Question

A BPSK spread spectrum system, using coherent detection, is used to transmit data at 250 bps and system has to work in a high dense interference with minimum performance of one error in 20000 bits. Determine the minimum chipping rate if the interference signal is 300 times stronger than the received signal. Assume Q(3.9)-0.00005 error (16M)

Answer 1

is given by, he PobabP)fry of BPSK of (J Pce) Lerfo Eb 2 No Eb Tr NO J TC Since Jamming signal is 300 imes STHongey than Jeceived Signal, T /2so Ps Equation Those Putting hese values in Ep X 75, 300 Tc O00 hat uWe KnoLO Pe X Eb N Ero9 în^o,000 birs Evror One Mepresents Puobabiliry of Pe 0.ooooS R0,00 o

0.000 05 No 0.0000 5 Hence, Q (3.9) Eb 5.| Ep 3.9 No No

Putting value of E NO 15.2 000 Tc 1 Tc 5703 5 chipping sate (minimum) 57035 bps Tc