Abstract :
In the downlink of direct-sequence code-division multiple-access (DS-CDMA) cellular systems, system capacity is limited by multiuser interference. This interference can be suppressed at the receiver by interference whitening approaches such as chip equalization and generalized RAKE (G-RAKE) reception. In this paper, we show how these advanced receivers can increase system capacity. First, the G-RAKE receiver formulation is extended to include soft handoff and other-cell interference. Then, voice capacity is evaluated, including the effects of fast fading, interference correlation, power control, orthogonality properties of own-cell signals, and soft handoff. Numerical results for the wideband CDMA system show that when the channel is dispersive, advanced receivers improve capacity by 30-34%
Keywords :
cellular radio; code division multiple access; interference suppression; power control; radio links; radio receivers; radiofrequency interference; spread spectrum communication; telecommunication control; DS-CDMA; cellular systems; chip equalization; direct-sequence code-division multiple-access; downlink system capacity enhancement; generalized RAKE reception; interference correlation; interference suppression; interference whitening; multiuser interference; orthogonality properties; own-cell signals; power control; receivers; soft handoff; wideband CDMA system; Base stations; Downlink; Fading; Interference suppression; Multiaccess communication; Multipath channels; Multiple access interference; Power control; RAKE receivers; Wideband;
