Title :
A generalization of multidimensional modulation
Author_Institution :
Soc. Anonyme de Telecommun., Paris, France
Abstract :
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
Keywords :
Hadamard matrices; binary sequences; code division multiple access; quadrature amplitude modulation; sequences; time-domain analysis; transfer function matrices; 2-D systems; DS/CDMA; bandwidth efficiency; binary orthogonal Walsh-Hadamard sequences; despreading sequences; direct sequence code-division multiple access; generalization; minimum-bandwidth transfer functions; multidimensional modulation; performance; spreading sequences; time-domain approach; Additive white noise; Bandwidth; Bit rate; Constellation diagram; Costs; Filters; Multidimensional systems; Phase modulation; Quadrature phase shift keying; Transfer functions;
Conference_Titel :
Communications, 1995. ICC '95 Seattle, 'Gateway to Globalization', 1995 IEEE International Conference on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2486-2
DOI :
10.1109/ICC.1995.524191
