| Patent application number | Description | Published |
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| 20080320067 | METHOD AND SYSTEM FOR CONSTANT AMPLITUDE RANDOM SEQUENCE CONSTRUCTION - Aspects of a method and system for constant amplitude random sequence construction may include generating one or more real signal components via a random number generator, wherein each of the generated one or more real signal components may be subjected to an amplitude constraint. One or more corresponding imaginary signal components may be generated, each of which may be derived from a relationship between the generated one or more real signal components and the amplitude constraint. At least the generated one or more real signal components and the generated one or more corresponding imaginary signal components may be combined to generate a complex constant amplitude signal. The one or more real signal components may be generated according to a probability distribution in the random number generator. | 12-25-2008 |
| 20080320070 | METHOD AND SYSTEM FOR EFFICIENT FULL RESOLUTION CORRELATION - Aspects of a method and system for efficient full resolution correlation may include correlating a first signal with a second signal at a rate corresponding to a first discrete signal, wherein each sample of the first signal may be generated by summing a plurality of consecutive samples from the first discrete signal, and the second signal may be generated by summing the plurality of consecutive samples from a second discrete signal. The correlating may be performed by a matched filter and/or a correlator. The first signal comprising N samples may be generated by summing L consecutive samples for each of the N samples from the first discrete signal comprising N*L samples. The second signal comprising N samples may be generated by summing L consecutive samples for each of the N samples from the second discrete signal comprising N*L samples. The first signal and the second signal may be correlated by multiplying the N samples of the first signal with the N samples of the second signal in N multipliers and summing a plurality of outputs of the multipliers. A maximum of the correlating may be determined to achieve synchronization between the first discrete signal and the second discrete signal | 12-25-2008 |
| 20090135804 | Method And System For Ordering Sequences For Synchronization Signaling In A Wireless System - Certain embodiments of the invention may be found in a method and system for ordering sequences for synchronization signaling in a wireless system. Various aspects of the invention may enable a user equipment (UE) receiving signals from eUTRAN base stations (NodeBs). The received signals may comprise synchronization sequences transmitted using synchronization signals such as a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). The UE may be enabled to determine the received PSS sequence and SSS sequence for downlink synchronization by correlating the received signal with a set of PSS sequences and a set of SSS sequences, respectively. An SSS sequence may be constructed from two length m-sequences from an ordered set of m-sequences. The ordered set of m-sequences may form a Walsh-Hadamard matrix, which enables the UE to use a fast Walsh-Hadamard matrix transform in SSS sequence processing. | 05-28-2009 |
| 20090213724 | METHOD AND SYSTEM FOR I/Q BRANCH EQUALIZATION IN OFDM SYSTEMS - Aspects of a method and system for I/Q branch equalization in OFDM systems may include determining a transfer function mismatch between an in-phase processing branch, and/or a quadrature processing branch in an OFDM receiver. The determined transfer function mismatch may be compensated for, by applying equalization after a fast Fourier transform (FFT) in an in-phase processing branch and/or a quadrature processing branch. The OFDM system may be compliant with, for example, UMTS LTE (EUTRA), WiMAX (IEEE 802.16), DVB-H, and WLAN (IEEE 802.11). A transfer function may be measured for an in-phase branch filter and/or quadrature branch filter to determine the transfer function mismatch. The transfer function mismatch may be compensated for, in frequency domain by the equalizer. The transfer function mismatch may comprise magnitude and/or phase response mismatch, wherein the magnitude and/or phase response mismatch may be a function of frequency. | 08-27-2009 |
| 20090232051 | METHOD AND SYSTEM FOR THE EXTENSION OF FREQUENCY OFFSET ESTIMATION RANGE BASED ON CORRELATION OF COMPLEX SEQUENCES - Aspects of a method and system for the extension of frequency offset estimation range based on correlation of complex sequences may include partitioning each of a received sample sequence and a local replica sample sequence into three or more similar length contiguous sample sub-sequences. For each of the three or more similar length contiguous sample sub-sequences, a correlation coefficient may be determined between corresponding sample sub-sequences of the partitioned received sample sequence and the local replica sample sequence. A plurality of phase differences may be determined based on adjacent ones of the determined correlation coefficients, and the determined plurality of phase differences may be averaged to generate a phase increment estimate. The communication system may be compliant with a wireless standard, comprising UMTS EUTRA (LTE), WiMAX (IEEE 802.16), and/or WLAN (IEEE 802.11). | 09-17-2009 |
| 20100067364 | METHOD AND SYSTEM FOR VARIANCE-BASED AUTOMATIC GAIN CONTROL IN OFDM SYSTEMS - Aspects of a method and system for variance-based automatic gain control in OFDM systems may include automatically controlling a gain for one or more received Orthogonal Frequency Division Multiplexing (OFDM) signals based on at least a signal variance derived from the received OFDM signals. The gain may be controlled via a variable gain amplifier, where the variable gain amplifier may be controlled via an analog and/or digital signal. The signal variance may be determined in an automatic gain control (AGC) circuit. The gain may be controlled via a feedback circuit. The signal variance may be generated via a difference between a mean-square signal and a mean-value-squared signal based on the received OFDM signals. The automatic gain control module may comprise a logarithm module, an integrator, and a dB-to-voltage mapper. The variance signal may be determined over a received slot of data. | 03-18-2010 |
| 20100069106 | METHOD AND SYSTEM FOR FRAME TIMING ACQUISITION IN EVOLVED UNIVERSAL TERRESTRIAL RADIO ACCESS (EUTRA) - Aspects of a method and system for frame timing acquisition in evolved universal terrestrial radio access (EUTRA) may include determining a received secondary synchronization sequence (SSS) based on a selected cyclic prefix length and on synchronization of a primary synchronization sequence (PSS). A first portion of information associated with the received SSS may be processed separately from a second portion of information associated with the received SSS. A frame timing and/or base station identifier may be determined by comparing the processed first portion of information with the processed second portion of information. The cyclic prefix length may be selected from a finite set of possible cyclic prefix lengths. The cyclic prefix length may be, for example, 9 samples or 32 samples. The primary synchronization sequence synchronization may be determined via correlation. | 03-18-2010 |
| 20110007704 | METHOD AND SYSTEM FOR USING SIGN BASED SYNCHRONIZATION SEQUENCES IN A CORRELATION PROCESS TO REDUCE CORRELATION COMPLEXITY IN AN OFDM SYSTEM - A mobile device receives a signal, from a base station, comprising a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). The received PSS and SSS are used to acquire cell-specific parameters so as to ensure communicates between the mobile device and the base station. The mobile device correlates the received signal in time domain using signs of each of a plurality of correlation reference sequences (reference PSSs). The mobile device generates sign based correlation reference PSSs using signs of the corresponding reference PSSs, which are generated based on a variety of Zadoff-Chu sequences. The received PSS is detected based on the correlation. No multiplication operations are used in the correlation process. Symbol timing is identified according to the detected PSS. The mobile device uses the identified symbol timing to baseband process the received signal. The received signal is an OFDM signal received over a 3GPP LTE/E-UTRA air interface. | 01-13-2011 |
| 20110007717 | METHOD AND SYSTEM FOR IMPLEMENTING MULTIPLE TIMING DOMAINS FOR PRIMARY AND SECONDARY SYNCHRONIZATION DETECTION IN EUTRA/LTE - A mobile device receives a signal, from a base station, comprising a primary synchronization sequence (PSS) and a secondary synchronization sequence (SSS). The mobile device utilizes two different sampling rates to perform the PSS synchronization and the SSS detection individually. For example, the mobile device synchronizes to the received PSS at a first sampling rate such as 0.96 MHz, which is determined based on the PSS transmission rate and/or the length of the received PSS. The mobile device detects the received SSS at a second sampling rate such as 1.92 MHz, which equals to the sampling rate for an analog-to-digital conversion at the mobile device. The received PSS and associated symbol timing are detected through the PSS synchronization to support the SSS detection. The detected SSS is used to acquire cell-specific parameters such as cell ID. The acquired cell-specific parameters ensure proper communications between the mobile device and the base station. | 01-13-2011 |
| 20110007718 | METHOD AND SYSTEM FOR GENERATING TIMED EVENTS IN A RADIO FRAME IN AN E-UTRA/LTE UE RECEIVER - A mobile device coupled to a common system clock receives a signal comprising a primary synchronization sequence (PSS) and a secondary synchronization sequence (SSS) in a radio frame. Sample counts are generated for timed events based on corresponding operating bandwidths. The timed events are detected at modulo sample counts of the generated sample counts according to corresponding operating bandwidths. PSS symbol timing determined via the PSS synchronization is aligned to the generated sample counts based on corresponding operating bandwidth. The generated sample counts are bit-shifted relative to the aligned PSS symbol timing for other timed events based on corresponding operating bandwidths. The one or more timed events are determined via performing modulo counting after the bit-shifting. Timing operations are performed at the determined timed events and the determined one or more timed events are refined, accordingly. | 01-13-2011 |
| 20110026413 | METHOD AND SYSTEM FOR MULTIPLE FREQUENCY HYPOTHESIS TESTING WITH FULL SYNCH ACQUISITION IN AN E-UTRA/LTE UE RECEIVER - A mobile device receives a radio frequency (RF) signal comprising a primary synchronization sequence (PSS) and a secondary synchronization sequence (SSS). The mobile device performs multiple frequency hypothesis (MFH) testing via multiple MFH branches. A SSS decoding and a PSS correlation process are performed, respectively, per MFH branch. The SSS decoding may be performed according to corresponding PSS detection. Cell-specific information such as cell ID information and/or Cyclic Prefix (CP) length is acquired per MFH branch based on corresponding PSS detection and SSS decoding. Subsequently, the mobile device selects a particular MFH branch with a maximum PSS correlation peak over the entire MFH branches. The cell-specific information from the selected MFH branch is utilized for communications within a corresponding cell if the information is detected consistently. The mobile device compares cell ID information and/or CP length information over the remaining MFH branches for consistency check. | 02-03-2011 |
| 20110026648 | METHOD AND SYSTEM FOR INCREASING THE ACCURACY OF FREQUENCY OFFSET ESTIMATION IN MULTIPLE FREQUENCY HYPOTHESIS TESTING IN AN E-UTRA/LTE UE RECEIVER - A mobile device receives a radio frequency (RF) signal comprising a primary synchronization sequence (PSS) and a secondary synchronization sequence (SSS). The mobile device performs multiple frequency hypothesis (MFH) testing via multiple MFH branches. A PSS correlation process is performed for each MFH branch. Frequency offset for receiving data is estimated using resulting correlation data. A desired offset is placed in each MFH branch. A baseband signal is frequency offset per MFH branch according to the desired frequency offset before the PSS correlation process. A received PSS is detected based on a maximum PSS correlation over the entire set of MFH branches. A frequency offset is estimated for the MFH branch associated with the detected PSS by combining an associated residual frequency with a corresponding desired offset. The frequency offset estimate is used for baseband signal processing and/or adjusting a reference oscillator frequency at the mobile device. | 02-03-2011 |
| 20110151817 | METHOD AND SYSTEM FOR REDUCING THE COMPLEXITY OF MULTI-FREQUENCY HYPOTHESIS TESTING USING AN ITERATIVE APPROACH - Aspects of a method and system for reducing the complexity of multi-frequency hypothesis testing using an iterative approach may include estimating a frequency offset of a received signal via a plurality of iterative frequency offset hypotheses tests. The iterative frequency offset hypotheses may be adjusted for each iteration. A correlation may be done between a primary synchronization signal (PSS), and one or more frequency offset versions of a received signal to control the adjustment of the iterative frequency offset hypotheses. A frequency of the received local oscillator signal may be adjusted based on the estimated frequency offset. One or more frequency offset version of the received signal may be generated via one or more multiplication, and the multiplication may be achieved via a multiplication signal corresponding to one or more frequency offsets. The frequency offset of the received signal may be estimated via the correlation. | 06-23-2011 |
