420 wong lok theory of digital communications 4 isi

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Unformatted text preview: bol detector, which decides one transmitted symbol at a time, to minimize the average symbol error probability. The development is rather involved and the optimal symbol-by-symbol detector is usually too complex to implement. Here, we opt for another possibility. Instead of deciding a transmitted symbol at a time, we can consider to decide the whole transmitted symbol sequence simultaneously from the received signal. In this way, we aim at minimizing the probability of choosing the wrong sequence of symbols instead of the average symbol error probability. With this sequence detection approach, we can employ the ML principle to achieve our goal. The resulting “optimal” receiver is referred to as the maximum likelihood sequence (MLS) receiver. 7 We assume the use of FIR filters for the MMSE, LS, and decision-feedback equalizers. In these cases, we are not strictly observing the whole received signal, but some long segments of it. 4.19 Wong & Lok: Theory of Digital Communications 4. ISI & Equalization Now, let us...
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