Abstract
We study the optimal chip rate of adaptive power and rate direct-sequence code division multiple access (DS/CDMA) communication systems in Nakagami fading channels. We find that the optimal chip rate that maximizes the spectral efficiency depends upon both the channel parameters, such as multipath intensity profile (MIP) and line-of-sight (LOS) component, and the adaptation scheme itself. With the rate adaptation, the optimal chip rate is less than 1/T m irrespective of the channel parameters, where T m is multipath delay spread. With the power adaptation, however, the optimal chip rate and the corresponding number of tabs in RAKE receiver are function of the MIP and the LOS component.
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References
Gilhousen, K.S., et al.: On the capacity of a cellular CDMA system. IEEE Trans. Veh. Technol. 40, 303–312 (1991)
Simpson, F., Holtzman, J.M.: Direct sequence CDMA power control, interleaving, and coding. IEEE J. Select. Areas Commun. 11, 1085–1095 (1993)
Kim, S.W.: Adaptive rate and power DS/CDMA communications in fading channels. IEEE Commun. Lett., 85–87 (April 1999)
Oh, S.J., Wasserman, K.M.: Dynamic spreading gain control in multiservice CDMA networks. IEEE J. Select. Areas Commun. 17, 918–927 (1999)
Kim, S.W., Lee, Y.H.: Combined rate and power adaptation in DS/CDMA communications over Nakagami fading channels. IEEE Trans. Commun., 162–168 (January 2000)
Noneaker, D.L., Pursley, M.B.: On the chip rate of CDMA systems with doubly selective fading and rake reception. IEEE J. Select. Areas Commun. 12, 853–861 (1994)
Gass, J.H., Noneaker, D.L., Pursley, M.B.: Spectral efficiency of a power-controlled CDMA mobile personal communication system. IEEE J. Select. Areas Commun. 14, 559–569 (1996)
Dohi, T., Okumura, Y., Adachi, F.: Effects of spreading chip rates on transmit power distribution in power-controlled DS-CDMA reverse link. Elec. Letters 6, 447–448 (1997)
Jakes Jr., W.C.: Microwave Mobile Communications. John Wiley and Sons (1974)
Nakagami, M.: The m-distribution−A general formula of intensity distribution of rapid fading. In: Statistical Methods in Radio Wave Propagation, pp. 3–36. Pergamon Press (1960)
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© 2012 Springer-Verlag Berlin Heidelberg
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Lee, Y.H. (2012). Optimization of System Chip Rate in Adaptive DS/CDMA Communications over Nakagami Fading Channels. In: Lee, G., Howard, D., Ślęzak, D., Hong, Y.S. (eds) Convergence and Hybrid Information Technology. ICHIT 2012. Communications in Computer and Information Science, vol 310. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-32692-9_5
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DOI: https://doi.org/10.1007/978-3-642-32692-9_5
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