a threshold. If the PAPR is smaller than a threshold, the transformed, combination sequence is transmitted. Otherwise, a different scrambling sequence, if available, is used to form a new combination sequence, and the process iterates until either a PAPR smaller than the threshold is obtained, or a pre-defined maximum number of iterations is reached. If the maximum number of iterations is reached and no combination sequence is created that leads to an acceptable PAPR, then the transformed, combination sequence that exhibits the smallest PAPR level is selected for transmission. | 10-11-2012 |
20130034054 | METHOD AND SYSTEM FOR FORMATTING CYCLIC PREFIX/POSTFIX IN A MOBILE COMMUNICATION SYSTEM - A method and transmitter, the method generating a burst containing a first data portion and a second data portion surrounding a training sequence; and appending to the burst a cyclic prefix and a cyclic postfix. Further a receiver on a network element, the receiver configured to: receive a burst containing a cyclic prefix, a cyclic postfix and a data portion; remove at least one of the cyclic prefix or the cyclic postfix; transform the data portion with a discrete Fourier transform; estimate the channel frequency response and modulation of the burst; undo an effect of a channel on the data portion by using the estimated channel frequency response of the channel on the transformed data; use an inverse discrete Fourier transform on the result of the equalizing step; and further process the output of the equalization step to decode the transmitted bits. | 02-07-2013 |
20140321566 | ANTENNA POLARIZATION OPTIMIZATION FOR WIRELESS COMMUNICATIONS - Embodiments are directed to providing communication between a first device and a second device by: iterating, by the first device, over a number of transmitter antenna polarization types in the first device, constructing, by the first device, a number of data units based on each of the transmitter antenna polarization types, transmitting, by the first device, each of the data units for each of a number of receiver antenna polarization types in the second device, receiving, by the first device, an indication of a transmitter antenna polarization type in the first device included in the number of transmitter antenna polarization types in the first device, and transmitting, by the first device, data using the indicated transmitter antenna polarization type. | 10-30-2014 |
20140348261 | SYSTEMS AND METHODS FOR COMMUNICATING USING ASK OR QAM WITH UNEVEN SYMBOL CONSTELLATION - Systems and methods of performing ASK or QAM modulation with uneven distance between symbols are provided. These are used to provide differing BER performances among bits sent from a transmitter to a receiver. | 11-27-2014 |
Patent application number | Description | Published |
20100040166 | SYSTEMS AND METHODS FOR TRAINING SEQUENCE SELECTION, TRANSMISSION AND RECEPTION - Methods of training sequence selection are provided that involve optimization in terms of SNR degradation. Various sets of training sequences produced using the methods, and transmitters and receivers encoded with such sequences are provided. | 02-18-2010 |
20110176620 | SYSTEMS, DEVICES, AND METHODS FOR TRAINING SEQUENCE TRANSMISSION AND RECEPTION - A training sequence helps optimize SNR degradation in a wireless communication. Various sets of training sequences may be stored in a repository, and transmitters and receivers encoded with such sequences transmit at least one of the sequences between them as part of the wireless transmission of data. | 07-21-2011 |
20110189984 | MULTIPLE INPUT MULTIPLE OUTPUT USER EQUIPMENT RADIO FREQUENCY ASSISTANT SYSTEM - A user equipment and a wireless radio frequency assistant in a communication system that supports multiple input multiple output. The wireless radio frequency assistant and the user equipment operate together as a single system. The user equipment controls and activates the wireless radio frequency assistant to transform a first frequency of a radio frequency signal transmitted to the system of user equipment and the wireless radio frequency assistant to a second frequency. The wireless radio frequency assistant transmits the second frequency to the user equipment. | 08-04-2011 |
20110205947 | COMMUNICATION OF REDUNDANT SACCH SLOTS DURING DISCONTINUOUS TRANSMISSION MODE FOR VAMOS - The application relates to a method for communication from a second mobile station to a base station or vice versa. In a given multiframe, a first SACCH slot associated with the second mobile station is communicated (i.e. received or transmitted or both) via the second VAMOS subchannel. In the same multiframe, a redundant second SACCH slot associated with the second mobile station is communicated. The communicating step is performed either by the second mobile station or by the base station. The second SACCH slot may be communicated via the second VAMOS subchannel, in case the second VAMOS subchannel is in DTX mode. In an alternative embodiment, the second SACCH slot may be communicated via a first VAMOS subchannel, in case the first VAMOS subchannel is in DTX mode, wherein the first and second VAMOS subchannels share a common time slot and have the same carrier frequency. Both embodiments may be combined: I.e. in case the second VAMOS subchannel is in DTX mode, the second SACCH slot is communicated via the second VAMOS subchannel, and in case the first VAMOS subchannel is in DTX mode, the second SACCH slot may be communicated via the first VAMOS subchannel. | 08-25-2011 |
20120163495 | SYSTEMS, DEVICES, AND METHODS FOR TRAINING SEQUENCE TRANSMISSION AND RECEPTION - A training sequence helps optimize SNR degradation in a wireless communication. Various sets of training sequences may be stored in a repository, and transmitters and receivers encoded with such sequences transmit at least one of the sequences between them as part of the wireless transmission of data. | 06-28-2012 |
20140036934 | METHOD AND SYSTEM FOR BURST FORMATTING OF PRECODED EGPRS2 SUPPORTING LEGACY USER MULTIPLEXING - A method and system for burst formatting of precoded EPGRS2 supporting legacy user multiplexing, the method generating, at a transmitter, a burst containing a plurality of inverse discrete Fourier transform (‘IDFT’) precoded symbols and plurality of non-IDFT precoded mid-amble symbols, wherein the IDFT precoded symbols are addressed for a first mobile device, and the non-IDFT precoded mid-amble symbols contain data addressed to a second mobile device. | 02-06-2014 |
20150063495 | SOFT DETECTION OF M-ARY DPSK SIGNALS - In some implementations, a method of a receiver includes receiving an M-ary differential phase-shift keying (DPSK) signal containing a phase offset and optionally a phase rotation. The phase offset of the received signal may be estimated. A soft detection metric employing the estimated phase offset may be calculated to provide enhanced receiver performance. The method may include subtracting the phase offset estimate from the received signal prior to calculating the soft detection metric and/or de-rotating the phase of the received signal by the same amount of the phase rotation prior to estimating the phase offset of the received signal. Estimating the phase offset may be based on maximum likelihood principle. The soft detection metric may be a log-likelihood ratio (LLR) for soft detection of the received M-ary DPSK signal and the calculation of the LLR may be based upon a conditional joint probability density function of two consecutively received symbols. | 03-05-2015 |