Power and Rate Adaptations in Multi-carrier DS/CDMA Communications over Rayleigh Fading Channel 


Vol. 30,  No. 6, pp. 423-433, Jun.  2005


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  Abstract

We present power(in frequency domain) and rate adaptation(in time domain) schemes in multicarrier (MC) direct-sequence code-division multiple-access(DS/CDMA) communications. Utilizing channel state information from the receiver, the adaptation schemes allocate power the user's sub-band with the largest channel gain. In the time domain, the transmission data rate is adapted for a desired transmission quality. In the case of single-user channels, a closed-form expression is derived for an optimal time domain power adaptation that minimizes the average bit error rate(BER). Channel inversion power adaptation is found to provide nearly optimal performance in this case, as the number of sub-bands or available average transmission power increase. Analysis and simulation results show the BER performance of the proposed power and rate adaptations with fixed average transmission power significantly improves the performance over the power allocation in the frequency domain only. Also, we compare the performance of the p posed power and rate adaptation schemes in MC-DS/CDMA systems with that of power and rate adapted single carrier DS/CDMA systems with RAKE receiver.

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  Cite this article

[IEEE Style]

H. Ahn and Y. H. Lee, "Power and Rate Adaptations in Multi-carrier DS/CDMA Communications over Rayleigh Fading Channel," The Journal of Korean Institute of Communications and Information Sciences, vol. 30, no. 6, pp. 423-433, 2005. DOI: .

[ACM Style]

Heejune Ahn and Ye Hoon Lee. 2005. Power and Rate Adaptations in Multi-carrier DS/CDMA Communications over Rayleigh Fading Channel. The Journal of Korean Institute of Communications and Information Sciences, 30, 6, (2005), 423-433. DOI: .

[KICS Style]

Heejune Ahn and Ye Hoon Lee, "Power and Rate Adaptations in Multi-carrier DS/CDMA Communications over Rayleigh Fading Channel," The Journal of Korean Institute of Communications and Information Sciences, vol. 30, no. 6, pp. 423-433, 6. 2005.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880