OFDM RECEIVER WITH CSI BASED LLR METRICS

摘要

In wireless communication systems for digital video broadcasting, a receiver apparatus comprises a Viterbi decoder. This Viterbi decoder requires logarithm of likelihood ratios as an input. For a fading channel, the fading strength can be taken into account for computing the logarithm of likelihood ratios. In a mobile environment, because of the movement of the receiver, the fading strength varies . The receiver apparatus (1) of the invention determines logarithm of likelihood ratios in dependence of an estimate for a power of disturbance that is individually determined for each subcarrier. Hence, the logarithm of likelihood ratios can be calculated accurately and with an improved performance .