Title :
New effective joint detection technique for multicarrier CDMA wireless systems applying the Walsh codes
Author_Institution :
Inst. of Electron. & Technol., Poznan Univ. of Technol., Poland
Abstract :
The multicarrier CDMA technique applied in mobile radio communication systems is considered. The new fast algorithm for multi-user combining and multicarrier modulation, in a base station transmitter, is presented. It is shown, that the inverse of the proposed algorithm is a very efficient method of multicarrier demodulation and joint multi-user detection. Its applications in base and mobile station receivers is discussed. It is described, how equalization of the selective fading channel, and MAI rejection can effectively be implemented in the time-domain. It is shown, that the computational complexity of such a reception technique is very low. The detailed considerations and simulation results for the down-link transmission are presented. The similar reception method for the up-link case is also considered in detail
Keywords :
Fourier transforms; Hadamard transforms; code division multiple access; codes; computational complexity; demodulation; fading channels; interference suppression; inverse problems; land mobile radio; modulation; multiuser channels; radio links; radio transmitters; radiofrequency interference; signal detection; spread spectrum communication; MAI rejection; Walsh codes; base station receiver; base station transmitter; complex Hadamard inverse Fourier transform; computational complexity; down-link transmission; fast CH-IF algorithm; inverse algorithm; joint multi-user detection; mobile radio communication systems; mobile station receiver; multi-user combining; multiaccess interference; multicarrier CDMA wireless systems; multicarrier demodulation; multicarrier modulation; orthogonal spreading sequences; selective fading channel equalization; similar reception method; simulation results; time-domain implementation; up-link transmission; Base stations; Computational complexity; Computational modeling; Demodulation; Fading; Land mobile radio; Multiaccess communication; Multiuser detection; Radio transmitters; Time domain analysis;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2000. PIMRC 2000. The 11th IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-6463-5
DOI :
10.1109/PIMRC.2000.881400