New Higher Order Rotation Spreading Matrix for BSOFDM

Abstract

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. ABSTRACT 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. 1

A new approach to BSOFDM - parallel concatenated spreading matrices OFDM

“…3) Rotation Spreading Matrix: The Rotation spreading matrix for BSOFDM was proposed in [1] and a number of variations and studies carried out [6], [7], [8], [9] and its structure is as follows for U 2 = 2 × 2,…”

Analytical Study of the Rotation Spreading Matrix of Block Spread OFDM with MMSE Equalization

“…The angle α is chosen depending on the system requirements and a simulation studies [2], [3], [4] and [5] comparing different angles performance can be seen in Figure 1, comparing angles for α = pi 6 , π 3 , π 7 in UWB channel CM 1 using N = 64 subcarriers and ML decoding.…”