Consider a BPSK/CDMA system with a bit rate of 100 kbps and
a maximum length shift register of length m = 10 stages.
a. What is the chip rate, the processing gain and the
-to- bandwidth of this spread-spectrum signal?
b. Assuming that Eb/N0 = 6.8 dB, determine the bit error
probability and the number of users that can be supported by this system if the
spreading codes are perfectly orthogonal to each other.
c. For the same bit error probability performance for BPSK
modulation as in part (b), determine the number of users that can be supported
by this system in the presence of
Consider a BPSK/CDMA system with a bit rate of 100 kbps and
a maximum length shift register of length m = 10 stages.
a. What is the chip rate, the processing gain and the
-to- bandwidth of this spread-spectrum signal?
b. Assuming that Eb/N0 = 6.8 dB, determine the bit error
probability and the number of users that can be supported by this system if the
spreading codes are perfectly orthogonal to each other.
c. For the same bit error probability performance for BPSK
modulation as in part (b), determine the number of users that can be supported
by this system in the presence of synchronous users with long spreading
sequences so that multi-user interference dominates the AWGN.
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