B.S.T.J. Briefs: A Note on a Type of Optimization Problem that Arisesin Communication Theory

improvements in the system; and A. R. Lingenfelter, who was responsible for recording and reducing the data. REFERENCES 1. Reiger, S. H., Codes for the Correction of "Clustered" Errors, I R E Trans., IT6, 1950, pp. 16-21. 2. Peterson, W. W., Error-Correcting Codes, M I T Press, 1961, p. 189. A Note on a T y p e of Optimization Problem t h a t Arises in Communication Theory By I. W. SANDBERG (Manuscript received March 16, 1966) A problem that has arisen1 in connection with the use of transversal filters to reduce the effect of intersymbol interference in digital communication systems is to determine a real N-vector c = (ci, c 2 , · · · , cN) such that, with n0 £ 5 = {1,2, · · · , AT}, 71=--« JfSF n^n o E ^ - CjXn--j (1)