John B Kowalski

US Patent:

6674788, Jan 6, 2004

Filed:

Feb 27, 2002

Appl. No.:

10/083846

Inventors:

Gary Lomp - Centerpot NY
Fatih Ozluturk - Port Washington NY
John Kowalski - Hempstead NY

Assignee:

InterDigital Technology Corporation - Wilmington DE

International Classification:

H04B 169

US Classification:

375130, 375146, 455522, 455 69, 370342

Abstract:

A method and apparatus for communication data signal blocking for a base radio control station (RCS) which wirelessly communicates with subscriber units (SUs) via a spread spectrum communication system is disclosed. A transmitter sends signals as a baseband combined signal over global and assigned channels to SUs. The SUs are set to initial power levels and the power levels are adjusted in advance of receiving signals on assigned channels. The power levels are combined to define an RCS transmitter power level, which is preferably a root mean square value of the baseband combined signal. The transmission power levels are adjusted in response to corresponding power control signals received from the SUs. Transmission of a new communication data signal on an assigned channel is blocked if a predetermined RCS transmitter power level limit is reached before commencing transmission of that signal.

US Patent:

6707805, Mar 16, 2004

Filed:

Dec 21, 2000

Appl. No.:

09/742019

Inventors:

Fatih M. Ozluturk - Port Washington NY
Gary R. Lomp - Centerport NY
John Kowalski - Vancouver WA

Assignee:

InterDigital Technology Corporation - Wilmington DE

International Classification:

H04B 7216

US Classification:

370335, 370342

Abstract:

A code-division-multiple-access (CDMA) system employing spread-spectrum modulation. The CDMA system has a base station (BS), and a plurality of subscriber units (SUs). The signals transmitted between the BS and SU use spread-spectrum modulation. The improvement method for maintaining control of power from an SU to a BS comprises sending from the subscriber unit, using spread-spectrum modulation, a SU-spreading code, and detecting, at the BS, the SU-spreading code from the SU. In response to detecting the SU-spreading code at the BS, a BS-spreading code is sent to the SU, using spread-spectrum modulation. At the SU, if the BS-spreading code is detected, then transmit power of the SU is reduced. If the BS-spreading code is not detected at the SU, then transmit power of the SU is increased.

US Patent:

6788662, Sep 7, 2004

Filed:

Feb 21, 2001

Appl. No.:

09/789830

Inventors:

Faith M. Ozluturk - Port Washington NY
Gary R. Lomp - Centerport NY
John Kowalski - Vancouver WA

Assignee:

InterDigital Technology Corporation - Wilmington DE

International Classification:

H04B 7216

US Classification:

370335, 455 69

Abstract:

A code-division-multiple-access (CDMA) system employing spread-spectrum modulation. The CDMA system has a base station (BS), and a plurality of subscriber units. The signals transmitted between the base station and subscriber unit use spread-spectrum modulation. The improvement method for adaptive reverse power control (APC) from a subscriber unit (SU) to a base station (BS), comprises the steps of sending from the subscriber unit, using spread-spectrum modulation, a SU-spreading code on a reverse channel. The base station despreads the SU-spreading code on the reverse channel as a despread signal, determines a first power level P which includes power of the despread signal plus noise and a second power level P , which includes despread-noise power. The base station determines a first error signal e , from the first power level P , the second power level P , and a required signal-to-noise ratio SNR for service type, and a second error signal e , from a measure of total received power P at the base station, and an automatic gain control (AGC) set point P. The base station forms a combined error signal from the first error signal e , the second error signal e , a first weight a and a second weight a , and hard limits the combined error signal to form a single APC bit.

US Patent:

6801516, Oct 5, 2004

Filed:

Aug 9, 2000

Appl. No.:

09/635986

Inventors:

Gary Lomp - Centerpot NY
John Kowalski - Hempstead NY
Fatih Ozluturk - Port Washington NY
Avi Silverberg - Commack NY
Robert Regis - Huntington NY
Michael Luddy - Sea Cliff NY
Alexander Marra - New York NY
Alexander Jacques - Mineola NY

Assignee:

InterDigital Technology Corporation - Wilmington DE

International Classification:

H04B 7216

US Classification:

370342, 370335, 370465

Abstract:

A spread-spectrum system having an assignor, a spread-spectrum processor, a call processor, and an information-channel-mode modifier. The assignor assigns each information signal arriving at the spread-spectrum system to a message-code signal. Each of the message-code signals supports a pre-determined information-channel rate. Several information signals have different channel rates, and each information signal is assigned according to the required channel rate. The spread-spectrum processor generates a pilot-code signal, and spread-spectrum processes the information signals with the message-code signals to generate a plurality of spread-spectrum processed-message signals, respectively. The message-code signals are synchronized to the pilot-code signal. The call processor provides a call-type signal corresponding to the information signal rate for the several information signals having several different channel rates. In response to the call-type signal, the information-channel-mode modifier changes a combination of the information signals and the message-code signals to support the several different channel rates for the several information signals having several different channel rates.

US Patent:

6816473, Nov 9, 2004

Filed:

Feb 21, 2001

Appl. No.:

09/791025

Inventors:

Fatih M. Ozluturk - Port Washington NY
Gary R. Lomp - Centerport NY
John Kowalski - Vancouver WA

Assignee:

InterDigital Technology Corporation - Wilmington DE

International Classification:

H04B 7216

US Classification:

370335, 370342

Abstract:

A code-division-multiple-access (CDMA) system employing spread-spectrum modulation. The CDMA system has a base station (BS), and a plurality of subscriber units. The signals transmitted between the base station and subscriber unit use spread-spectrum modulation. The improvement method for adaptive forward power control (APC) from a base station (BS) to a subscriber unit (SU), comprises the steps of sending from the base station, using spread-spectrum modulation, a BS-spreading code on a forward channel. The subscriber unit despreads the BS-spreading code on the forward channel as a despread signal, determines a first power level P which includes power of the despread signal plus noise and a second power level P , which includes despread-noise power. The subscriber unit determines a first error signal e , from the first power level P , the second power level P , and a required signal-to-noise ratio SNR for service type, and a second error signal e , from a measure of total received power P and an automatic gain control (AGC) set point P. The subscriber unit forms a combined error signal from the first error signal e , the second error signal e , a first weight a and a second weight a , and hard limits the combined error signal to form a single APC bit.

US Patent:

6831905, Dec 14, 2004

Filed:

Aug 9, 2000

Appl. No.:

09/634400

Inventors:

Gary Lomp - Centerpot NY
John Kowalski - Hempstead NY
Fatih Ozluturk - Port Washington NY
Avi Silverberg - Commack NY
Robert Regis - Huntington NY
Michael Luddy - Sea Cliff NY
Alexander Marra - New York NY
Alexander Jacques - Mineola NY

Assignee:

InterDigital Technology Corporation - Wilmington DE

International Classification:

H04B 7216

US Classification:

370335, 370342

Abstract:

A spread spectrum system having an assignor, a spread-spectrum processor and a transmitter. The assignor assigns each arriving information signal to a message-code signal. Each message-code signal is different then other message-code signals. The spread-spectrum processor generates a pilot code signal and processes the information signals with the message-code signals to generate spread-spectrum process-message signals synchronized to the pilot-code signal. A transmitter combines the spread-spectrum process-message signals and the pilot-code signal to generate a CDM signal. The transmitter modulates the CDM signal with a carrier signal for transmission over the communications channel.

US Patent:

6868076, Mar 15, 2005

Filed:

May 9, 2001

Appl. No.:

09/851740

Inventors:

Donald L. Schilling - Sands Point NY, US
John Kowalski - New York NY, US

Assignee:

InterDigital Technology Corporation - Wilmington DE

International Classification:

H04B007/216

US Classification:

370335, 370342, 370441, 375148

Abstract:

A plurality of channels are received as a received signal. Each channel is associated with a code. For each of the plurality of channels, others of the plurality of channels are subtracted from the received signal and a result of that subtracting is despread as data for that channel.

US Patent:

6868078, Mar 15, 2005

Filed:

Jul 24, 2002

Appl. No.:

10/202179

Inventors:

Donald L. Schilling - Sands Point NY, US
John Kowalski - New York NY, US

Assignee:

InterDigital Technology Corporation - Wilmington DE

International Classification:

H04B007/216

US Classification:

370342, 370441, 375346

Abstract:

A spread-spectrum code division multiple access interference canceller for reducing interference in a direct sequence CDMA, employed at a base station receiver having N chip-code channels. The interference canceller includes a plurality of correlators or matched filters, a plurality of spread-spectrum-processing circuits, subtracting circuits, and channel correlators or channel-matched filters. Using a plurality of chip-code signals, the plurality of correlators despreads the spread-spectrum CDMA signal as a plurality of despread signals, respectively. The spread-spectrum-processing circuits use a timed version of the chip-code signals, for spread-spectrum processing the despread signals, respectively, with a chip-code-signal corresponding to a respective despread signal. For recovering a code channel using an ichip-code-signal, the subtracting circuits subtracts from the spread-spectrum CDMA signal, the N−1 spread-spectrum-processed-despread signals generating a subtracted signal. The N−1 spread-spectrum-processed-despread signals exclude the spread-spectrum-processed-despread signal of the ichannel.