SISO DECODER WITH SUB-BLOCK PROCESSING AND SUB-BLOCK BASED STOPPING CRITERION

摘要

The present invention relates to SISO decoder for iteratively decoding a block of received information symbols (r), in particular for use in a turbo decoder, said block being divided into a number of windows of information symbols. In order to achieve a significant reduction of power consumption a SISO decoder is proposed comprising:at least one SISO decoding unit (17, 21) for SISO decoding of the received information symbols (r) of a window,a window activity flag storage (23) for storing window activity flags indicating if a window is made active or inactive,a window activity flag setting unit (17) for setting said window activity flag active or inactive, wherein said window activity flags are initially set active and wherein a window activity flag of a window is set inactive if a certitude indication value of the information symbols in said window are above a predetermined certitude threshold,a window activity flag reading unit (17, 22) for reading said window activity flags from said window activity flag storage (23), anda control unit (27) for controlling said at least one SISO decoding unit (17) based on the read window activity flags such that the information symbols of a window for which the corresponding window activity flag is set inactive are not SISO decoded in subsequent iterations.