WLC08-2: A TD-SCDMA Link Model Based on Mutual Information

In this paper, we propose a link model for TD-SCDMA systems for use by a system-level simulator to estimate block error rates (BLER) without doing time-consuming physical-layer simulations. Our model averages the different qualities of the physical channels using the mutual information between the coded bits at the transmitter and the post-rate-dematching soft information at the receiver, resulting in higher accuracy compared to existing models that average e.g. the raw bit error rate (BER) and that do not take rate-matching into account. Our model also supports the large range of possible coding rates and code block sizes in a generic way, greatly reducing the amount of simulation data that have to be included in the model when many different services are used. Simulations show that the accuracy of our model stays within 0.2 dB for Turbo coding and 0.5 dB for convolutional coding, even in Rayleigh fading channels.