Iterative decoder

An iterative decoder for decoding a code block, comprising:na computation unit configured to perform forward and backward recursions over a code block or a code sub-block in each decoding iteration, wherein a first forward/backward decoding scheme is used in a first iteration and a second forward/backward decoding scheme is used in a second iteration,wherein the first and second decoding schemes are different in view of forward and backward processing and the second iteration is later than the first iteration.

An iterative decoder for decoding a code block, comprising:na computation unit configured to perform forward and backward recursions over the code block or a code sub-block in each decoding iteration, wherein a scheduling of forward and backward recursions is varied from one iteration to a later iteration, wherein forward and backward recursions are interchanged from the one iteration to the later iteration, anda memory in which state metric values calculated in said one iteration and used for initializing a forward or backward recursion in said later iteration are stored.

A method of decoding a code block by iteration, comprising:nperforming forward and backward recursions over the code block or a code sub-block in each decoding iteration using a computation unit, comprising:nusing a first forward/backward decoding scheme in a first iteration; andusing a second forward/backward decoding scheme in a second iteration,wherein the first and second decoding schemes are different in view of forward and backward processing and the second iteration is later than the first iteration.

A method of decoding a code block by iteration, comprising:nperforming forward and backward recursions over the code block or a code sub-block in a first decoding iteration according to a first forward/backward decoding scheme using a computation unit;calculating state metric values in the first iteration using the computation unit;storing the state metric values in a memory using the computation unit;reading the stored state metric values using the computation unit;initializing a forward or backward recursion in the second iteration by using the state metric values read from the memory using the computation unit;performing forward and backward recursions over the code block or a code sub-block in the second decoding iteration according to a second forward/backward decoding scheme which is different in schedule to the first decoding scheme using the computation unit;performing the forward and backward recursions over the code block or code sub-block according to a first decoding scheme in the first iteration;deriving a second decoding scheme from the first decoding scheme by interchanging backward and forward recursions; andperforming the forward and backward recursions over the code block according to the second decoding scheme in the second iteration.