Recursive generation of constant amplitude multi-code DS-CDMA signal
Yong Cheol Kim · Electronics Letters · 2003
A constant amplitude multi-code CDMA scheme, which achieves an information rate of (3/4)K for any K, while Wada's method works only for 3/4 (K=1) and 9/16 (K=2), is presented. It has a recursive structure such that the input at the top-level encoder continues to be divided into three groups and lets the lower-level encoder handle the divided input. Finally, groups of three bits are separately encoded at the basic-level encoders and then are spread in combination by pseudo-orthogonal matrix into constant amplitude signal.