Abstract
AbstractWe 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.Keywordsoptimal chip ratepower and rateDS/CDMAfading
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