Posted by: atri | September 12, 2007

Lecture 7: Hadamard codes

In today’s lecture we defined the notions of code families and dual of a linear code. We then looked at the dual of Hamming code, the Simplex code (and the closely related Hadamard code). We saw that Hadamard/Simplex codes have great distance (later we will see that it is the best possible) but lousy rate (while Hamming codes have great rates but lousy distance).

Till now, we have focussed on the worst case noise model. In the next lecture, we will look into Shannon’s work on stochastic noise models.


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