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17.5 cdma2000 1X EV-DO > 17.5 cdma2000 1X EV-DO - Pg. 619

17.5 cdma2000 1X EV-DO 619 The total received power, S, at the base station from a mobile is the sum of the pilot channel power (p p ), the DRC channel power (p d ), the traffic channel power (p t ), and the ACK channel power (p a ). To simplify the analysis, we neglect the contribution of the ACK channel, because only one mobile station at most transmits the ACK channel at a time. The ratio of the total received power, S, from the mobile to the received pilot power can be expressed as [3]: S S p p p p p d p t v f 10 G T /10 (17.21) (17.22) 1 10 G D /10 where: G D G T v f DRC channel gain in dB with respect to pilot traffic channel gain in dB with respect to pilot traffic channel activity factor The required ratio of the pilot chip energy to total noise plus interference power spectral density E c /N t will be: E c ( p p /B w ) d (17.23)