Interference suppression and CDMA overlay
7.1 NARROWBAND INTERFERENCE SUPPRESSION
To get an initial insight into the problem, we assume that the received signal after frequency down conversion has the form x(i) = b · c(i) + J (i) + n(i) (7.1)
where at sampling instant iTc , b is data, c(i) is the code, J (i) is the narrowband interference, Tc is the chip interval and n(i) is the Gaussian noise. The receiver structure is shown in Figure 7.1. For the two types of ﬁlters, from Figures 7.2 and 7.3 we deﬁne vectors of input samples and ﬁlter taps as follows: Xi1 =...