Hong Rong Q Jiang

US Patent:

6445752, Sep 3, 2002

Filed:

Feb 12, 1999

Appl. No.:

09/248904

Inventors:

Hong Jiang - Montclair NJ
Paul L. Palmieri - New Providence NJ
Agesino Primatic, Jr. - Frenchtown NJ
Lesley J. Wu - Parsippany NJ
Liangkai Yu - New Providence NJ

Assignee:

Agere Systems Guardian Corp. - Miami Lakes FL

International Classification:

H04L 2714

US Classification:

375326, 375235

Abstract:

A phase tracker receives a signal component x and forms a phase- and gain-corrected signal z. In particular, the phase tracker performs a Hilbert transform of x to produce a quadrature phase component y to form the constellation defined by (x , y ). Consequently, phase rotation and gain adjustment are combined into a linear transform of the constellation defined by (x , y ). The linear transform z =x +y employs two coefficients and. The coefficients and of the linear transform are derived so as to provide an optimal solution according to minimum mean square error. Approximations to the coefficients and of the linear transform may be iteratively determined with a stochastic gradient method. Advantages of employing the phase- and gain-corrected signal z as an I-phase detection result of a demodulator include 1) the phase rotation and gain adjustment are combined into one operation, and 2) the a sine/cosine lookup table is not employed. Including both phase rotation and a gain adjustment may provide for better performance of the demodulator.

US Patent:

6760737, Jul 6, 2004

Filed:

Jan 16, 2001

Appl. No.:

09/760923

Inventors:

Hong Jiang - Warren NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G06F 708

US Classification:

708202

Abstract:

A spatial median filter determines a median of a plurality of values by dividing the plurality of values into a plurality of groups of values. The values in each of the groups are sorted to determine its median. Then, the medians of the plurality of groups are fully sorted. Certain of the sorted values are eliminated from prescribed ones of the groups in accordance with prescribed criteria based on the number of values in the group and the median value of the group values. The remaining values are sorted to determine the median of the plurality of values.

US Patent:

6825853, Nov 30, 2004

Filed:

Mar 26, 2002

Appl. No.:

10/106546

Inventors:

Hong Jiang - Warren NJ
Agesino Primatic, Jr. - Frenchtown NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G09G 502

US Classification:

345604, 345600, 345644, 348441, 348444, 382162, 382167

Abstract:

Color space conversion from a first image definition scheme to a second image definition scheme is realized by utilizing only one step of matrix multiplication and by determining whether determined RGB values are in a valid RGB region and, if not, generating a first modification factor to bring the RGB vector onto or in close proximity to the boundary of the valid RGB region. Then, the first modification factor is employed to modify in a prescribed manner the converted chroma values. In a specific embodiment of the invention, only a single matrix multiplication is employed and the otherwise additional required multiplication and/or division steps are realized by additions and/or subtractions and by employing a prescribed iterative process to bring the RGB values into or close to the valid RGB color space region. The converted chroma values are also modified by associated second modification factors also generated in the iteration process. In another specific embodiment of the invention, the converted chroma values are modified or not during an iteration depending upon whether a factor corresponding to and related to R , G , B is within a specific color space region or not.

US Patent:

7058076, Jun 6, 2006

Filed:

Jul 8, 1999

Appl. No.:

09/349521

Inventors:

Hong Jiang - Westfield NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04J 1/16

US Classification:

370465

Abstract:

A “Wireless INfrastructure Network”(WINN) comprises packet endpoints such as servers, routers, base stations and gateways. No mobile switching center (MSC) is required. Communications between these endpoints is Internet Protocol (IP) based and voice communications between base station endpoints occurs directly without use of an MSC. Each base station comprises a router and converts wireless air interface signaling to a common IP signaling format.

US Patent:

7171460, Jan 30, 2007

Filed:

Aug 6, 2002

Appl. No.:

10/213239

Inventors:

Asawaree Kalavade - Gillette NJ, US
Hong Jiang - Westfield NJ, US
Penny Chen - Basking Ridge NJ, US

Assignee:

Tatara Systems, Inc. - Acton MA

International Classification:

G06F 15/173
G06F 15/16

US Classification:

709223, 709249, 709203

Abstract:

A converged network accessible by client terminals is provided. The converged network includes a wide area network, a local area network, and a gateway linked to the wide area and local area networks. The gateway integrates billing and authentication functions of the wide area and local area networks.

US Patent:

7239632, Jul 3, 2007

Filed:

Jun 17, 2002

Appl. No.:

10/173084

Inventors:

Asawaree Kalavade - Gillette NJ, US
Hong Jiang - Westfield NJ, US
Penny Chen - Basking Ridge NJ, US

Assignee:

Tatara Systems, Inc. - Acton MA

International Classification:

H04L 12/28
H04L 12/56

US Classification:

370389, 370352, 370354, 370355, 370356, 370329, 370209, 370320, 370332, 370331, 370342, 370340, 455116

Abstract:

A converged network accessible by wireless client devices includes a wide area wireless network, a local area wireless network, and a gateway linked to the wide area and local area wireless networks for integrating access to the networks by the wireless client devices.

US Patent:

7256835, Aug 14, 2007

Filed:

Jun 4, 2004

Appl. No.:

10/860942

Inventors:

Hong Jiang - Warren NJ, US
Kim M. Matthews - Watchung NJ, US
Lesley Jen-Yuan Wu - Parsippany NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04N 7/01

US Classification:

348448, 348452

Abstract:

An apparatus and method for deinterlacing video images is described. In one exemplary implementation, the apparatus receives a video stream in an interlaced format. The apparatus includes a processing system configured to determine whether or not the video stream originated from a progressive format. Based on that determination, the processing system selects one of two modes of operation to deinterlace the video stream: an interpolation mode of operation or a non-interpolation mode of operation.

US Patent:

7266162, Sep 4, 2007

Filed:

Jun 18, 2002

Appl. No.:

10/174417

Inventors:

Hong Jiang - Warren NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04L 27/00

US Classification:

375326, 375322, 375329

Abstract:

A frequency offset estimator is employed that estimates the frequency offset in signal frames that include only binary Phase-Shift Keying (BPSK) carriers in OFDM systems. Specifically, the offset frequency estimator takes advantage of those OFDM systems in which some OFDM symbols only have carriers with either zero or the BPSK constellations. In many WLAN systems such as the system described in standard IEEE802. 11, transmission frames include only BPSK symbols, which are used for training and other services. By making use of these BPSK symbols in each frame, a very accurate estimate of frequency offset can be obtained. By advantageously employing the frequency offset estimator of this invention, a carrier recovery system can achieve high performance even under strong ISI and low SNR. In a specific embodiment of the invention, BPSK carriers spread to be on a line in a complex plane at an angle to the real axis. An estimate of the angle of the line including the BPSK carriers is then employed to obtain an estimate of the frequency offset.