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Al-Dhahir
Naofal Al-Dhahir, Plano, TX US
| Patent application number | Description | Published |
|---|---|---|
| 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 |
Naofal Al-Dhahir, Morris Twp, NJ US
| Patent application number | Description | Published |
|---|---|---|
| 20100091890 | Creating Training Sequences for Space-Time Diversity Arrangements - A training sequence is created for space-time diversity arrangement, having any training sequence length, while limiting the training sequence to a standard constellation. Given a number of channel unknowns that need to be estimated, L, a training sequence can be creates that yields minimum means squared estimation error for lengths N | 04-15-2010 |
| 20100220803 | Training-Based Channel Estimation for Multiple-Antennas - The burden of designing multiple training sequences for systems having multiple transmit antennas, is drastically reduced by employing a single sequence from which the necessary multiple sequences are developed. The single sequence is selected to create sequences that have an impulse-like autocorrelation function and zero cross correlations. A sequence of any desired length N | 09-02-2010 |
Naofal Al-Dhahir, Morristown, NJ US
| Patent application number | Description | Published |
|---|---|---|
| 20090041107 | Finite-length equalization over multi-input multi-output channels - A MIMO Decision Feedback Equalizer improves operation of a receiver by canceling the spatio-temporal interference effects caused by the MIMO channel memory with a set of FIR filters in both the feed-forward and the feedback MIMO filters. The coefficients of these FIR filters can be fashioned to provide a variety of controls by the designer. | 02-12-2009 |
| 20090323797 | Finite-Length Equalization Over Multi-Input Multi-Output Channels - A MIMO Decision Feedback Equalizer improves operation of a receiver by canceling the spatio-temporal interference effects caused by the MIMO channel memory with a set of FIR filters in both the feed-forward and the feedback MIMO filters. The coefficients of these FIR filters can be fashioned to provide a variety of controls by the designer. | 12-31-2009 |
Naofal Al-Dhahir, Morris Township, NJ US
| Patent application number | Description | Published |
|---|---|---|
| 20080232505 | Frequency-domain method for joint equalization and decoding of space-time block codes - Space-time block coding is combined with single-carrier, minimum-mean-square-error, frequency-domain equalization for wireless communication through a medium characterized by multi-paths. The transmitter encodes incoming symbols into two or more streams that are transmitted over a corresponding number of transmitting antennas. The encoding employs modulo arithmetic. Decoding in the receiver proceeds by converting received signals to frequency domain, linearly combining the signals to separate contribution of the signals from the two or more transmitting antennas equalizing the separated signals, converting the equalized signals to time domain, and applying the converted signals to a decision circuit. | 09-25-2008 |
Naofal M. Al-Dhahir, Plano, TX US
| Patent application number | Description | Published |
|---|---|---|
| 20120093204 | PROCESSOR, MODEM AND METHOD FOR CANCELLING ALIEN NOISE IN COORDINATED DIGITAL SUBSCRIBER LINES - A method of cancelling alien noise in coordinated DSL lines, a method of smoothing an alien noise covariance estimate, and a processor and modem for cancelling alien noise in coordinated DSL lines. In one embodiment, the method of cancelling alien noise includes: (1) estimating alien noise vectors for at least some training symbols, (2) arranging the alien noise vectors in a matrix dimensioned for a number of coordinated DSL lines, (3) orthonormally transforming the matrix into a lower-triangular matrix and (4) computing alien noise prediction filters from the lower-triangular matrix. | 04-19-2012 |