The method and apparatus for transmitting/receiving signal in a communication system

The invention in the transmitting and receiving apparatus and method using block coding to reduce the OFDM (Orthogonal Frequency Division Multiplexing) type of communication system, a high peak power to average power ratio (Peak-to-Average Power Ratio) resulting from multiple sub-carriers in It relates. The invention of the w- (r-2) input data to parallel conversion to w- (r-2) of tissue to generate a parallel data / P converter and the w- (r-2) parallel data for this purpose w / 2 of the first encoder, enter the parallel data to the coding blocks to generate N / 2 symbols, the w- (r-2) of using the parallel data to generate the r-2 input data indicator after entering the indicator generating section, and the w- (r-2) parallel data of the w / 2 parallel data of the rest other than the parallel data and the r-2 input data block coded indicator N / 2 symbols a second encoder for generating, and wherein the communication system includes N (N = 2 And, wherein the N is characterized by an integer less than 2n (n≥1). OFDM, PAPR, IFFT, FFT, sub-carriers, the block coding, a code rate (code rate), the spectral efficiency