Patent ID: 7002904

Claim:
An OFDM (Orthogonal Frequency Division Multiplexing) transmitting apparatus where serial input data is converted to parallel data blocks of length N, comprising: a rotational sub-block partitioner for partitioning the input data block of length N into M, the number of sub-block, and distributing the partitioned data of length L (N/M) into M sub-blocks one by one rotationally; M IFFTs (Inverse Fast Fourier Transformers) for performing L-point IFFT on the successive N/M data assigned to each M sub-block; M coefficient multipliers for multiplying the N/M data output from each IFFT by predetermined coefficients to give orthogonality to the frequency components of the N/M data; a phase factor optimizer for optimizing M phase factors to minimize a PAPR (Peak-to-Average Power Ratio) using the N/M output values of each coefficient multiplier; M multipliers for multiplying the optimized M phase factors by the corresponding outputs of the coefficient multipliers; and an adder for summing the outputs of the M multipliers on a symbol-to-symbol basis.