Spread Spectrum
digital communication, digital communication assignment, digital communication assignment no 4, digital communication assignments, digital communication all assignments
Q.1) The information bit duration in DS-BPSK spread spectrum communication system is 4 ms while the chipping rate is 1 MHz. Assuming an average error probability of 10–5 for proper defection of message signal, calculate the jamming
margin.
Interpret your result.
Q.2) Develop a
schematic for PN sequence to get maximum length of 255 states.
Q.3) State
and explain properties of PN sequence.
Q.4) A PN
sequence is generated using a feedback shift register of length m = 4 the chip
rate is 107 chips per second. Find the following parameter :
i)
PN sequence length
ii)
Chip duration of the PN sequence
iii)
PN sequence period.
Q.5) Develop
maximal-length codes for the feedback configuration [6,5,3,2] whose period is
63 and initial seed is 100000 and verify sequence as PN sequence.
Q.6) A PN sequence
using 19 shift register is generated by DS/BPSK system and average probability
of symbol error due to externally
generated interference signal does not exceed
10–5 . Calculate following
parameters in decibels
i) Processing Gain
ii) Jamming Margin (Src:
Communications System- 4th edition : Simon Haykin)
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