CDMA signature sequences with low peak-to-average-power ratio via alternating projection
Joel A. Tropp, Inderjit S. Dhillon, Robert W. Heath, Thomas Strohmer · 2004
Several algorithms have been proposed to construct optimal signature sequences that maximize the sum capacity of the uplink in a direct-spread synchronous code division multiple access (CDMA) system. These algorithms produce signatures with real-valued or complex-valued entries that generally have a large peak-to-average power ratio (PAR). This paper presents an alternating projection algorithm that can design optimal signature sequences that satisfy PAR side constraints. This algorithm converges to a fixed point, and these fixed points are partially characterized.