Myung W Lee

US Patent:

7103279, Sep 5, 2006

Filed:

Jul 15, 2002

Appl. No.:

10/196568

Inventors:

Christopher T. Koh - South Deerfield MA, US
Wyley Robinson - Andover MA, US
Myung K. Lee - South Deerfield MA, US
Eric L. Holzman - Sunderland MA, US
Kenneth Michael Pergola - Richmond MA, US

Assignee:

YDI Wireless, Inc. - Northampton MA

International Classification:

H04B 10/00

US Classification:

398115, 398185, 398205, 370314

Abstract:

An apparatus for a wireless transmission of high data rate signals such as received from an optical interface including gigabit fiber channel or a sonet. The architecture combines direct detection of the optical signal with clock and data recovery circuit and a differential signal encoder which is preferably a differential quadrature phase shift encoder and modulator pair. A millimeter wave, local oscillator and up conversion chain converts the optical input signal to a microwave carrier. In the opposite direction, the down converted signal is non-coherently phase detected and fed to a pair of synchronized clock and data recovery circuits to recover I and Q channel signals. These recovered signals are then combined prior to re-timing before they are fed back to the optical transceiver.

US Patent:

20030061614, Mar 27, 2003

Filed:

Sep 24, 2001

Appl. No.:

09/961801

Inventors:

Kenneth Wood - Hadley MA, US
Christopher Koh - South Deerfield MA, US
Myung Lee - South Deerfield MA, US
Eric Holzman - Sunderland MA, US
Wayne Pleasant - Turners Falls MA, US

Assignee:

Telaxis Communications Corporation - South Deerfield MA

International Classification:

H04H001/00
H04N007/20

US Classification:

725/073000, 455/003010, 455/003050

Abstract:

A point-to-point microwave radio link that operates in a Frequency Division Duplex (FDD) mode using direct digital modulation with an ON-OFF Keyed (OOK) scheme. The transmit signal is generated by a circuit that uses an oscillator operating in a microwave radio band. The oscillator output is switched at the input bit rate. The output of the switched oscillator is then frequency multiplied by the predetermined factor to produce the modulated microwave output signal at the desired band.