Joseph J Fine, 421664 Wolff St, Denver, CO 80204

6389088, May 14, 2002

Feb 22, 2000

09/510496

Gary Vincent Blois - Towaco NJ
Joseph Michael Fine - West Caldwell NJ
Marvin A. Epstein - Monsey NY

ITT Manufacturing Enterprises, Inc. - Wilmington DE

H04L 700

375355, 375226, 375343, 375368

There is disclosed a bit sync search and frame sync search system operative with a digital data signal as transmitted by a digital radio transmitter. The bit search is implemented by detecting a predetermined phasing signal which is incorporated in the digital signal and which has a repetitive bit pattern of ones and zeroes. The phasing signal is first detected by providing an in-phase and quadrature component signal and correlating those signals to provide an output signal indicative of the bit pattern in the phasing signal. After the phasing signal has been provided and an oscillator associated with a receiving apparatus is compensated according to the detected phasing signal, a tracking mode is entered, whereby a frame signal is captured and the system generates histograms of data bit transitions for producing an error signal indicative of the difference of the transmitted clock rate and the sampling portion of a received bit. In this manner, by adjusting the clock according to the error signal produced by the histogram process one can be assured that the sampling rate at the receiver will occur relatively at the center of each bit to therefore provide reliable decoding or detection of the received digital data signal in the presence of the noise.

6137828, Oct 24, 2000

Aug 16, 1999

9/375064

Marvin A. Epstein - Monsey NY
Gary V. Blois - Towaco NJ
Joseph M. Fine - West Caldwell NJ

ITT Manufacturing Enterprises, Inc. - Wilmington DE

H04L 516

375219

There is disclosed in a digital communications system for communicating between two radios by transceiving a signal comprising a first type control signal, a second type data traffic signal and a third type voice signal, a remote communication interface for providing transmission therebetween comprising a duplexer/bridge network for transceiving the signal, means for determining the signal type to be transmitted, low pass filters and analog to digital and digital to analog converters for processing received and transmitted signals, and a digital signal processor for modulating and demodulating the signal for transmission/reception according to the signal type. There is also disclosed means for adjusting the clock sampling frequency during the demodulation process to obtain bit sync, bit tracking and frequency tracking. The communication interface is operable to transceive either the modulated traffic, control, or voice signal, or combined modulated traffic and control signal, or combined modulated voice and control signal.

5970086, Oct 19, 1999

May 22, 1997

8/861606

Marvin A. Epstein - Monsey NY
Gary V. Blois - Towaco NJ
Joseph M. Fine - West Caldwell NJ

ITT Manufacturing Enterprises - Wilmington DE

H04B 138
H04J 304
H04L 12403
H04Q 720

375219

In a digital communications system for communicating between two radios by transceiving a signal comprising a first type control signal, a second type data traffic signal, and a third type voice signal, a remote communication interface for providing transmission therebetweeen comprising a duplexer bridge network for transceiving the signal, low pass filters, and analog to digital and digital to analog converters for processing received and transmitted signals respectively, and a digital signal processor for modulating and demodulating the signal for transmission or reception according to the signal type. A control signal output from the digital signal processor enables adjustment of the clock sampling frequency during the reception and demodulation process to obtain bit sync, bit tracking and frequency tracking. The communication interface is operable to transceive either the modulated traffic, control, or voice signal, or combined modulated traffic and control signal, or combined modulated voice and control signal.

6052423, Apr 18, 2000

Jul 8, 1999

9/349077

Gary Vincent Blois - Towaco NJ
Joseph Michael Fine - West Caldwell NJ
Marvin A. Epstein - Monsey NY

ITT Manufacturing Enterprises, Inc. - Wilmington DE

H04L 700

375355

There is disclosed a bit sync search and frame sync search system operative with a digital data signal as transmitted by a digital radio transmitter. The bit search is implemented by detecting a predetermined phasing signal which is incorporated in the digital signal and which has a repetitive bit pattern of ones and zeroes. The phasing signal is first detected by providing an in-phase and quadrature component signal and correlating those signals to provide an output signal indicative of the bit pattern in the phasing signal. After the phasing signal has been provided and an oscillator associated with a receiving apparatus is compensated according to the detected phasing signal, a tracking mode is entered, whereby a frame signal is captured and the system generates histograms of data bit transitions for producing an error signal indicative of the difference of the transmitted clock rate and the sampling portion of a received bit. In this manner, by adjusting the clock according to the error signal produced by the histogram process one can be assured that the sampling rate at the receiver will occur relatively at the center of each bit to therefore provide reliable decoding or detection of the received digital data signal in the presence of the noise.

6002728, Dec 14, 1999

Apr 17, 1997

8/837353

Gary Vincent Blois - Towaco NJ
Joseph Michael Fine - West Caldwell NJ
Marvin A. Epstein - Monsey NY

ITT Manufacturing Enterprises Inc. - Wilmington DE

H04L 700

375355

There is disclosed a bit sync search and frame sync search system operative with a digital data signal as transmitted by a digital radio transmitter. The bit search is implemented by detecting a predetermined phasing signal which is incorporated in the digital signal and which has a repetitive bit pattern of ones and zeroes. The phasing signal is first detected by providing 94 in-phase and quadrature component signals and correlating those signals to provide an output signal indicative of the bit pattern in the phasing signal. After the phasing signal has been provided and an oscillator associated with a receiving apparatus is compensated according to the detected phasing signal, a tracking mode is entered, whereby a frame signal is captured and the system generates histograms of data bit transitions for producing an error signal indicative of the difference of the transmitted clock rate and the sampling portion of a received bit. In this manner, by adjusting the clock according to the error signal produced by the histogram process one can be assured that the sampling rate at the receiver will occur relatively at the center of each bit to therefore provide reliable decoding or detection of the received digital data signal in the presence of the noise.

6052406, Apr 18, 2000

May 2, 1997

8/850231

Marvin A. Epstein - Monsey NY
Gary V. Blois - Towaco NJ
Joseph M. Fine - West Caldwell NJ

ITT Manufacturing Enterprises, Inc. - Wilmington DE

H04K 100
H04K 104
H04L 2730
H04L 700

375202

There is disclosed an improved frequency hopping synchronization and tracking system for bit syncing and frame syncing a digital data signal as transmitted by a radio transmitter. A detection means responsive to incoming data samples representative of the phasing signal portion of the digital data signal partitions the data samples into alternating first and second sample sequences and correlates the samples against a frequency hop modulation code reference sequence to provide an initial data signal detection. A post-detection means responsive to the initial detection and to the frequency hop modulation code reference sequence correlates the incoming data samples and compares the spectral power of the correlated data samples to a threshold value to provide bit sync of the detected data signal. Tracking means responsive to the bit sync and to the input samples captures a frame signal and generates histograms of data bit transitions for producing an error signal indicative of the difference of the transmitted clock rate and the sampling position of the received bit. A clock means responsive to the error signal produced by the histogram process can be adjusted according to the error signal to enable sampling of each received data bit to occur relatively at the center of each bit to ensure reliable decoding or detection of a digital data signal in a noisy channel at the receiver.

5881096, Mar 9, 1999

Jun 5, 1997

8/869583

Bryan S. Majkrzak - Clifton NJ
John Bertrand - Upper Nyack NY
Marvin A. Epstein - Monsey NY
Gary V. Blois - Towaco NJ
Joseph M. Fine - West Caldwell NJ

ITT Manufacturing Enterprises, Inc. - Wilmington DE

H04B 1500
H04K 100
H04L 2730

375202

There is disclosed in a frequency hopping digital communications system having a transmitter for transmitting a data signal via a noisy transmission path, and a receiver responsive to the transmitted signal for receiving the same, a method for removing bias in the data signal at the receiver comprising the steps of: forming a sample amplitude histogram from the received data signal samples for a given hop frequency; correlating the amplitude histogram against a stored reference amplitude histogram to obtain a correlated output signal having a peak correlation position; determining the position difference between the peak correlation position and the correlation center position to provide an offset signal corresponding to the difference and indicative of an estimated bias offset value; and applying the estimated bias offset value to the received signal samples in response to the offset signal to obtain an output signal indicative of an unbiased received data signal.

6018543, Jan 25, 2000

May 21, 1997

8/861604

Gary V. Blois - Towaco NJ
Joseph M. Fine - West Caldwell NJ
Marvin A. Epstein - Monsey NY

ITT Manufacturing Enterprises, Inc. - Wilmington DE

H04B 1500
H04B 126

375202

There is disclosed in a frequency hopping digital communication network having a multimode radio transmitter for transmitting a data signal and a multimode radio receiver tuned for receiving the same, the multimode transmitter and receiver operable in a first standard mode and a second enhanced mode, each mode having a late-net acquisition library period and an in-net acquisition library period, a method for obtaining a non-noisy frequency channel over which to receive the data signal transmitted across the radio network. The method comprises the steps of successively averaging signal samples received over a particular frequency channel and time interval corresponding to the receiver mode and library period to determine the noise level of the particular reception frequency channel. The averaged signal samples are then compared to a predetermined noise threshold to determine whether the frequency channel is noisy. If the frequency channel is determined to be noisy, the receiver is tuned to a new reception frequency channel, the new frequency channel being selectable from a group of permissible frequency channels and responsive to the receiver mode and library period and in a predetermined sequence.