Title :
An adaptive multicarrier DS/CDMA system for forward links
Author :
Kim, Yun Hee ; Song, Iickho ; Won, Dae Han ; Lee, Ju Mi ; Kim, Hong Gil
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea
fDate :
6/21/1905 12:00:00 AM
Abstract :
We propose a multicarrier CDMA system with an adaptive subchannel allocation method for forward links. In the proposed system, each user´s DS waveform is transmitted over the user´s favorite subchannel having the largest fading amplitude among the subchannels. We analyze the performance of the system when orthogonal and random signature sequences are used and compare the performance with that of the multicarrier DS/CDMA system using frequency diversity. The results show that the proposed system has a performance gain over the frequency diversity system. We also investigate how the performance is influenced when the user´s signal is not perfectly allocated into the best subchannel
Keywords :
adaptive systems; channel allocation; code division multiple access; diversity reception; land mobile radio; multiuser channels; radio links; random processes; sequences; spread spectrum communication; DS waveform; adaptive multicarrier DS/CDMA system; adaptive subchannel allocation method; fading amplitude; forward links; frequency diversity; frequency diversity system; maximal ratio combiner; orthogonal signature sequences; performance analysis; random signature sequences; Amplitude estimation; Base stations; Fading; Filters; Frequency diversity; Multiaccess communication; Narrowband; OFDM; Performance analysis; Signal processing algorithms;
Conference_Titel :
Military Communications Conference Proceedings, 1999. MILCOM 1999. IEEE
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-5538-5
DOI :
10.1109/MILCOM.1999.821372
