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This paper shows a fast simulation method of low-density parity-check (LDPC) codes by using importance sampling (IS). In IS, the design of the simulation probability density function (PDF) plays a very important role to reduce the simulation time. We derive the optimal simulation PDF, which can reduce the variance of the estimator to zero. Since the optimal simulation PDF includes true error probability,...
This study shows a new design method of a simulation probability density function (PDF) for a fast frame error rate (FER) evaluation of low-density parity-check (LDPC) codes. It is difficult to evaluate a very low FER of LDPC codes by Monte Carlo simulation methods since it has excellent performance under iterative decoding. Cole et al. proposed a three-step estimation method of the low FER of LDPC...
We research on a fast simulation method for turbo codes over an additive white Class A noise (AWAN) channel. The reduction of the estimation time is achieved by applying importance sampling (IS). The design of the simulation probability density function (PDF), which is another PDF used in IS, affects the accuracy of the estimator. Since the previous simulation PDF design based on the optimal simulation...
Relay channels are known as a model of multihop wireless networks which are often studied. In relay channels, the sender sends a message to the relay and the receiver, the relay encodes the channel output again and forwards it to the receiver, and the receiver decodes the message from the channel output. This paper deals with the universal coding problem for relay channels. First, we propose two new...
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