PART 13
4. (a) Explain the necessity of equalizing filter. (5)
(b)With necessary transfer function and block diagram explain zero forcing linear equalizer.

(4)

5. (a) Explain FFT based multicarrier system with the help ofblock diagram (6)

(0) A total of 30 equal power users are to share a common communication channel by *
CDMA.Each user transmits information at the rate of 1lO0kbits/s via DSS and
BPSK.Determine the minimum chip rate to obtain the performance Eb/Jo=10dB.

(3)

6. Explain an optimum receiver for the AWGN channel. (9)

PART C

7. A multipath fading channel has a multipath spread of Tm=lIsec and a Doppler spread 575 .0.01
Hz.The total channel bandwidth at bandpass available for signal transmission is w—5Hz. The
signal designer selects a pulse duration T—IOsec.

(a)Determ ine coherence bandwidth and coherence time.

(b)Is the channel frequency selective ? Explain. (12)

8. Explain the decorrelation receiver used for multi user detection. Draw the block diagram
representation. (12)

9. Explain different Random Access Methods. 02)