N.V. Adnani, R.J.C. Bultitude, and R.H.M. Hafez (Canada)
Rake, W-CDMA, Interference.
A service speciﬁcation of third generation wireless systems
using wideband CDMA is to enable the delivery of data
rates up to 2 Mbps to a single user on the downlink chan
nel. One implication of such high data rates is the reduction of spreading gain, which results in increased multiple
access interference and also self-interference (SI). The lat
ter is the result of multipath propagation and the imperfect autocorrelation properties of spreading sequences that
must be used for despreading. In this paper, SI is estimated
using a semi-analytical approach when the number of distinct multipath groups, each the vector sum of all multipath
signals received within the delay resolution of the receiver,
and their strengths are known. This in turn is used to predict
bit error rates as a function of signal-to-noise ratio when a
Rake receiver is used in a mobile terminal.