Orthogonal frequency-division multiplexing system, a method and apparatus for transmitting control information

To provide a orthogonal frequency-division multiplexing method and apparatus for transmitting control information in an OFDM system. The method comprises the steps of: after L1 - total number of bits of signaling information, determines the number of LDPC blocks, wherein the layer 1L1 - signaling information will be transmitted through LDPC block; when a plurality of LDPC blocks, each LDPC block is calculated the number of input information bits; the number of OFDM symbols based on determining a number of puncturing bits; and transmitting one or multiple LDPC blocks comprises a frame.