Charles C Chang

Author:

Charles Chang

ISBN #:

0863531792

US Patent:

20070014572, Jan 18, 2007

Filed:

Apr 13, 2005

Appl. No.:

11/106274

Inventors:

Gilberto Sada - Irvine CA, US
Keith Jones - Irvine CA, US
Charles Chang - Coto de Caza CA, US

International Classification:

H04B 10/08

US Classification:

398027000

Abstract:

A method and system for a bit error rate (BER) contour-based optimum decision threshold and sampling phase selection in optical communication systems is disclosed. According to one aspect of the invention, for a selected sampling phase and a decision threshold, high BER values are measured. Low BER values are approximated from the high BER values using error functions. The procedures are repeated for all selected sampling phases and decision thresholds and corresponding BER values are calculated. The sampling phases and decision thresholds for each specific BER value are plotted to create the BER contour diagrams. The optimum decision threshold for a sampling phase is calculated by equating the BER due to marks (“s”) and the BER due to spaces (“s”). In one aspect of the invention, a BER test module resides in the receiver. The BER test module calculates the BERs and the optimum decision threshold and sampling phase.

US Patent:

20220366761, Nov 17, 2022

Filed:

Aug 1, 2022

Appl. No.:

17/878737

Inventors:

- Monterey Park CA, US
Charles Chang - South Pasadena CA, US

International Classification:

G07F 17/32
G06N 20/00
G06F 16/9535
G06F 16/435
H04L 67/60
H04L 67/131

Abstract:

A database system is disclosed for accessing databases, updating hands information associated with users. The database system can include a server. The server can retrieve and store data in the database. The server can retrieve a first request from a first computer over a network, the first request including a first set of authentication data. The server can identify the user and retrieve a first set of hands information data associated with the user from the database. The server can generate a first set of game data and transmit the game data to the first computer. It can then receive a first set of hands data from the first computer. It can compute a first game result based on the first set of hands data, the first set of game data and a first set of game rules.

US Patent:

20200105094, Apr 2, 2020

Filed:

Jun 14, 2019

Appl. No.:

16/442322

Inventors:

Wayne Chiang - Monterey Park CA, US
Charles Chang - South Pasadena CA, US

International Classification:

G07F 17/32
H04L 29/06
G06N 20/00
H04L 29/08
G06F 16/9535
G06F 16/435

Abstract:

A database system is disclosed for accessing databases, updating hands information associated with users. The database system can include a server. The server can retrieve and store data in the database. The server can retrieve a first request from a first computer over a network, the first request including a first set of authentication data. The server can identify the user and retrieve a first set of hands information data associated with the user from the database. The server can generate a first set of game data and transmit the game data to the first computer. It can then receive a first set of hands data from the first computer. It can compute a first game result based on the first set of hands data, the first set of game data and a first set of game rules.

US Patent:

20180293840, Oct 11, 2018

Filed:

Apr 6, 2017

Appl. No.:

15/481348

Inventors:

Wayne Chiang - Monterey Park CA, US
Charles Chang - Alhambra CA, US

International Classification:

G07F 17/32
H04L 29/08
H04L 29/06
G06N 99/00
G06N 5/02

Abstract:

A database system is disclosed for accessing databases, updating hands information associated with users. The database system can include a server. The server can retrieve and store data in the database. The server can retrieve a first request from a first computer over a network, the first request including a first set of authentication data. The server can identify the user and retrieve a first set of hands information data associated with the user from the database. The server can generate a first set of game data and transmit the game data to the first computer. It can then receive a first set of hands data from the first computer. It can compute a first game result based on the first set of hands data, the first set of game data and a first set of game rules.