Chi Ying Chan

US Patent:

7505506, Mar 17, 2009

Filed:

Feb 25, 2005

Appl. No.:

11/067148

Inventors:

Goran Djuknic - Tenafly NJ, US
Chi Chiu Chan - Wayne NJ, US
Robert W. Smid - Wyckoff NJ, US

Assignee:

ITT Manufacturing Enterprises, Inc. - Wilmington DE

International Classification:

H04B 1/00

US Classification:

375130, 375260, 375272, 375285, 375343, 370319, 370320, 370321, 370330, 370335, 370342, 370345, 370347, 342150, 342151, 342152, 342153, 342154, 342155, 333193, 333194, 333195, 333196

Abstract:

A method of generating a composite signal includes the steps of: (a) generating a plurality of sub-carriers, each sub-carrier having a different frequency position in a frequency spectrum; (b) generating a plurality of codes; and (c) forming a plurality of code combinations from the plurality of codes generated in step (b). The method also includes the steps of (d) first modulating each sub-carrier using a respective one of the code combinations formed in step (c) to form a plurality of modulated sub-carriers; and (e) second modulating in-phase and quadrature components of a base carrier using the plurality of modulated sub-carriers to form the composite signal having multiple carriers. The composite signal is a constant envelope signal, and a single sideband signal.

US Patent:

7590756, Sep 15, 2009

Filed:

May 13, 2005

Appl. No.:

11/128355

Inventors:

Chi Chiu Chan - Wayne NJ, US

Assignee:

ITT Manufacturing Enterprises, Inc. - Wilmington DE

International Classification:

G06F 15/173

US Classification:

709238, 709239, 709240, 370225, 370228, 370231, 370235, 370237, 370390, 370389, 370392

Abstract:

A communication node of the present invention automatically transmits original and duplicate packets over different paths in a communications network to improve delivery reliability of the packet and to decrease packet delivery time. A packet is typically marked for reliable transmission by the application layer of a source node, while a routing agent module within the node IP layer processes the marked packets. The marked packets are transmitted over redundant (e. g. , primary and secondary) network paths from the source node to the destination node. The primary path is usually the shortest path between the source and destination nodes, while the secondary path is selected to avoid overlap with the primary path. The application or transport layer of the destination node filters or removes plural copies of received packets.

US Patent:

7787450, Aug 31, 2010

Filed:

Oct 11, 2006

Appl. No.:

11/545587

Inventors:

Chi Chiu Chan - Wayne NJ, US
Amit Patel - Edison NJ, US

Assignee:

ITT Manufacturing Enterprises, Inc - Wilmington DE

International Classification:

H04L 12/28

US Classification:

370389, 370236, 370238

Abstract:

An efficient network formation technique for mobile ad-hoc wireless networks according to the present invention overcomes bandwidth overhead due to generation of database update or Link State Advertisement (LSA) messages in response to changes in certain parameters (e. g. , node group size, etc. ) with respect to both single and plural node group scenarios. The present invention controls flooding of LSA messages triggered by changes in these parameters (e. g. , node group size), thereby reducing overhead traffic during network start-up. This is achieved without impact on message delivery capability and group merge operations. After network start-up is complete and the network is formed, the present invention continues to reduce LSA flooding in a mobile scenario when radios or nodes move into and out of range with one another.

US Patent:

7860151, Dec 28, 2010

Filed:

Apr 10, 2007

Appl. No.:

11/786259

Inventors:

Goran Djuknic - Tenafly NJ, US
Chi Chiu Chan - Wayne NJ, US

Assignee:

ITT Manufacturing Enterprises, Inc. - Wilmington DE

International Classification:

H04B 1/00

US Classification:

375146, 375135, 375260, 375295

Abstract:

A method of generating a multicarrier spread spectrum signal having a constant envelope includes partitioning multiple spreading codes into at least a first portion of spreading codes and a second portion of spreading codes. First and second modulating signals, respectively, are formed from the first and second portions of spreading codes. A first carrier spread spectrum signal is modulated with the first modulating signal to form a first modulated carrier signal, and a second carrier spread spectrum signal is modulated with the second modulating signal to form a second modulated carrier signal. The first and second modulated carrier signals are summed to form the multicarrier spread spectrum signal. The method includes combining spreading codes from the multiple spreading codes using majority voting logic to form the first and second portions of spreading codes.

US Patent:

20130027251, Jan 31, 2013

Filed:

Jul 27, 2011

Appl. No.:

13/191696

Inventors:

Ning Hsing Lu - Clifton NJ, US
Chi Chiu Chan - Wayne NJ, US
Qun Shi - Plainsboro NJ, US

Assignee:

ITT MANUFACTURING ENTERPRISES, INC. - Wilmington DE

International Classification:

G01S 5/02

US Classification:

342451

Abstract:

According to an embodiment of the present invention an emitter geolocation technique determines the geolocation of a radio frequency (RF) emitter using pair-wise line-of-bearing intersections that are derived from signal-to-noise ratios of transmitted signals received at a sensor. The technique may be employed with ground based vehicle or small unmanned air vehicles (UAV), and obtains reliable geolocation estimates of radio frequency (RF) emitters of interest.