Adaptive data transmission based on band-selection for MC-CDMA systems

Author

Kim, Jong-hyune ; Georghiades, Costas N. ; Huang, Garng M.

Author_Institution

Inf. & Telecommun., Samsung Electron., SeongNam, South Korea

Volume

5

fYear

2001

fDate

2001

Firstpage

3125

Abstract

We introduce an adaptive band-selection (ABS) scheme for Multi Carrier-Code Division Multiple Access (MC-CDMA) systems to improve system capacity. Instead of using all subcarriers, mobile stations transmit message data only through the selected frequency bands based on band-selection coefficients from the base station. By using the adaptive band-selection scheme, ABS MC-CDMA systems accommodate more users than MC-CDMA systems that use all frequency bands for message data transmission. Due to the time-varying wireless channel conditions and dynamic power allocations, band-selection coefficients should be adaptively determined at the base station every update period. In our ABS MC-CDMA systems, the processing gain, the transmitted power and the data rate depend on the number of selected bands. Under the assumption that the total transmission power and the total amount of transmission data are the same for both MC-CDMA systems and ABS MC-CDMA systems, SNR behaviors are investigated and BER performances are presented in terms of the number of users and the normalized Doppler frequencies

Keywords

adaptive control; bandwidth allocation; channel allocation; channel capacity; code division multiple access; data communication; mobile radio; power control; telecommunication control; time-varying channels; BER; MC-CDMA; SNR; adaptive band selection; adaptive selection; dynamic power allocation; message data transmission; mobile stations; multi carrier-code division multiple access; normalized Doppler frequencies; performance; system capacity; time-varying wireless channel; user number; Adaptive systems; Bandwidth; Base stations; Bit error rate; Channel allocation; Data communication; Frequency; Mobile communication; Multiaccess communication; Multicarrier code division multiple access;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE

Conference_Location

San Antonio, TX

Print_ISBN

0-7803-7206-9

Type

conf

DOI

10.1109/GLOCOM.2001.966002

Filename

966002