Patent ID: 8223866

Claim:
Apparatus for determining a peak to average power ratio, PAPR, and enabling communication of data in a multi-carrier modulation, MCM, system, comprising: a cache that stores a plurality of randomly generated scrambling sequences, said plurality of randomly generated scrambling sequences generated prior to PAPR determination; a multiplier that multiplies together a scrambling sequence of said plurality of randomly generated scrambling sequences and a data block to produce a product sequence; a transform operator that accepts said product sequence without further modification and generates a transformed-value block therefrom; a PAPR calculator that accepts said transformed-value block and calculates a PAPR value; and a comparator that compares said PAPR value to a predetermined threshold value and permits said transformed-value block to be prepared for transmission and subsequently transmitted without further PAPR calculation when said PAPR value is smaller than said predetermined threshold value.