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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 symbolbysymbol 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 decisionfeedback 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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 Spring '08
 Shea
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