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

Volume

2

fYear

1999

fDate

6/21/1905 12:00:00 AM

Firstpage

1095

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Military Communications Conference Proceedings, 1999. MILCOM 1999. IEEE

Conference_Location

Atlantic City, NJ

Print_ISBN

0-7803-5538-5

Type

conf

DOI

10.1109/MILCOM.1999.821372

Filename

821372