ZTE WISTRON TELECOM AB Patent applications |
Patent application number | Title | Published |
20150319678 | METHOD AND APPARATUS FOR ANTI-BLOCKING HETNET DEPLOYMENT - A new approach to anti-blocking cellularcommunication for HetNet deployment is proposed. First, a block detector sends a block indicator from an LPN to a scheduler in a macro base station. The scheduler then collects the block indicator statistics of each LPN on a sub-frame basis and updates the statistics in each sub-frame. If the statistics of received block indicators for one sub-frame during an observation period of a specific LPN exceeds a first predefined threshold, then the scheduler will not schedule any more uplink transmission to the LPN during the sub-frame for those UEs which are connected to the LPN. When the statistics of received block indicators becomes less than a second predefined threshold, which is less than the first threshold, the scheduler removes the limitation on uplink transmission to the LPN and allocates the sub-frame of the LPN as usual. | 11-05-2015 |
20150281973 | DYNAMIC TRANSMISSION ANTENNA RECONFIGURATION IN WIRELESS NETWORKS - A wireless communication technique includes configuring a first antenna group to transmit common system information, a common reference signal, and data according to a first format and a second format to wireless devices in a cell, configuring a second antenna group to transmit data according to the second format, but no common system information or common reference signals, to wireless devices in the cell and dynamically assigning, based on a network operational status, antennas from a plurality of antennas to either the first antenna group or the second antenna group. | 10-01-2015 |
20140333377 | CAPTURE BUFFER OF DIGITAL PREDISTORTION SYSTEMS - An improved DPD system includes a predistortion module having at least one predistortion function. The predistortion module is configured to receive and subsequently process a baseband signal. The system also includes a power amplifier configured to receive the processed baseband signal from the predistortion module. The system further includes a model calculator configured to program priorities for predistortion functions so that the processed baseband signal transmitted from the predistortion module corresponds to the transmission power of the power amplifier. The model calculator is further configured to send a trigger signal to indicate when data capture from the power amplifier should begin so as to update the predistortion functions. A trigger module in the system is configured to receive the trigger signal and to initiate data capture from the power amplifier upon receipt of the trigger signal. | 11-13-2014 |
20140328438 | Apparatus And Method For Cancelling In-Band Interferences - The present document discloses an apparatus and method for cancelling in-band interference in a cellular telecommunication system which using multiple-input multiple-output technique. The method includes: receiving a transmitted signal and obtaining an interfering data stream; calculating a value of a credit; deciding whether the credit is above a predefined threshold; regenerating an interference signal by using the interfering data stream if the credit is above the predefined threshold; subtracting the regenerated interference signal from the received transmitted signal to obtain a target signal; and demodulating and decoding the target signal. By using the apparatus and method, the concerned signal can be regenerated even when there is only small number of error bits while all the other bits are correctly decoded. Also, the target stream would be able to know whether the interfering stream can be regenerated or not, before the decoding. | 11-06-2014 |
20140248907 | METHOD AND APPARATUS FOR ESTIMATING SPEED OF A MOBILE TERMINAL - Systems, devices and techniques for wireless communications include receiving a plurality of wireless transmissions over an observation period from a transmitter of a mobile terminal, calculating a plurality of frequency offset values based on the received plurality of wireless transmissions and estimating a speed value based on the plurality frequency offset values. In some implementations, the speed value is determined as a function of a computed frequency offset measurement error. Implementations can be made to include estimating channel characteristics in communication between a base station and the mobile terminal based on the estimated speed and optimizing a property in communications with the mobile terminal based on the estimated channel characteristics. In some implementations, the property can include a modulation scheme or scheduling of transmissions for communications between the base station and the mobile terminal. | 09-04-2014 |
20140200009 | OPERATION OF A HETEROGENEOUS WIRELESS NETWORK BY DETERMINING LOCATION OF A WIRELESS DEVICE - A heterogeneous wireless communication network includes a macrocell base station that one or more low power nodes. The location of a wireless device is estimated based on feedback reports received from the wireless device in response to downlink transmissions of a reference signal. Based on the estimated location, a schedule for future transmissions of the reference signal to the wireless device are determined. The schedule specifies a frequency of transmission of the reference signals. The schedule specifies downlink transmission antenna configuration to be used for the reference signal transmissions. | 07-17-2014 |
20140092879 | DOWNLINK TRANSMISSION POINT SELECTION IN A WIRELESS HETEROGENEOUS NETWORK - A heterogeneous wireless communication network comprises a macrocell base station that includes a first transmission point, at least one microcell base station that includes a second transmission point and a controller configured to enable transmission of wireless data from the macrocell base station and the at least one microcell base station to a user equipment (UE). The controller is configured to determine a set of transmission point combinations for providing downlink data, determine, using a statistics of ACKs and NACKs received for previous downlink transmissions from the transmission point combinations, a sequence of downlink transmissions to the UE from the transmission point combinations in the set. | 04-03-2014 |
20130219241 | METHOD FOR STOPPING ITERATION IN AN ITERATIVE TURBO DECODER AND AN ITERATIVE TURBO DECODER - The present document discloses a method for stopping iteration in an iterative Turbo decoder and an iterative Turbo decoder. Hard decisions from the two convolutional decoders of the iterative Turbo decoder are used simultaneously to determining when to stop the iteration in the iterative Turbo decoder. | 08-22-2013 |
20130176841 | Method and Apparatus for Receiving Physical Uplink Control Channel in LTE System - The present document discloses an apparatus for receiving Physical Uplink Control Channel (PUCCH) in Long Term Evolution (LTE) system, comprising: blocks of system FFT performing system FFT on data from a plurality of antennas, blocks of PUCCH RB processing units receiving the allocated logic resource index table and the local base sequence and output of the blocks of system FFT, and generating DMRS despread outputs and data values; a block of SR detection for receiving the data values and the DMRS despread outputs, and for generating SR detection results; blocks of user data extraction receiving data values and DMRS despread outputs, and performing user data extraction; blocks of PUCCH user processing units receiving an orthogonal sequence index, the data values and an output from blocks of user data extraction, and generating a ACK/NAK/CQI signal for a concerned UE. | 07-11-2013 |
20130077524 | Method and System for Improved Interference Cancellation by Path Selection - The present invention discloses method and system for improving performance of interference cancellation in a radio communication system. The method comprises: estimating power of an interfering signal contained in a received signal; estimating power of an additive estimate error signal added to the interfering signal; and canceling the interfering signal from the received signal if the estimated power of the additive estimate error signal is lower than the estimated power of the interfering signal. A cellular mobile terminal and a cellular base station comprising the system are also disclosed. | 03-28-2013 |
20120170635 | DYNAMICALLY ADJUSTED OFDM CHANNEL ESTIMATION FILTERING IN OFDM COMMUNICATIONS - Techniques for performing channel estimation in an orthogonal frequency domain multiplexing (OFDM) communications system include receiving a plurality of reference signals on a plurality of subcarriers, performing channel estimation to obtain a plurality of raw channel estimates based on the received plurality of reference signals, determining a number of raw channel estimates to be used for a channel estimate refinement and calculating a refined channel estimate using the number of raw channel estimates from the plurality of raw channel estimates. | 07-05-2012 |
20120170630 | CHANNEL ESTIMATION FILTERING - The disclosed methods and systems for improved OFDM channel estimation filtering take advantage of the presence of highly correlated adjacent subcarriers to reduce the computational intensiveness of channel estimation filtering. Specifically, baseband signals corresponding to a channel are received. The cyclic prefixes of the baseband signals are removed, and the resulting signal is transformed into the frequency domain, and compensated by a first time offset of the baseband receive signal. Subcarrier signals used to transmit the baseband signal are then extracted. Adjacent subcarriers having channel responses highly correlated to the subcarriers of the channel are identified, and the signal is compensated by a second time offset that corresponds to a minimal angle of the autocorrelation function of the subcarrier and adjacent subcarriers. The resulting signal is filtered to produce filtered channel estimates, using a filter having a filter length corresponding to the number of highly correlated subcarriers that were identified. | 07-05-2012 |
20120092067 | METHOD AND APPARATUS FOR LINEARIZING A NON-LINEAR POWER AMPLIFIER - An apparatus and method for linearizing a non-linear power amplifier. The method comprises: performing an iteration algorithm by using a desired output signal of the non-linear power amplifier, to calculate an input signal of the non-linear power amplifier, whereby with the calculated input signal of the non-linear power amplifier, the non-linear power amplifier is linearized. The apparatus and method can produce a signal on the output of the non-linear power amplifier with an arbitrarily high quality of performance. | 04-19-2012 |
20120032739 | DIGITAL PREDISTORTION CIRCUIT WITH EXTENDED OPERATING RANGE AND A METHOD THEREOF - A digital predistortion circuit and method with extended operating range includes a predistortion function, a D/A converter, a multiplier for performing frequency translation and a power amplifier. The digital predistortion circuit includes a multiplier for receiving a signal to be transmitted and a gain correction factor, multiplying the gain correction factor with the signal to be transmitted, and outputting a result of the multiplication to the predistortion function, as well as a device for calculating the gain correction factor by using a predetermined reference gain and an estimated gain of the power amplifier, and outputting the calculated gain correction factor to the multiplier, whereby a gain of the power amplifier is quickly corrected. The digital predistortion circuit and the method thereof produce acceptable results for a more expanded range of TX power levels. | 02-09-2012 |
20120020429 | APPARATUS AND METHOD FOR COMPENSATING FOR CLIPPING POWER LOSSES - An apparatus and method for compensating for transmit power losses that are caused by the addition of a clipping or crest factor reduction module in the TX path of a communications system. The method includes applying a gain to a signal input into the crest factor reduction module, so that a power of a signal output from the crest factor reduction module is equal to a power of a signal output from a baseband signal generation module in the TX chain. The apparatus and method have the benefit that the peaks of the signal to be transmitted will be consistent over a wide range of TX power values. | 01-26-2012 |