Perfonnance of the Selection Transmit Diversity Using the Adaptive Rate QAM and On/Off Power Control 


Vol. 27,  No. 11, pp. 1004-1010, Nov.  2002


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  Abstract

The previous study[1] showed that the spectral efficiency of the conventional selection transmit diversity system can be increased by replacing its fixed modulation scheme with the adaptive power and rate QAM scheme. However, since it adjusts the transmission power according to the instantaneous channel condition, the successful operation of [1] requires a transmission power amplifier of high linearity, which is not easy to implement. In this paper, as a solution to resolve this difficulty, we present a selection transmit diversity employing an adaptive rate QAM with on/off power control and compare its performance with that of [1]. Numerical results show that, in a Rayleigh fading environment, the spectral efficiency of the proposed scheme is less than that of [1] by about 1 bps/Hz, under the conditions that the possible QAM constellation size is restricted to be one of {O, 4, 16, 64}, the number of transmit antennas is equal to or less than 3, and the instantaneous BER at every channel condition has to be under 10^-3. Also they show that the spectral efficiencies of the two systems become almost the same, when the resolution of the constellation size is enhanced so that the constellation size can be any real number.

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  Cite this article

[IEEE Style]

C. H. Lim and J. Kim, "Perfonnance of the Selection Transmit Diversity Using the Adaptive Rate QAM and On/Off Power Control," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 11, pp. 1004-1010, 2002. DOI: .

[ACM Style]

Chang Heon Lim and Juno Kim. 2002. Perfonnance of the Selection Transmit Diversity Using the Adaptive Rate QAM and On/Off Power Control. The Journal of Korean Institute of Communications and Information Sciences, 27, 11, (2002), 1004-1010. DOI: .

[KICS Style]

Chang Heon Lim and Juno Kim, "Perfonnance of the Selection Transmit Diversity Using the Adaptive Rate QAM and On/Off Power Control," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 11, pp. 1004-1010, 11. 2002.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880