New Higher Order Rotation Spreading Matrix for BSOFDM

Previously a new matrix called the rotation spreading matrix was proposed for block spread OFDM which had advantages over other well known spreading matrices such as the Hadamard in frequency selective channels such the UWB channels. Then a new paper discussed a method to expand this Rotation spreading matrix into higher order allowing the system BSOFDM to achieve higher order matrices which still showed excellent orthogonal properties which can be used in these frequency selective channels. This work is continued on the rotation spreading matrix and this paper presents another method to expand the rotation spreading matrix based on complete complementary sets of sequences which the authors have shown to have excellent properties in higher order matrices. This paper discusses the new method and presents a comparison between the two mentioned methods.