L3harris Technologies, Inc.

Xilinx, Inc.

Edwin J Hemphill

Raied N Mazahreh

James M Simkins

Ryan W Hinton

Joshua D Gunn

Radivoje Zarubica

David G Landon

Brent A Kenney

Philip M Hirz

David S Nelson

Jason Wilden

Patrick L Newbold

Stephen A Laraway

A radio frequency (RF) rake receiver may include a plurality of diversity receive paths, with each diversity receive path including a respective rake receiver despreader, and a tracking loop. The tracking loop may be configured to generate a composite timing signal based upon the rake receiver despreaders, and provide the composite timing signal to the diversity receive paths.

Rake receiver and related methods

A method for mitigating interference in a frequency hopping channel system based on codeword metrics obtained during decoding of codewords. The method includes decoding a plurality of codewords using a particular error control coding method. Each of the plurality of codewords includes portions received from plurality of channels in the frequency hopping channel system. For each decoded codeword, one or more codeword metrics are obtained based on the cost of correcting errors during decoding of the plurality of codewords. Based on the codeword metrics, one or more channel metrics are inferred. Based on the inferred one or more channel metrics, a reliability metric of a particular channel is reduced, or incoming symbols received from the particular channel are ignored during decoding.

Frequency hopping interference detection using decoder codeword metrics

A forward error correction (FEC) decoder is configured to find an alignment of a code block in a data stream by attempting to fully or partially decode one or more data windows of a predetermined size in the data stream. The predetermined size is a size of each codeword. The FEC decoder selects a first data window of the predetermined size, attempts to decode the first data window based on a particular error control coding method, and determines whether a valid codeword can be identified by attempting to decode the first data window. In response to determining that a valid codeword can be identified, the FEC decoder determines that an alignment of the codeword with the first data window is found. Otherwise, the FEC decoder selects a second data window of the predetermined size and attempts to decode the second data window.

Alignment detection by full and partial FEC decoding

Transmitting data in a mesh network. A method includes identifying points on a piecewise continuous surface. The piecewise continuous surface defines minimum threshold power values to maintain a predetermined signal-to-noise ratio at a predetermined bitrate for a transmitter node transmitting to one or more receiver nodes in the mesh network. Points of a constant total power surface are identified defining required ratios of transmitting power for transmitting sources of the transmitter node. One or more points on the piecewise continuous surface that intersect with the constant total power surface are identified. As a result, transmitting power levels for the transmitting sources of the transmitter node are identified. As a result, data is transmitted at or above transmitting power levels, using the transmitting sources.

Power and rate control algorithm for multi-antenna communication links in a mesh network

A method and apparatus for performing a recursion process on a data block for error correction. The disclosure describes concurrently operating pipelined sub-processes that decode the data block with error correction. The pipelined sub-processes are implemented as sub-circuits of an integrated circuit. The output data from each sub-process is stored for input by a subsequent sub-process of the pipelined sub-processes.

Pipelined architecture implementing recursion processes for forward error correction

Method and apparatus are described for determining when a convolution decoder is out of synchronization. Normalizations from a convolutional decoder are counted to provide a normalization count, and errors from the convolutional decoder are counted to provide an error count. One of the normalization count and the error count is compared to a first threshold associated with the selected one of the normalization count and the error count. The other of the normalization count and the error count is compared to a second threshold in response to meeting the first threshold, such as bit errors per X normalizations or normalizations per Y bit errors. From this latter comparison, an indicator is generated as to whether the convolutional decoder is synchronized or not.

Method and apparatus for Viterbi synchronization

Method and apparatus for concatenated and interleaved turbo product code (TPC) encoding and decoding are described. Described are series concatenated and interleaved TPC encoders and decoders. One or more combinations of these encoders and decoders may be combined to provide a coder/decoder (CODEC). Such a CODEC may be used for communicating information between a computer and a network via a data channel.

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Kaysville, UT, United States of America

Edwin J Hemphill