Patent application number | Description | Published |
20110150152 | SYSTEMS AND METHODS PROVIDING FREQUENCY-DOMAIN AUTOMATIC GAIN CONTROL (AGC) - A method for Automatic Gain Control (AGC) in a receiver is performed by a circuit having an inner loop and an outer loop. The method includes performing an outer loop energy detection, mitigating interference using the outer loop energy detection, and performing a frequency domain energy measurement in the inner loop. The method also includes adjusting a digital gain component in the inner loop and an analog gain component in the outer loop in response to the frequency domain energy measurement. | 06-23-2011 |
20130016765 | SELECTION OF WINDOW LENGTH BASED ON MULTIPLE METRICS - Techniques for windowing a transmission are disclosed herein. In one aspect of the disclosure, the length of a window used for windowing may be configurable and determined for a transmission based on a configuration of the transmission. The configuration of the transmission may be determined based on one or more parameters such as a system bandwidth, a bandwidth assigned for the transmission, the location of the assigned bandwidth within the system bandwidth, a modulation type used for the transmission, etc. In another aspect of the disclosure, a preferred length for a window may be determined for each of a number of possible configurations of a transmission. Different possible window lengths may be evaluated for each possible configuration based on one or more performance metrics. For each configuration, a window length that can provide the best performance for that configuration may be selected as a preferred window length for that configuration. | 01-17-2013 |
20130122841 | SEARCHER DETECTION METRICS - Methods and apparatus for determining a reference sequence and timing based on normalized correlations are described. One example method generally includes receiving, at a first antenna of an apparatus, a first signal comprising a reference sequence; receiving, at a second antenna of the apparatus, a second signal comprising the same reference sequence; sampling the first and second signals to form first and second signal sequences; correlating the first and second signal sequences with each of one or more candidate sequences for the reference sequence using normalization; and determining the reference sequence and timing for the first and second signals based on the normalized correlations. | 05-16-2013 |
20130142060 | INSTANTANEOUS NOISE NORMALIZED SEARCHER METRICS - In a wireless communication system employing frequency division duplexing (FDD) that may be synchronous or asynchronous for transmitting data, in which the underlying Rx signals have different statistics, and where the hypothesis testing is degraded thereby, the improvement of generating a complementary searcher metric that is a noise metric (NM) comprising: projecting the Rx signals into the noise subspace of a pilot sequence. | 06-06-2013 |
20130223256 | CONNECTED MODE GAP MEASUREMENT FOR LTE TDD - A method of wireless communication includes selecting three or more reference signal symbols from at least two subframes detected within a measurement window location during a connected mode gap. The selected reference signal symbols are selected from reference signal symbols of at least one non-MBSFN subframe and one reference signal symbol of a special subframe. The method also includes combining the selected reference signal symbols and estimating a reference signal received power (RSRP) based at least in part on a result of the combining. | 08-29-2013 |
20130229955 | FREQUENCY SCAN METHOD FOR DETERMINING THE SYSTEM CENTER FREQUENCY FOR LTE TDD - A method, an apparatus, and a computer program product for wireless communication are provided in which a set of time intervals is obtained from a received radio frequency signal. A power profile is determined for a frequency spectrum segment in each time interval. A first list is used to identify frequency spectrum segments that exhibit a power or energy profile over a range of frequencies associated with a downlink channel bandwidth, and a second list is used to identify frequency spectrum segments that have a total or average energy greater than a threshold energy relative to a noise floor. An absolute radio frequency channel number (ARFCN) of a wireless communication system is determined based on the time intervals identified in the first and second lists. | 09-05-2013 |
20130235769 | METHODS AND APPARATUS FOR ENABLING NON-DESTAGGERED CHANNEL ESTIMATION - Certain aspects of the present disclosure relate to techniques and apparatus for enabling non-destaggered channel estimation. In aspects, a method for wireless communications is provided including determining a first channel impulse response (CIR) based on a first set of received reference signals staggered in time, determining a second CIR based on a second set of received reference signals from the same sub-frame time slot, wherein a reference signal is associated with one of a plurality of virtual transmit antenna ports, and aligning the first CIR and the second CIR based, at least in part, on a time tracking loop (TTL) timing offset. | 09-12-2013 |
20130242766 | PRE-SIB2 CHANNEL ESTIMATION AND SIGNAL PROCESSING IN THE PRESENCE OF MBSFN FOR LTE - A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus updates a CIE in guaranteed non-MBSFN subframes. The apparatus refrains from updating at least one of an AGC, a TTL, an FTL, or an SNR estimation (FTL_SNR) in potential MBSFN subframes before a SIB is decoded to ascertain which subframes of a radio frame are MBSFN subframes and non-MBSFN subframes. The MBSFN subframes include a subset of the potential MBSFN subframes. The non-MBSFN subframes include a remaining subset of the potential MBSFN subframes and the guaranteed non-MBSFN subframes. | 09-19-2013 |
20130242820 | DIGITAL FILTER CONTROL FOR FILTER TRACKING SPEEDUP - A method for speeding up a filter tracking speed includes scaling filter coefficients based at least in part on an uplink/downlink configuration in a time division duplex (TDD) or a multimedia broadcast single frequency network (MBSFN) system. The method also includes applying scaled filter coefficients during at least one downlink subframe to control a filter tracking speed. | 09-19-2013 |
20130272218 | METHODS AND APPARATUS FOR DETERMINING HOW TO PERFORM OPERATIONS AFTER COMMUNICATION SUSPEND BASED ON INFORMATION BEFORE THE SUSPEND - Certain aspects of the present disclosure relate to methods and apparatus for Channel Quality Indicator (CQI) reporting after resumption of Long Term Evolution (LTE) after a temporary suspension. In certain aspects, in order to minimize performance penalty to LTE on resumption after an LTE tune away for example to service a different Radio Access Technology, information available from before the LTE tune away may be used in addition to one or more additional parameters for determining how to perform LTE CQI calculation/update after tuning back to LTE. In certain aspects, a decision regarding whether a User Equipment (UE) reports a CQI based on channel conditions before the LTE tune away or reports a CQI based on channel conditions after tuning back to LTE may be based on a value of the Doppler estimate, a time duration of the LTE tune away, or a combination thereof. | 10-17-2013 |
20140029483 | METHOD AND APPARATUS FOR TDD VIRTUAL CELL SELECTION - A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be a UE. The UE may search for one or more cells during each of a number of search periods, select a first cell that has been detected in at least two of the search periods, and determine an LNA gain based on information associated with the first cell. | 01-30-2014 |
20140031037 | CELL SELECTION BASED ON FAVORABLE ULDL CONFIGURATION IN LTE/TDD NETWORKS - Cell selection procedures performed in a wireless network are disclosed that include determining a uplink/downlink (ULDL) preference of a User Equipment (UE) in communication with a first evolved Node B (eNB) having a first ULDL configuration and a second eNB having a second ULDL configuration. The UE compares the first and second ULDL configurations to the ULDL preference. The UE selects the first eNB based on the first ULDL configuration matching the ULDL preference. In alternative aspects, a first eNB having a first ULDL configuration and in communication with a UE receives the ULDL preference of the UE. The first eNB compares the first ULDL configuration and a second ULDL configuration of a second eNB in communication with the UE to the ULDL preference. The first eNB selects the second eNB based on the second ULDL configuration matching the ULDL preference. | 01-30-2014 |
20140270032 | Phase Detection and Correction for Non-Continuous Local Oscillator Generator - Techniques for detecting and correcting phase discontinuity of a local oscillator (LO) signal are disclosed. In one design, a wireless device includes an LO generator and a phase detector. The LO generator generates an LO signal used for frequency conversion and is periodically powered on and off. The phase detector detects the phase of the LO signal when the LO generator is powered on. The detected phase of the LO signal is used to identify phase discontinuity of the LO signal. The wireless device may further include (i) a single-tone generator that generates a single-tone signal used to detect the phase of the LO signal, (ii) a downconverter that downconverts the single-tone signal with the LO signal and provides a downconverted signal used by the phase detector to detect the phase of LO signal, and (iii) phase corrector that corrects phase discontinuity of the LO signal in the analog domain or digital domain. | 09-18-2014 |
20140335863 | USER EQUIPMENT PANIC STATES(S) UNDER CONNECTED MODE DISCONTINUOUS RECEPTION STATE IN LONG TERM EVOLUTION - Certain aspects of the present disclosure relate to methods and apparatus for wireless communication, and more particularly, to methods and apparatus that utilize one or more user equipment (UE) panic states under connected discontinuous reception (C-DRX) mode in long term evolution (LTE). | 11-13-2014 |