Title :
Nonlinear Overlapped Code Division Multiplexing System with High Spectral Efficiency
Author :
Zhou, Suhua ; Fang, Li ; Li, Daoben
Author_Institution :
Sch. of Inf. & Telecommun. Eng., Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
Improved overlapped code division multiplexing system with high spectral efficiency, called nonlinear OVCDM system, is proposed. Different from linear OVCDM system, the input alphabet of this system belongs to {0,1} and elements in the codeword matrix are real numbers. A nonlinear function and time varying codeword matrix is used to replace linear operation and the time invariant codeword matrix. A method to construct the nonlinear function and time varying codeword matrix is proposed. The simulation results of three NOVCDM systems are all better than linear OVCDM system with same spectral efficiency, additionally, bit error ratio of former two systems is better than low performance limit of ordinary OVCDM system.
Keywords :
code division multiplexing; matrix algebra; nonlinear functions; linear OVCDM system; nonlinear OVCDM system; nonlinear function; nonlinear overlapped code division multiplexing system; spectral efficiency; time invariant codeword matrix; time varying codeword matrix; Binary phase shift keying; Cities and towns; Code division multiplexing; Convolution; Convolutional codes; Delay effects; Diversity methods; Euclidean distance; Time varying systems; Wireless communication;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing, 2009. WiCom '09. 5th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-3692-7
Electronic_ISBN :
978-1-4244-3693-4
DOI :
10.1109/WICOM.2009.5302244
