L-3 Communications Corporation

Michael J Hurst

Thomas R Giallorenzi

Johnny M Harris

Dan M Griffin

Lee A Butterfield

Patrick J Smith

Dennis Carl Pulsipher

Philip L Stephenson

Daniel G Watt

Kyle L Henderson

Rolf K Thompson

A directional access network can include a plurality of nodes and wireless links between ones of the nodes. Topology management of the network can discover when network fragmentation exists, identify nodes positioned to heal the fragmentation, and establish new active links between the identified nodes.

Directional access network control system and method

A method is disclosed for operating a synchronous Code Division Multiple Access (S-CDMA) radio frequency communication system having a host transceiver unit and a plurality of user transceiver units. The method includes an initial step of defining a super-frame to be comprised of N sequential frames of data. In the preferred embodiment N is equal to three. For a user transceiver unit that obtains access to the host transceiver unit a next step of the method receives frames of data transmitted by the host transceiver unit and initially aligns a receiver timing and a transmitter timing of the user transceiver unit to a super-frame boundary of the received frames. A next step transmits frames of data from the user transceiver unit to the host transceiver unit using the initial timing alignment. A further step of the method detects at the host transceiver unit a difference between the arrival of the transmitted frames of data and a super-frame boundary and then transmits a timing correction parameter, preferably expressed in symbols, from the host transceiver unit to the user transceiver unit in order to align the transmitted frames of data to the super-frame boundary.

S-CDMA fixed wireless loop system employing subscriber unit/radio base

Disclosed is a method for transmitting information in a CDMA communication system, the method including steps of (a) multiplexing data and control information into a data stream; (b) encoding the data stream to form a stream of encoded I/Q symbol pairs; (c) inserting synchronization information into the stream of encoded I/Q symbol pairs; and (d) spreading the encoded I/Q symbol pairs and the inserted synchronization information using a same pseudonoise (pn) spreading code prior to transmission as a frame. The preferred frame structure includes an unencoded synchronization field followed by a plurality of multi-byte data fields. Individual ones of the plurality of data fields are separated by a control message field. Individual ones of the control message fields contain a single byte of a multi-byte control message frame.

Waveform and frame structure for a fixed wireless loop synchronous CDMA

Growing community of inventors

South Jordan, UT, United States of America

Michael J Hurst