Abstract
In many practical communication systems such as digital microwave radio, the main cause of transmission errors is usually due to the presence of intersymbol interference, rather than the noise. For such systems the sequence estimator significantly outperforms the symbol-by-symbol detector, even when a certain form of equalization techniques is used. The key obstacle to the applicability of sequence estimator is its large complexity. Denote the channel memory length by /spl nu/ and alphabet size by m. Using a Viterbi-like implementation, the estimator with truncation depth /spl delta/ requires O(m/sup /spl nu/+1/) arithmetic operations per symbol, and O(/spl delta/m/sup /spl nu//) storage elements. In most practical situations, /spl delta/ is chosen such that /spl delta/=O(/spl nu/). We propose the lattice sequence estimator (LSE), which only requires O(/spl delta/)/sup 2/ arithmetic operations per symbol, and O(/spl delta/) storage elements. For simplicity, the multilevel PAM system is considered. >
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