Soft-Input Soft-Output Modules for the Construction and Distributed Iterative Decoding of Code Networks (1)

摘要

Soft-input soft-output building blocks (modules0 are presented to construct and iteratively decode in a distributed fashion code networks, a new concept that includes, and generalizes, various forms of concatenated coding schemes. Among the modules, a central role is played by the SISO module 9and the underlying algorithm): it consists of a four-port device per- forming a processing of the sequences of two input probability distributions by constraining them to the code trellis structure. The SISO and other soft-input soft-output modules are employed to construct and decode a variety of code network, include- Ing "turbo codes" and serially concatenated codes with interleavers.