Patent application number | Description | Published |
20110182387 | Blind Mechanism for the Joint Estimation of Frequency Offset and Phase Offset for QAM Modulated Signals - A mechanism for jointly correcting carrier phase and carrier frequency errors in a demodulated signal. A computer system may receive samples of a baseband input signal (resulting from QAM demodulation). The computer system may compute values of a cost function J over a grid in a 2D angle-frequency space. A cost function value J(θ,ω) is computed for each point (θ,ω) in the grid by (a) applying a phase adjustment of angle θ and a frequency adjustment of frequency ω to the input signal; (b) performing one or more iterations of the K-means algorithm on the samples of the adjusted signal; (c) generated a sum on each K-means cluster; and (d) adding the sums. The point (θ | 07-28-2011 |
20120207248 | Estimation of Sample Clock Frequency Offset Using Error Vector Magnitude - A low complexity system and method for operating a receiver in order to estimate an offset between the actual sample clock rate 1/T | 08-16-2012 |
20130215986 | Blind Estimation of Frequency and Phase Offsets for Received Signals - A mechanism for jointly correcting carrier phase and carrier frequency errors in a demodulated signal. A computer system may receive samples of a baseband input signal (resulting from QAM demodulation). The computer system may compute values of a cost function J over a grid in a 2D angle-frequency space. A cost function value J(θ,ω) is computed for each point (θ,ω) in the grid by (a) applying a phase adjustment of angle θ and a frequency adjustment of frequency ω to the input signal; (b) performing one or more iterations of the K-means algorithm on the samples of the adjusted signal; (c) generated a sum on each K-means cluster; and (d) adding the sums. The point (θ | 08-22-2013 |
20130216005 | Blind Mechanism for Demodulating Offset QPSK Signals in the Presence of Carrier Phase Error - A computer-implemented system and method for blind demodulation of an offset QPSK input signal, involving repeatedly performing a set of operations, including: (a) applying a phase correction to the input signal based on an estimate of a carrier phase offset of the input signal to obtain a first modified signal; (b) shifting a quadrature component of the first modified signal by half a symbol period relative to an inphase component to obtain a second modified signal; (c) extracting a first sequence of symbols from the second modified signal, where the extraction includes estimating a symbol timing offset from the second modified signal; (d) performing hard-decision demodulation on the first sequence of symbols to obtain a second sequence of reference symbols; (e) computing a phase difference between the first sequence of symbols and second sequence of reference symbols; and (f) updating the carrier phase offset estimate using the phase difference. | 08-22-2013 |
20130230114 | Using Error Vector Magnitude to Estimate Sample Clock Frequency Offset - A low complexity system and method for operating a receiver in order to estimate an offset between the actual sample clock rate 1/T | 09-05-2013 |
20130287147 | Maximizing the Viterbi Winning Path Metric to Estimate Carrier Phase Offset in Continuous Phase Modulated Signals - A system and method for estimating carrier frequency offset Δf and carrier phase offset φ | 10-31-2013 |
20140040668 | Unit Testing and Analysis Using a Stored Reference Signal - Method and system for a test process. The method may include performing tests on one or more units under test (UUTs). At least one test on one or more UUTs may be performed. A signal may be acquired from the UUT. A reference signal may be retrieved. The reference signal may be derived from a transmitted signal characteristic of the UUT. The signal may be analyzed with respect to the reference signal. Results, useable to characterize the one or more UUTs, from performing the at least one test on the one or more UUTs may be stored. The reference signal may be derived from an initial test and may be stored for subsequent retrieval. A respective reference signal may be retrieved for all UUTs of the one or more UUTs for a respective test. The signal may be a radio frequency signal. The UUT may be a wireless mobile device. | 02-06-2014 |
20140126676 | Estimation of Sample Clock Frequency Offset Based on Error Vector Magnitude - A low complexity system and method for operating a receiver in order to estimate an offset between the actual sample clock rate 1/T | 05-08-2014 |