Distortionless crest factor reduction for forward link CDMA

Forward link code division multiple access (CDMA) signals typically suffer from high crest factors. A signal with a large crest factor is not only vulnerable in the presence of nonlinear components such as power amplifiers, but also leads to low transmission power efficiency. In this paper, we propose two blind selected mapping techniques to reduce the crest factor of a forward link CDMA signal. Both techniques are built on the concept of selecting for transmission, the signal with the lowest crest factor from a set of equivalent representations. They are "blind" in the sense that no side information on the selection is transmitted. Simulation results demonstrate the effectiveness of our proposed crest factor reduction algorithms.