amplifier backoff
This is not a technique. i think this is a requirement. In some advance communications like 802.11, because of the modulation type that create some peak to average ratio bigger than one. To make sure we can deliever the linear output power, we need back off to account for the possible peak happens during data transmission. For example, 802.11g, the typical backoff number is about 6-8dB. In this case, if you want to deliever 18dBm output power to the load, you have to actually design a PA as if it can support 26dBm output power, assuming 8dB backoff.