A generalization of multidimensional modulation
Hikmet Sari · 2002
The paper presents a generalization of multidimensional modulation to all dimensions that are an integer power of 2. Minimum-bandwidth transfer functions are constructed using binary orthogonal Walsh-Hadamard sequences. The author also presents a time-domain approach which consists of using Walsh-Hadamard sequences as spreading and despreading sequences and discusses its relationship with conventional direct sequence code-division multiple access (DS/CDMA). It is pointed out that multidimensional modulation systems essentially have the same performance and bandwidth efficiency as conventional 2-D systems.