Al-Naffouri
Basel Al-Naffouri, San Francisco, CA US
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20160036759 | SYSTEMS AND METHODS FOR EVENT STREAM MANAGEMENT - A system for managing event streams is provided that includes a volatile memory, a non-volatile memory, and a processor. The volatile memory is configured to store, for each of a plurality of event streams associated with the client device, metadata indicative of events not yet delivered to a client device and the content associated with only a most recent event of the event stream. The non-volatile memory is configured to store the content associated with each of undelivered events. The processor is configured to, upon receiving a request from the client device, retrieve from the volatile memory, without accessing the non-volatile memory, data indicative of a current state of an event stream associated with the client device. The processor is further configured to deliver the retrieved data indicative of the current state of the event stream. | 02-04-2016 |
Tareo Y. Al-Naffouri, Dhahran SA
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20130177089 | METHOD OF PERFORMING PEAK REDUCTION AND CLIPPING MITIGATION - The method of performing peak reduction and clipping mitigation provides a compressive sensing algorithm at the receiver of a peak-reducing sparse clipper applied to an OFDM signal at the transmitter. By exploiting the sparsity of the OFDM signal in the time domain relative to a pre-defined clipping threshold, the method depends on partially observing the frequency content of extremely simple sparse clippers to recover the locations, magnitudes, and phases of the clipped coefficients of the peak-reduced signal. | 07-11-2013 |
Tareq Al-Naffouri, Dhahran SA
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20100246730 | Cyclic prefix-based enhanced data recovery method - The cyclic prefix-based enhanced data recovery method retains the cyclic prefix (CP) upon reception and routes the CP to a data detection module to enhance the operation of the orthogonal frequency division multiplexed (OFDM) receiver whether operating in the blind, semi-blind, training, or perfectly known channel modes. Processing of the OFDM symbol and the CP is performed in the data detector and obtains data recovery by computing a maximum likelihood estimation based on the CP and the OFDM symbols. | 09-30-2010 |
Tareq Al-Naffouri, Thuwal SA
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20150112220 | APPARATUS AND METHOD FOR WIRELESS MONITORING USING ULTRA-WIDEBAND FREQUENCIES - A system for and a method of wirelessly monitoring one or more patients can include transmitting ultra-wideband pulses toward the one or more patients, receiving ultra-wideband signals, and sampling the ultra-wideband signals. Sampling the ultra-wideband pulses can be performed with a sample rate that is less than the Nyquist rate. Impulse response can be estimated and/or recovered by exploiting sparsity of the impulse response. | 04-23-2015 |
Tareq Y. Al-Naffouri, Dhahran SA
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20100322327 | Method of estimating and removing noise in OFDM systems - The present invention relates to impulse noise estimation and removal in orthogonal frequency division multiplexing (OFDM) transmissions, and particularly to transmissions in power line communications and digital subscriber line (DSL) transmissions. The method includes the steps of: modulating data to be transmitted; performing an inverse fast Fourier transform; inserting a cyclic prefix into the data; transmitting the data as a set of OFDM symbols via a channel; receiving the set of OFDM symbols; removing the cyclic prefix; performing a fast Fourier transform; estimating impulse noise; canceling the impulse noise based upon the estimated impulse noise to produce a set of impulse noise-free data; estimating the channel; and demodulating and detecting the data transmitted based upon the estimated channel and the set of impulse noise-free data. | 12-23-2010 |
20110122930 | OFDM peak-to-average power ratio reduction method - The OFDM peak-to-average power ratio reduction apparatus and method provides a compressive sensing algorithm that estimates the sparsity pattern of a sparse vector by a limited number of measurements. When the positions of the clipped peaks are known beforehand by, e.g., a genie-augmented receiver, then the algorithm optimally performs amplitude estimation utilizing a least squares estimation technique. When the cardinality of the peak-reducing signal is known at the receiver at initialization, the receiver optimizes the estimated peak-reducing signal by using least squares. | 05-26-2011 |
20150071328 | PEAK DETECTION METHOD USING BLIND SOURCE SEPARATION - The peak detection method using blind source separation extracts true peaks from noisy peaks in a more robust way that does not require any a priori information. Information regarding true peak location is obtained by thresholding the output of a wavelet transform. The value of the threshold is dependent on noise variance. While noise variance is normally unknown, the present method implements a blind source separation technique to calculate the noise variance. The blind source separation technique does not require information of the incoming signal or the channel noise, and hence is suitable for CR (cognitive radio) peak detection. | 03-12-2015 |
Tareq Yousef Al-Naffouri, Dhahran SA
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20150244553 | SYSTEM AND METHOD FOR JOINT COMPENSATION OF POWER AMPLIFIER'S DISTORTION - The system and method for joint compensation of power amplifier's distortion provides a linearization scheme for transmitter power amplifiers driven by orthogonal frequency division multiplexing signals. A pre-compensated over-driven amplifier is employed at the transmitter. The over-driven amplifier's distortions are considered as a sparse phenomenon and compressive sensing (CS) algorithms are employed at the receiver to estimate and compensate for these distortions. A bandwidth efficient data aided scheme which does not require reserving subcarriers specifically for CS measurements is utilized. | 08-27-2015 |
Tareq Yousuf Al-Naffouri, Dhahran SA
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20110090975 | OFDM inter-carrier interference cancellation method - The OFDM channel estimation and Inter-Carrier Interference (ICI) cancellation method uses a few pilots within Orthogonal Frequency Division Multiplexing (OFDM) systems in general, and mobile OFDM systems in particular. The frequency domain channel is estimated using an eigenvalue based model reduction technique with high accuracy. A Minimum Mean Square Error (MMSE) based Finite Impulse Response (FIR) equalizer is then used to obtain an ICI free estimate of the transmitted signal. | 04-21-2011 |
20110206148 | METHOD FOR MITIGATING INTERFERENCE IN OFDM COMMUNICATIONS SYSTEMS - The method for mitigating interference in Orthogonal Frequency Division Multiplexing (OFDM) communications systems uses comb-type pilot signals in a doubly selective channel where the pilot signals are calculated to have zero correlation sequences in order to maintain orthogonality where there is a high Doppler effect to mitigate intercarrier interference. The pilot signals may be precomputed, stored in a look-up table, and selected based upon total power constraints of the pilot signals. The steps of the method may be performed by a Finite Impulse Response (FIR) equalizer. | 08-25-2011 |
20150280942 | LOW-COMPLEXITY METHOD FOR ESTIMATING IMPULSE-RADIO UWB WIRELESS CHANNELS - A Low-Complexity Minimum Mean Square Error (MMSE) method for estimation of impulse response or channel response of Impulse-Radio Ultra-Wideband (IR-UWB) wireless channels which exploits the sparsity of the received signal profile and the structure of the sensing matrix. The method comprises of first sub-sampling a received signal profile; second finding a minimum mean square error estimate of the impulse-radio ultra-wideband communication channel by Bayesian estimation according to priori channel statistics; and third identifying one or more substantially orthogonal clusters in the received signal profile. Impulse response of the impulse-radio ultra-wideband communication channel is the sum of the total number of resolvable multipath components, each with a real valued fading gain, and delay, relative to the arrival of the first path and impulse is the Dirac delta function. | 10-01-2015 |