Massimo Sorbara, Jean Jacques Werner: Synchronization scheme for a digital communications system. AT&T Bell Laboratories, David R Padnes, July 19, 1994: US05331670 (38 worldwide citation)

A synchronization scheme for a digital communications system wherein customer data is connected to a synchronous communications network utilizes auxiliary symbols to provide frame synchronization. Each such auxiliary symbol lies outside of a conventional symbol constellation and is only used to repr ...

Joseph B Weinman Jr: Digital coding technique which avoids loss of synchronization. AT&T IPM, Steven R Bartholomew, David R Padnes, October 24, 1995: US05461379 (38 worldwide citation)

Loss of synchronization, due to a digital data signal having the same signal value for an extended number of bit or symbol periods, is overcome through the use of a coding scheme which assures transitions after each such period despite the absence of transitions in the signal to be encoded. Broadly, ...

Jean Jacques Werner: Digital communications synchronization scheme. AT&T Bell Laboratories, David R Padnes, July 28, 1992: US05134633 (37 worldwide citation)

A synchronization scheme for use in digital communications systems selectively replaces data-representative symbols that would ordinarily be transmitted through a plurality of communications channels with associated replacement symbols that represent the data and provide a synchronization mechanism. ...

Noach Amitay, Lawrence J Greenstein: Cross-polarization interference cancellation. AT&T Bell Laboratories, David R Padnes, August 12, 1986: US04606054 (36 worldwide citation)

A canceller for eliminating the cross-polarization interference in incoming signals having polarizations which are orthogonal to one another is proposed. Each incoming signal is coupled to an associated adaptive filter. Each filter output is then summed with an associated one of the incoming signals ...

Peter D Karabinis, Thomas L Osborne: Compensation of filter symbol interference by adaptive estimation of received symbol sequences. AT&T Bell Laboratories, David R Padnes, January 14, 1986: US04564952 (35 worldwide citation)

Compensation for arbitrary combinations of linear and nonlinear distortion is provided by altering a received symbol value by a preselected amount. This amount is based on an estimate of the sequence of transmitted symbol values represented by the received symbol value at a sampling time and a numbe ...

Gang Huang, Gi Hong Im, Jean Jacques Werner: Crosstalk suppression technique. AT&T, David R Padnes, Thomas Stafford, January 9, 1996: US05483551 (35 worldwide citation)

To reduce near-end crosstalk (NEXT) in systems possessing excess bandwidth, a signal is transmitted from a first to a second location. At the second location, the received signal is examined and a characteristic of this signal is determined while the delay provided in the transmit signal path at thi ...

William C Young: Molded optical fiber connectors. Bell Telephone Laboratories Incorporated, David R Padnes, April 28, 1981: US04264128 (35 worldwide citation)

An insert (21) is molded within an optical fiber connector (2,3) to provide more precisely defined and symmetric alignment surfaces (5,6). The insert may be used for connectors directly molded about an optical fiber or for field mountable connectors subsequently affixed thereto. During molding, the ...

Jin Der Wang: Technique for determining signal dispersion characteristics in communications systems. AT&T Bell Laboratories, David R Padnes, November 9, 1993: US05260972 (33 worldwide citation)

The present invention covers the notion of determining signal dispersion characteristics, such as amplitude, phase and delay, by transmitting a training sequence. This training sequence includes a plurality of predetermined symbols and has a time duration at least equal to the expected range of the ...

Kenneth W Leland, Nelson R Sollenberger: Technique for improving radio system performance during fading. AT&T Company, AT&T Bell Laboratories, David R Padnes, April 28, 1987: US04661993 (32 worldwide citation)

A technique for reducing the average fade duration of signals in a radio system by simulating motion of a plurality of transmitting antennas is disclosed. This simulation is accomplished by slowly and continuously varying a characteristic of the modulated carrier signal supplied to the antennas. The ...

Rodney C Alferness: Wavelength tunable TE to TM mode converter. AT&T Bell Laboratories, David R Padnes, August 6, 1985: US04533207 (32 worldwide citation)

An improved wavelength tunable TE to TM optical mode converter is provided by confining the electric fields for mode conversion and wavelength tuning to non-overlapping regions of a bi-refringent waveguide. Several electrode configurations for providing this spatial separation are disclosed.