Consider CDMA based cellular systems. a) (4 marks) In a BPSK-CDMA system with a process gain of N= 2047, how many users may be supported while the error probability is less than 0.001. Assume E, / N = 10 dB. b) (2 marks) Answer with no more than 3 lines for each i) Explain how the CDMA cellular system can work with a frequency re-use factor of (N=1) (i.e. the same carrier frequency is used in all cells)? ii) Explain why a CDMA system cannot work without a good power control. c) (2 marks) Fast (closed loop) power control in WCDMA system uses 1.5 KHz sampling rate. How is this value suitable for a mobile moving at 100 Km/hr.( Assume a carrier frequency of 1800 MHz). d) (2 marks) A WCDMA system has a chip rate of 3.84 MChip/second. Can the RAKE receiver resolve two paths differing in their travelled distance by 150 meters.