Steven Michael Jaffe

US Patent:

6411659, Jun 25, 2002

Filed:

Oct 20, 2000

Appl. No.:

09/692805

Inventors:

Tian-Min Liu - Liguna Niguel CA
Loke Kun Tan - Liguna Niguel CA
Steven T. Jaffe - Irvine CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04L 2714

US Classification:

375326, 375355, 348725

Abstract:

Improved carrier recovery and symbol timing systems and methods suitable for use in connection with a dual-mode QAM/VSB receiver system is disclosed. Carrier and symbol timing acquisition and tracking loops are phase/frequency locked to an inserted pilot signal provided in an input VSB spectrum at a given frequency. An input spectrum is centered about baseband and the pilot is extracted by an equivalent filter which functions as a bandpass filter having pass bands centered about the pilot frequency. Since the pilot signals frequency is given, its position in the frequency domain for any sampling frequency, is deterministic. The receivers sampling frequency is provided such that the relationship is expressed as f =f. When tracked by a phase-lock loop, the pilot signal will appear at the correct location in the spectrum if the sampling frequency f is correct, and will be shifted in one direction or the other if the sampling frequency f is too high or too low.

US Patent:

6518892, Feb 11, 2003

Filed:

Jul 6, 2001

Appl. No.:

09/900222

Inventors:

Kelly B. Cameron - Irvine CA
Steven T. Jaffe - Irvine CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03M 700

US Classification:

341 50, 714786

Abstract:

Method and apparatus for determining the stopping point of an iterative decoding process. In one embodiment the estimated values of an iteration of an iterative decoder are provided to a signature circuit. If the signature does not differ from the previous signature developed from a prior iteration, or the signature developed from an iteration prior to the previous iteration, the decoding stops. The variance may also be tested and compared to a threshold as a criteria to stop the iterative decoding.

US Patent:

6553063, Apr 22, 2003

Filed:

Oct 29, 1999

Appl. No.:

09/430466

Inventors:

Thuji Simon Lin - Irvine CA
Steven Jaffe - Irvine CA
Robindra Joshi - Redondo Beach CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04L 516

US Classification:

375223, 375225, 375261, 375285, 375298, 375340

Abstract:

A device of dynamic communication of information allows, on the average, non-integer bits per symbol transmission, using a compact code set or a partial response decoding receiver. A stream of k or k+1 data bits is grouped into bit vectors which then are mapped onto corresponding signal constellations forming transmission symbols. Two or more symbols can be grouped and further encoded, so that a symbol is spread across the two or more symbols being communicated. Sequence estimation using, for example, maximum likelihood techniques, as informed by noise estimates relative to the received signal. Each branch metric in computing the path metric of a considered sequence at the receiver is weighted by the inverse of the noise power. It is desirable that the constellation selection, sequence estimation and noise estimation be performed continuously and dynamically.

US Patent:

6686853, Feb 3, 2004

Filed:

Aug 15, 2002

Appl. No.:

10/219858

Inventors:

Kelly B. Cameron - Irvine CA
Steven T. Jaffe - Irvine CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03M 700

US Classification:

341 50, 341 67, 714760, 714786

Abstract:

Method and apparatus for determining the stopping point of an iterative decoding process. In one embodiment the estimated values of an iteration of an iterative decoder are provided to a signature circuit. If the signature does not differ from the previous signature developed from a prior iteration, or the signature developed from an iteration prior to the previous iteration, the decoding stops. The variance may also be tested and compared to a threshold as a criteria to stop the iterative decoding.

US Patent:

6693566, Feb 17, 2004

Filed:

Dec 4, 2000

Appl. No.:

09/729442

Inventors:

Steven T. Jaffe - Irvine CA
Kelly B. Cameron - Irvine CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03M 700

US Classification:

341 50, 341 94, 714755, 714786, 714774, 375259, 375341, 375222

Abstract:

A communications system, having a combination Reed-Solomon encoder and a Turbo-Code encoder Data frame configuration which may be changed to accommodate embedded submarkers of known value are embedded in with the data order to aid synchronization in the receiver system, by providing strings of known symbols. The string of known symbols may be the same as the symbols within a training header that appears at the beginning of a data frame. Frame parameters may be tailored to individual users and may be controlled by information pertaining to receivers, such as bit error rate, of the receiver. Additional headers may be interspersed within the data in order to assist in receiver synchronization. Frames of data may be acquired quickly by a receiver by having a string of symbols representing the phase offset between successive header symbols in the header training sequence in order to determine the carrier offset. Phase lock to a signal may achieved after determining carrier offset in receivers by correlating successive symbols in successive headers.

US Patent:

6828926, Dec 7, 2004

Filed:

Apr 12, 2004

Appl. No.:

10/822403

Inventors:

Steven T. Jaffe - Irvine CA
Kelly B. Cameron - Irvine CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03M 700

US Classification:

341 81, 341 50, 341 94, 714755, 714774, 375341, 375222

Abstract:

A communications system, having a combination Reed-Solomon encoder and a Turbo-Code encoder Data frame configuration which may be changed to accommodate embedded submarkers of known value are embedded in with the data order to aid synchronization in the receiver system, by providing strings of known symbols. The string of known symbols may be the same as the symbols within a training header that appears at the beginning of a data frame. Frame parameters may be tailored to individual users and may be controlled by information pertaining to receivers, such as bit error rate, of the receiver. Additional headers may be interspersed within the data in order to assist in receiver synchronization. Frames of data may be acquired quickly by a receiver by having a string of symbols representing the phase offset between successive header symbols in the header training sequence in order to determine the carrier offset. Phase lock to a signal may achieved after determining carrier offset in receivers by correlating successive symbols in successive headers.

US Patent:

6842495, Jan 11, 2005

Filed:

Nov 3, 1999

Appl. No.:

09/433730

Inventors:

Steven T. Jaffe - Irvine CA, US
Tian-Min Liu - Laguna Niguel CA, US
Loke Kun Tan - Laguna Niguel CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04L 2722

US Classification:

375326, 329304

Abstract:

A television receiver system capable of receiving and demodulating television signal information content that has been modulated and transmitted in accordance with a variety of modulation formats is disclosed. In particular, the system is able to accommodate receipt and demodulation of at least 8 and 16-VSB modulated signals in order to support US HDTV applications, as well as 64 and 256-QAM modulated signals, for European and potential US CATV implementations. The system includes carrier and timing recovery loops adapted to operate on an enhanced pilot signal as well as decision directed carrier phase recovery loops. Phase detectors operate on I and Q rail signals, or generate a Q rail from a Hilbert transform of the I rail. Decision directed loops incorporate a trellis decoder in order to operate on sequence estimated decisions for improved reliability in poor SNR environments.

US Patent:

6891485, May 10, 2005

Filed:

Nov 7, 2003

Appl. No.:

10/703286

Inventors:

Steven T. Jaffe - Irvine CA, US
Kelly B. Cameron - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03M007/00
H04Q007/38

US Classification:

341 81, 341 94, 341 50, 370341, 370342, 375265, 375341, 375259, 375222, 714786, 714774

Abstract:

A communications system, having a combination Reed-Solomon encoder and a Turbo-Code encoder Data frame configuration which may be changed to accommodate embedded submarkers of known value are embedded in with the data order to aid synchronization in the receiver system, by providing strings of known symbols. The string of known symbols may be the same as the symbols within a training header that appears at the beginning of a data frame. Frame parameters may be tailored to individual users and may be controlled by information pertaining to receivers, such as bit error rate, of the receiver. Additional headers may be interspersed within the data in order to assist in receiver synchronization. Frames of data may be acquired quickly by a receiver by having a string of symbols representing the phase offset between successive header symbols in the header training sequence in order to determine the carrier offset. Phase lock to a signal may achieved after determining carrier offset in receivers by correlating successive symbols in successive headers.

Author:

Steven Jaffe

ISBN #:

0759682860

Author:

Steven H. Jaffe

ISBN #:

0805031022

Author:

Steven L. Jaffe

ISBN #:

0791051730

Author:

Steven L. Jaffe

ISBN #:

0791051773

Author:

Steven L. Jaffe

ISBN #:

0791052036

Author:

Steven L. Jaffe

ISBN #:

0791052044

Author:

Steven L. Jaffe

ISBN #:

0791052060