Trellis-based detection process and system

摘要

A method for detecting signals affected by intersymbol interference provides for a path memory in the form of a trellis admitting survivor paths comprising a first and a second stage. The first stage includes a shift register exchange with a given number of states and a given length lambda. The first stage outputs a first state S^Ak_k-lambda on the survivor path for the best state A_k, and a second state S^Bk_k-lambda on the survivor path for another state B_k. The second stage is configured as a two-state shift register exchange having a respective memory length Lambda, including respective first and second registers. In the respective first and second registers the survivor paths are stored leading to a respective first sigma⁰_k and second sigma¹_k state, whereby the respective first register contains the backend of the best survivor path, while the respective second register contains the backend of an alternative survivor path.