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However, since the peak-to-average ratio of CDMA signals is so high, the average power is relatively low, consequently resulting in a low PA efficiency (output power divided by input power). By decreasing the peak-to-average ratio, the average power of the peak-reduced signal at the output of the GC1115 can be increased, decreasing PA back-off thus also increasing PA efficiency. Fi illustrates that the decrease in PAR can then be used to increase the average signal power while still keeping the peaks below the PA's l dB compression point. The GC1115 can typically limit the output PAR of CDMA signals to between 6 dB and 7 dB while still meeting all relevant 3GPP or 3GPP2 requirements. This decreased PAR enables a 2 dB t0 3 dB increase in PA drive, which in turn allows PA manufacturers to achieve 2 dB t0 3 dB more PA output power. As PAs represent a significant percentage of the capital equipment cost of base stations, using a 10 W PA instead of a 20 W PA (for example) significantly decreases base station costs.
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