Method and equipment to compute measures of entry decision for a turbo decoder soft

摘要

Method and equipment to compute measures of entry decision for a turbo decoder soft. A method and equipment for compute measures (metrics) of entry decision in a turbo decoder includes soft circuits associated with the modulation phase shift of 8 levels (8PSK)The quadrature amplitude modulation (16QAM 16 levels).In both implementations the rate measures the probability - log (LLR) in the code symbols are estimated as products of various constant values and various combinations of the components in phase and inSquare of a soft decision demodulada.In the implementation associated with the modulation scheme 16QAM, an estimate of a carrier signal / interference ratio (C / I) is also used to estimate some of the measures LLR.The estimates of LLR measures can also be obtained in association with schemes of QAM modulation to the square and PSK M levels, including, for example, 64QAM, 256qam at 16PSK.