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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,...
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...
To accommodate information streams with different data rates over a direct-sequence code-division multiple-access (DS-CDMA) network is required due to a large variety of information sources, such as voice, data, and images. This paper provides a novel adaptive blind estimating method for dual-rate DS-CDMA signals. The underlying idea is to estimate the channel and spatial signature by transforming...
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