Patent ID: 7315580

Claim:
A method for high-order peak-to-average power ration (PAPR) reduction for an OFDM signal, comprising: (a) transforming a frequency domain signal X[k] of length N by an N-IFFT into a time domain signal x[n] of length N, where N is the number of useful data in an OFDM symbol, n=0, 1, . . . , N−1; (b) partitioning said sequence x[n] of length N into M disjoint subblocks, M being a power of 2 and greater or equal to 8, and N/M being an integer greater than 1; (c) transforming said subblocks into sub-sequences z 1 [n], each having the length N/M, l=1, 2, . . . , M and n=0, 1, . . . , (N/M)−1; and (d) each said sub-sequence z 1 [n] being processed using complex multiplication followed by phase rotation or directly using phase rotation, then addition to form a complete N-point transmitted signal {tilde over (x)}[n].