Consider CDMA based cellular systems. a) (4 marks) In a BPSK-CDMA system with a process gain...
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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. 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.
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Related Book For
Income Tax Fundamentals 2013
ISBN: 9781285586618
31st Edition
Authors: Gerald E. Whittenburg, Martha Altus Buller, Steven L Gill
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