Chuanhui Ma from Princeton, NJ, age 59

Bandwidth Efficient Coding For An Orthogonal Frequency Multiplexing Ofdm System
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US Patent:

8130851, Mar 6, 2012
Filed:

Sep 24, 2008
Appl. No.:

12/236840
Inventors:

Chuanhui Ma - Princeton NJ, US
Ting Wang - West Windsor NJ, US
Assignee:

NEC Laboratories America, Inc. - Princeton NJ
International Classification:

H04B 15/00
H04K 1/02
H04L 25/03
H04L 25/49
US Classification:

375260, 375285, 375296
Abstract:

A method for encoding an OFDM signal includes pairing two adjacent subcarriers of an OFDM signal as a group, changing a modulated symbol set of the OFDM signal to a modified symbol set for coding the OFDM signal, and providing a modified baseband OFDM signal with an increased frequency separation between the subcarriers and reducing the total number of subcarriers being used for transmission over each OFDM symbol interval.

On-Off Keying - 7-Phase Shift Keying Modulation System And Method For Fiber Communication
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US Patent:

20080266014, Oct 30, 2008
Filed:

Mar 14, 2008
Appl. No.:

12/048451
Inventors:

CHUANHUI MA - PRINCETON NJ, US
TING WANG - PRINCETON NJ, US
Assignee:

NEC LABORATORIES AMERICA, INC. - Princeton NJ
International Classification:

H03C 3/00
US Classification:

332103
Abstract:

A modulation system includes a modulator configured to employ a modulation mechanism on data. The mechanism includes a signal constellation configured to map sub-carriers which include a signal to be modulated. The signal constellation has a plurality of points asymmetrically disposed on a circle about an origin and a point at the origin wherein a number of sub-carriers becomes variable over different symbol intervals. Corresponding demodulators and corresponding methods are also disclosed.

Chuanhui Ma