An IS-95 implementation of a DS-CDMA cell is supporting 120 equal power mobiles

Question

An IS-95 implementation of a DS-CDMA cell is supporting 120 equal power mobiles at a voice channel rate of 9600 bps. At the base station, E_b/N_0 is measured as 10.1 dB. Analyzing the active channel usage in the area, it is found that a voice user is effectively only using the channel 25% of the time. Measurements have also been made regarding interference from other cells and has determined to be a factor of 0.8. To increase the coverage, the base station has been divided so that directional antennas are used. How many directional antennas are required? Using the answer in . We are considering using an identical system for personal messaging. Assume the same E_b/N_0 developed in , the data rate for this system requiring 19.2 Kbits/second, channel usage of 25% and all other parameters the same, how many channels may be supported?

Explanation / Answer

its some what help full

https://www.cdg.org/technology/cdma_technology/a_ross/CDMARevolution.asp

https://www.cdg.org/technology/cdma_technology/a_ross/CovCap.asp

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