Bbnt Solutions LLC.

Raytheon Bbn Technologies Corp.

Bbn Technologies Corporation

Bolt Beranek and Newman Inc.

Gte Internetworking Incorporated

Bbn Corporation

Applied Radar, Inc.

Marcos Antonio Bergamo

Robert David Preuss

Brig Barnum Elliott

Subramanian Ramanathan

Salim Estephan Roukos

Herbert Gish

Patrick M Peterson

Alan G Derr

A W Huggins

Patrick Mangan Peterson

Alan Gregory Derr

A method for receiving direct-sequence spread spectrum signals containing a plurality of codes with digital beamforming in a receive array apparatus composed of a plurality of spaced antenna elements coupled to at least one receiver with at least one low noise amplifier, at least one frequency down-converter and at least one analog-to-digital converter and at least one digital signal processing computer or device for said plurality of spaced antenna elements, the method comprising the steps of: receiving said direct-sequence spread spectrum signals in said receive array apparatus, the signals emanating from a plurality of positions or from one or multiple transmitters; multiplying said received signals at each element by a reflecting code to produce reflected signals hereinafter referred to as Element Reflected Signals; combining said Element Reflected Signals forming a common signal for the array; converting said common signal to a convenient intermediary frequency signal; sampling said intermediary frequency-converted signal using said analog-to-digital converter; correlating resulting samples against codes or variations of said codes included in said Element Reflected Signals; demultiplexing said Element Reflected Signals to corresponding signals as received by each of said different array antenna elements using said correlated samples.

Array antenna system and spread spectrum beamformer method

The systems and methods described herein include, among other things, processes for providing low latency packet transport in ad hoc networks. To this end, the systems, in certain embodiments, employ an architecture for communication nodes in MANETs, in which the delay introduced in 'routing' or 'relaying' the packet is reduced. In these systems invention, the data plane of the OSI stack at relay nodes is collapsed so that bits entering the node are re-energized &#x201c;on-the-fly&#x201d;, with only a brief pause. A transit key in each packet, inserted by the originator of the packet, is used to index into a transit table to determine one of three actions to perform&#x2014;drop, keep, or retransmit the packet. A control plane determines, for each packet, whether it should be re-energized or not. The control algorithm ensures that only nodes along the path from the source to the destination re-energize (relay) the packet.

Ultra-low latency packet transport in ad hoc networks

A burst of data in a wireless network includes a preamble [], a postamble [] and one or more blocks of data []. A low or no power receiving device [] receives the preamble []. When the preamble [] includes an ID of the receiving device, structural information of the burst is derived from the preamble [], indicating when at least one component of the device is to be powered on to receive the at least one block of data [] included in the burst. The at least one component [] is powered on at a first time period in order to receive the data in the one or more blocks of data. The at least one component [] is powered off at a specific time period from a beginning of the first time period. The powering on and off are repeated for each of the one or more blocks of data [] in the burst.

Battery-conserving transmission and encoding method for wireless ad hoc networks

A data communications system, particularly suited for shared or wireless communications channels, capable of accommodating terminals having different throughput capabilites by flexibly allocating cyclically rotated phases of a common code is disclosed. One or more shifts of a cyclic orthogonal code are assigned to a terminal. These codes are preferably cyclically padded to increase their tolerance to arbitrary time shifts, and the resulting codes are used to spread the signals for transmission.

Data communications system and hybrid time-code multiplexing method

A system ( ) receives a transmitted optical signal and generates an orthogonal despreading code that is different than the code used to spread the transmitted signal. The system ( ) then despreads the received signal using the despreading code. By using a code to despread the received signal that is different than the code used to spread the signal, the overall interference in the system can be reduced and even eliminated.

Asymmetric orthogonal codes for optical communications

A method includes receiving a transmitted signal and generating an orthogonal despreading code that is different than the code used to spread the transmitted signal. The method then despreads the received signal using the orthogonal despreading code. By using a code to despread the received signal that is different than the code used to spread the signal, the overall interference in the system ( ) can be reduced.

Asymmetric orthogonal codes for wireless system receivers with multiplication-free correlators

The data communications systems disclosed herein accommodates terminals having different throughput capabilities by flexibly allocating cyclicly rotated phases of a common pseudo-noise (P/N) code. Throughput capabilities of the terminals are expressible in multiples of a preselected minimum throughput rate so that a single respective code phase is assigned to any terminal operating at the minimum throughput rate while a plurality of sequential consecutive phases are assigned to each terminal having a capability greater than the minimum throughput rate. One or more unassigned phases are provided between phases assigned to different terminals. Any terminal operating at the minimum throughput rate utilizes all time slot intervals in a predetermined frame interval while terminals of greater capability are assigned time slots in accordance with the amount of data traffic to be carried by that terminal and the number of code phases assigned thereto.

Wireless data communications system

A code signal representing a sequence of code symbols carrying digital information is generated with the frequency components of the code signal being essentially confined to a preselected signalling band lying within the bandwidth of an audio signal within which the code signal is to be embedded. The audio signal is continuously frequency analyzed over a frequency band encompassing the signalling band and the code signal is dynamically filtered as a function of the analysis thereby to provide a modified code signal with frequency components which are, at each time instant, essentially a preselected small proportion of the levels of the corresponding audio signal frequency components. Accordingly, the modified code signal can be combined with the audio signal to obtain a composite audio signal which is not readily distinguishable from the original audio signal by listening. Furthermore, the digital information can be recovered from the composite audio signal by a procedure which is essentially the compliment of that used to obtain the composite audio signal.

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Wellesley, MA, United States of America

Marcos Antonio Bergamo