Interdigital Patent Holdings, Inc.

Interdigital Technology Corporation

Fred M Schreider

James D Nolan

Robert A DiFazio

Narayan Parappil Menon

John Mathisen McNally

Prabhakar Chitrapu

Alpaslan Demir

Leonid L Kazakevich

Zinan Lin

Amith Vikram Chincholi

Robert T Regis

John Cartmell

Fryderyk Tyra

Francois Periard

Prabhakar R Chiptrapu

Jane Mack

A dynamic spectrum management (DSM) engine may determine the channel quality of one or more channels associated with the DSM engine when packets are not being transmitted over the channels. For example, the DSM engine may trigger a channel quality measurement on a non-primary channel on a condition that a predetermined period of time has lapsed since the last activity associated with the non-primary channel. Channel quality measurement may be triggered via a data sending event on the non-primary channel such as sending a data frame on the non-primary channel. The DSM engine may perform respective quality measurements on multiple channels and store the respective quality values in a database. Time-averaged channel qualities for the channels may be computed based on the stored quality values for computing transmit power distribution of across the channels.

Channel quality measurement and transmit power allocation in a dynamic spectrum management system

A method and apparatus determines a physical location of a wireless infrastructure device. At least one coarse location data from an associated terminal device is determined. Additional coarse location data are stored and accumulated. The device location is considered accurate by determining that enough received coarse location data has been received.

Location determination of infrastructure device and terminal device

A communication system emulator digitally emulates a plurality of signal impairments created by the transmitter and receiver components and communication medium in a typical communication system, for use in evaluating and refining modem design. A variety of linear and non-linear distortion characteristics are impressed on baseband signals between modulators and demodulators to evaluate and refine modem performance without requiring transmission frequency components or communication channel. The emulator comprises transmit modules, receive modules and communication media modules, and can accept or output analog or digital signals. Each module is configurable to allow modeling of simplex or duplex communication, or a common base station with multiple users transmitting or receiving, all configurations with or without communication media impairment emulation. Each module can be configured to add a plurality of linear and non-linear impairments to a baseband signal.

Communication transmission impairment emulator

Growing community of inventors

Commack, NY, United States of America

Fred M Schreider