Lecture Notes 8: Trellis Codes
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چکیده
In this lecture we discuss construction of signals via a trellis. That is, signals are constructed by labeling the branches of an infinite trellis with signals from a small set. Because the trellis is of infinite length this is conceptually different than the signals created in the previous chapter. We the codes generated are linear (the sum of any two sequences is also a valid sequence) then the codes are known as convolutional codes. We first discuss convolutional codes, then optimum decoding of convolutional codes, then discuss ways to evaluated the performance of convolutional codes. Finally we discuss the more general trellis codes for QAM and PSK types of modulation.
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