Correction to "Achieving the Welch Bound With Difference Sets"

P. Xia was with the the Department of Electrical and Computer Engineering, University of Minnesota, and is now with Samsung Information System America, 75 West Plumeria Drive, San Jose, CA 95134 (email: [email protected]). S. Zhou is with the Department of Electrical and Computer Engineering, University of Connecticut, 371 Fairfield Road U-2157, Storrs, Connecticut 06269, USA (email: [email protected]). G. B. Giannakis is with the Department of Electrical and Computer Engineering, University of Minnesota, 200 Union Street SE, Minneapolis, Minnesota 55455, USA (email: [email protected]).