Patent ID: 7418041

Claim:
A transmitting apparatus for reducing the peak-to-average power ratio (PAPR) of a signal transmitted on N(=2 r ) sub-carriers in the transmitting apparatus including encoders for block coding w input data, where r is a natural number more than 2, and outputting N code symbols in an orthogonal frequency division multiplexing (OFDM) communication system, the transmitting apparatus comprising: a serial to parallel (S/P) converter for converting a data stream in to w−(r−2) parallel data streams, where w is the length of an information word; a first encoder for receiving w/2 parallel data streams of the w−(r−2) parallel data streams from the serial to parallel converter, block coding the w/2 parallel data streams, and outputting N/2 first code symbols; an input operator generator for generating (r−2) input operator data streams according to the w−(r−2) parallel data streams; and a second encoder for receiving the parallel data streams from the serial to parallel converter not input into the first encoder and the (r−2) input operator data streams, block coding the received data streams, and outputting N/2 second code symbols, wherein the (r−2) input operator data streams make N code symbols complementary.