If a possibility of error P. 103, determine the processing gain required for a CDMA system to have 20 simultaneous users. Direct sequence spread spectrum is to be used for ranging. The approximate distance to be measured is 10 km to a resolution of 1 m. Determine the required chip rate fe FH/BFSK spread spectrum is to be used. The bit rate is 20 kb/s. The available bandwidth is 8 MHz. (a) Calculate the bandwidth required to pass the FM signal. (b) To combat interference, a (31,15) RS code is used. There is interference over 20 percent of the frequency band. Perfect symbol interleaving can be assumed so that symbol errors in each RD codeword can be considered independent. 1 1. Calculate the maximum number of hopping frequencies used. 2. How many bits are there in each hop? 3. What is the hopping rate? Cultura