Simulation of Third Generation CDMA Systems - Virginia Tech

Finally the transmitted data is given by,st () = d() tc () t(3.23)sscwhere c SC is the complex uplink scrambling code as described in section 2.5.S(t)h(t,τ)r’(t)r(t)n(t)Figure 3.14: Transmission through Channel and Reception at the Rake Front EndEach transmitted signal is passed through a multipath channel as shown in Figure 3.14, wherer(t) is the received signalh(t,τ) is the complex channel responsen(t) is the complex Gaussian noise at the front end of the receiverNow,Nr’( t) = Êhi( t, τi) s( t -τi)i=1(3.24)Here we assume that we have N multipath component in the channel. Each of these h i (t,τ i ) iscomplex i.e. h() t = h(, t τ ) ei i ijφ(, t τ )The received signal is then given by,iir() t = r‡ () t + n()t(3.25)The following figure represents the signals at the i th finger of the rake receiver.44