Sensitivity of random phase error and frequency offset on uplink performance of MC-CDMA 


Vol. 27,  No. 12, pp. 1154-1163, Dec.  2002


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  Abstract

Performance degradation of MC-CDMA with frequency offsed and random phase error is analyzed for the uplink in frequency selective slowly Rayleigh fading channel. The frequency offset denotes the frequency difference between oscillator of transmitter and oscillator of receiver, and random phase error means the phase difference between received carrier and carrier estimated by PLL loop of receiver. In this research, the good approximation methods(LLN, CLT) are adopted to derive the optimum average BER of system by means of analytic approach, and linear approximation is also applied to estimate the statistic of random phase error. From the analysis results, it is concluded that firstly, the smaller frequency offset, the greater degradation effect due to random phase error. Secondly, if the average loop SNR of PLL system is much larger that Ｅ_b/Ｎ_o, the effect of random phase error can be neglected regardless of combining techniques(EGC, MRC) and approximation methods as well as frequency offset. Specially, it is shown that when an average loop SNR is 20dB larger than Ｅ_b/Ｎ_o ,the performance difference compared with case of perfect phase estimation is within 1dB. Thirdly, MRC method outperforms EGC method in uplink.

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  Cite this article

[IEEE Style]

D. Cho, N. Kim, Y. park, "Sensitivity of random phase error and frequency offset on uplink performance of MC-CDMA," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 12, pp. 1154-1163, 2002. DOI: .

[ACM Style]

Dong-Kyun Cho, Nam-Soo Kim, and Yoan-Ok park. 2002. Sensitivity of random phase error and frequency offset on uplink performance of MC-CDMA. The Journal of Korean Institute of Communications and Information Sciences, 27, 12, (2002), 1154-1163. DOI: .

[KICS Style]

Dong-Kyun Cho, Nam-Soo Kim, Yoan-Ok park, "Sensitivity of random phase error and frequency offset on uplink performance of MC-CDMA," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 12, pp. 1154-1163, 12. 2002.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880