General Dynamics Decision Systems, Inc.

General Dynamics C4 Systems, Inc.

Keith Charles Palermo

Mike Francis Durkin

Justin Lamar Allen

Ghassan Maalouli

Mark Lawrence Wormley

Keith Matthew Nolan

Michael P La Macchia

John Abel

Brent Ashley Williams

Scott Demarest

In a wireless ad hoc network () of nodes (), a method () of power management entails monitoring () a current traffic load of the network (), and in response to the current traffic load, selecting () a subset () of epochs () within cyclically repeating time windows () for network communication. A message () is communicated () between the nodes () in the network (). The message () identifies the subset () of epochs () for using in communicating network traffic (). Following receipt of the message, each of the nodes () modifies () a transmit capability mode by entering a run state () during the epochs () within the subset () to enable communication of network traffic () and by entering a low power consumption idle state () during the remaining epochs () within the time window ().

Power management in a wireless ad hoc network

An RF receiver () includes a channel estimator (). The channel estimator () includes a channel estimation filter (), error signal generator (), and normalized Least-Mean-Square (NLMS) filter-definition generator. The filter (), error generator () and NLMS filter-definition generator () function together as an adaptive estimator. An error signal () is formed with a received signal (). The filter () filters an estimated transmit signal () constructed from lower confidence decision data () and higher confidence known preamble data (). An adaptive filter definition () is formed in a feedback, loop which minimizes correlation between the estimated transmit signal () and the error signal (). A convergence signal () is modulated in synchronism with the changes between lower and higher confidence data in the estimated transmit signal ().

RF receiver with NLMS channel estimator and method therefor

A software-defined radio () includes a transmitter () having any number of upstream modules () and any number of downstream modules (). The upstream modules () perform signal processing on input signals (), and the downstream modules () provide an RF interface for processed signals (). The upstream modules () and downstream modules () couple to a common intra-transmitter signal transporter (), which may be implemented as a bus. Programmable transmission parameters () which program the downstream modules () to generate a communication signal () exhibiting desired attributes such as frequency and keying are mingled with the processed input signal () in upstream modules () to preserve timing. The programmable transmission parameters () are extracted in downstream modules (), and applied to the communication signal () at the timing specified by position relative to the processed input signal ().

Transmitter having programmable transmission parameters temporally aligned with payload and method therefor

A signal calibrator ( ) for a software-defined communications device ( ) that enables device communications signals to be transmitted in a manner that maximally decouples the calibrator ( ) from the device hardware ( ), and that simplifies the design and reduces the cost of the communications device ( ). The calibrator ( ) includes a software modulator ( ) for generating a nonstop stream of samples including zero valued samples and non-zero valued waveform bursts, and a software demodulator ( ) connected to the software modulator ( ) via a closed loop feedback path ( ) that receives a nonstop stream of samples. The non-zero valued samples create radio emissions. The software demodulator ( ) is for determining a timing error of the transmission sample and for transmitting a timing error correction value to the software modulator ( ) via the closed loop feedback path ( ). The timing error correction value enables the software modulator ( ) to adjust a transmission time of a subsequent waveform burst to compensate for both unknown hardware delays and RF signal propagation delays.

Radio transmission timing calibrator

A flow of data ( ) is regulated in a communication system ( ). A data rate is established in each of a data source ( ) and a data sink ( ). The data ( ) is transmitted by the data source ( ) and written into a buffer ( ) at the source data rate, then read from the buffer ( ) and received by the data sink ( ) at the sink data rate. The level ( ) of data ( ) in the buffer ( ) is monitored, and a rate-control signal ( ) is dispatched to either the data source ( ) or sink ( ) when it is determined the buffer data level ( ) is decreasing or increasing while at a lower or upper data-level threshold ( ), respectively. One of the data rates is adjusted in response to a rate-control signal ( ).

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Higley, AZ, United States of America

Keith Charles Palermo