Title :
Multi-scale DS-CDMA for 4G wireless systems
Author :
Ozturk, Ertan ; Atkin, G.E.
Author_Institution :
Asia Pacific Telecom Carrier Solution Group, Motorola, Rolling Meadows, IL, USA
Abstract :
We design a multi-scale DS-CDMA as a new multi-rate system using orthogonal optimum wavelets for 4G wireless systems. Multi-scales of chip waveforms that generates a multi-chip rate scenario provide orthogonality between users on the different scales and allows to use the same frequency bandwidth. The probability of error, and power spectral density (PSD) equations of this multi-chip rate system for quasi-synchronous case are derived. Then, optimum wavelets are obtained. This design provides better interference cancellation and bandwidth efficiency, compared to conventional multi-rate systems
Keywords :
FIR filters; code division multiple access; error statistics; filtering theory; interference suppression; land mobile radio; multiuser channels; radiofrequency interference; spectral analysis; spread spectrum communication; wavelet transforms; 4G wireless systems; FIR filters; PSD equations; bandwidth constraint; bandwidth efficiency; chip waveforms; error probability; frequency bandwidth; interference cancellation; mobile radio systems; multi-chip rate; multi-chip rate system; multi-rate system; multi-scale DS-CDMA; multiaccess interference; optimum wavelets; orthogonal optimum wavelets; power spectral density; Asia; Bandwidth; Delay effects; Equations; Frequency; Interference cancellation; Multiaccess communication; Multiple access interference; Optimization methods; Wavelet domain;
Conference_Titel :
Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-7206-9
DOI :
10.1109/GLOCOM.2001.966307
