## A.3. CDMA-Based Cellular SystemsIn CDMA, the uplink is generally the limiting link in terms of capacity [2]. Consider N mobiles communicating to a single isolated base station. Assuming perfect power control, the signal from each mobile is received at the base station at its target power, S. Therefore, the interference from N 1 interfering mobile stations is Equation A-21 Now the interference due to the UWB transmitters can be introduced to modify I Equation A-22 The signal-to-interference ratio, SIR, for a particular user's signal arriving at the base station is Equation A-23 The total interference power can be expressed as Equation A-24 where J Equation A-25 Therefore, we can calculate E Equation A-26 where G is the processing gain, which is Equation A-26 is based on the analysis of a single isolated cell. Due to the limited time scales associated with this study, factors such as imperfect power control, voice activity, and inter-cell interference have not been considered in this analysis. Equation A-26 can be rearranged to calculate the target received power, S, which we now denote as S Equation A-27 A similar expression can be written for the target received power, S Equation A-28 The received powers, S can be calculated, and the UWB interference that makes S Equation A-29 Equations A-19 and A-29 can be combined to derive the UWB PSD, G Equation A-30 |

Ultra-Wideband Communications: Fundamentals and Applications

ISBN: 0131463268

EAN: 2147483647

EAN: 2147483647

Year: 2005

Pages: 93

Pages: 93

Authors: Faranak Nekoogar

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