Ahmad S Aman, 63Clifton, VA

8169358, May 1, 2012

Jun 25, 2007

11/751137

John Michael Bourdelais - Vienna VA, US
Ahmad Khalid Aman - Fairfax VA, US

BBN Technologies - Cambridge MA

G01S 13/00

342 52, 342 57, 342192

A multi-band RF transceiver for transmitting communications data and radar signals includes a transmitter having a source of communications data and radar signals. A modulator combines the data and radar signals and then modulates the combined signal with a carrier signal generated by a synthesizer. A processor instructs the synthesizer to change the carrier frequency and the source to provide data and radar signals corresponding to the carrier frequency so that multiple bands are transmitted over a desired spectrum. A receiver includes a demodulator that demodulates the received signal and a synthesizer that generates a signal that tunes the demodulator to the desired carrier frequency. A processor instructs the synthesizer to change the carrier frequency so that the demodulator demodulates the multiple bands of data and the radar signals over the desired spectrum.

6192088, Feb 20, 2001

Mar 31, 1998

9/052455

Ahmad K. Aman - Fairfax VA
Cecil William Farrow - Highlands Borough NJ
Hong Jiang - Montclair NJ
Agesino Primatic - Frenchtown NJ
Charles Albert Webb - Rumson Borough NJ

Lucent Technologies Inc. - Murray Hill NJ

H04L 2714
H04L 2716
H04L 2722

375326

A digital carrier recovery system includes at least two modes of operation, namely, an acquisition mode and a tracking mode. The bandwidth of the carrier recovery loop filter is different for the acquisition mode and the tracking mode. In the acquisition mode, the digital phase-locked loop seeks and locks to the long term frequency offset of the received carrier signal. In the tracking mode, the digital phase-locked loop tracks the instantaneous variations in the carrier phase. Switching between the acquisition mode and the tracking mode is realized digitally, and includes programmable hysteresis, resulting in optimal performance in the presence of signals having high levels of phase noise (jitter). More specifically, the carrier recovery loop filter "locks" to the pilot signal of an incoming signal, e. g. , a vestigial side band (VSB) video signal, by employing a so-called digital vector tracking phase-locked loop that demodulates the VSB signal.

6134276, Oct 17, 2000

Mar 31, 1998

9/052454

Ahmad K. Aman - Fairfax VA
Cecil William Farrow - Highlands Borough NJ
Hong Jiang - Montclair NJ
Agesino Primatic - Frenchtown NJ
Charles Albert Webb - Rumson Borough NJ

Lucent Technologies Inc. - Murray Hill NJ

H04L 2714

375326

A digital timing recovery system advantageously employs both demodulated I-phase and Q-phase components to more accurately locate the synchronization signal of an incoming VSB signal. The Q-phase component is advantageously employed to detect the phase error. The use of the Q-phase component provides a more accurate measure of the phase error and results in a larger (wider) acquisition range for timing frequency offset. More specifically, the timing recovery system of this invention performs symbol clock recovery based on the VSB signal segment synchronization (sync) signal and generates a pulse density modulated (PDM) phase difference signal that controls a voltage controlled crystal oscillator (VCXO) in the phase-locked loop. This is realized, in one embodiment of the invention, by correlating received sync segment data with the known sync signal pattern and searching for "peaks" in the correlation values that are periodic at the known sync segment data rate. Once the sync pattern is found, the correlation values for adjacent samples are advantageously employed to generate the necessary feedback control signal value for the VCXO.

6178530, Jan 23, 2001

Apr 24, 1998

9/065854

Ahmad K. Aman - Fairfax VA
Hermann J. Weckenbrock - Bordentown NJ

Lucent Technologies Inc. - Murray Hill NJ

G11C 2900

714702

A memory addressing scheme suitable for use for either interleaving or de-interleaving data bytes of, e. g. , a broadcast digital television (DTV) data stream. A number of memory branches are configured in a random access memory (RAM), wherein at least some of the branches have different numbers of memory locations for reading out and for storing data bytes, thus defining memory branches of different lengths in the RAM. A start address is determined for each of the memory branches in the RAM, corresponding to a first memory location of each branch. An offset value is determined for each memory branch, to be added to the start address for the branch for addressing a memory location of the branch. If an offset value does not exceed the length of a corresponding branch, an address corresponding to the sum of the branch start address and the offset value is generated for addressing a successive memory location of the branch, and the offset value for the branch is incremented by one. When an offset value equals the length of a corresponding branch, an address corresponding to a last memory location of the branch is generated, and the offset value for the branch is reset to zero.