Mathematical Colloquium 
Autocorrelation, difference sets and 

By  Ken W. Smith 2008 Mathematics Department Alumni Award 
From  Department of Mathematics and Statistics Sam Houston State University Houston, Texas 
When  November 7, 2008 4:00 pm 
Where  Weber 223 
Abstract  A variety of digital technologies (radar, wireless communication, etc.) require the construction of signals with special autocorrelation properties. Of special interest are sequences X with periodic autocorrelation d^{2} (so that XX* = d^{2}; the sum of the entries of X is d.) Since the autocorrelation is periodic, we may view X as an element of the group ring Z[G], where G is cyclic, and use the rational idempotents of G to construct X. 
Further Information 
Robert Liebler 
There will be Refreshments in Weber 117 at 3.30pm
The Colloquium counts as Seminar Credit for Mathematics Students.