EXTENDED CONVOLUTIONAL CODES

摘要

: A system and method for providing increased forward error correction by providing extended convolutional coding for packets/frames or superframes used in wireless transmission. A wireless system having an extended convolutional encoder/decoder therein, includes a wireless network, a server having an extended convolutional encoding/decoding module, one or more clients, at least one of which is being adapted for extended convolutional encoding/decoding; and a wireless transmission unit for the server and one or more clients to communicate via the wireless network. A method for providing the extended con volutional encoding includes the steps of (a) retrieving a set of codes from a database that has a maximal -minimal free distance within a certain range; (b) selecting a subset of codes from the set in step (a) that have the smallest number of paths at the maximal -minimal free distance; and (c) finding extended convolutional codes by selecting a code having a certain rate from the subset of codes that have the smallest number of paths at increased free distances to provide the best candidates. The performance of the extended code can be verified prior to encoding and using the extended convolutional code rate.