Lec 14 MIT 6.451 Principles of Digital Communication II
PROFESSOR: --we'll start off with a little review, so you might chance it. We're in the middle of the chapter nine on convolutional codes. Today, I intend to hand out problem set six. I believe Ashish will have it when he gets here. And we'll hand it out at the end. Last time, I introduced you to a lot of things about convolutional codes and their encoders. I stressed that a convolutional encoder had two distinct characters. One is it's a linear time-invariant system. So we can use the linearity and time-invariance and algebraic analysis of convolutional codes. Secondly, I stressed that's it's a finite state system, because it's a finite memory system where each memory element has a finite number of possible values, over F2 or indeed over any finite field. And therefore, we can use that for different kinds of analysis. We use that, for instance, in conjunction with linear property to find the minimum distance to a particular code. And we'll...