APPARATUS AND METHOD FOR ACK CHANNEL ALLOCATION IN ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS SYSTEM

摘要

An apparatus and a method for ACK channel allocation in an OFDMA(Orthogonal Frequency Division Multiple Access) system are provided to reduce the size of a bitmap and the number of logic gates which increase in accordance with the increase of the number of ACK channels/subchannels/symbols. An apparatus for ACK channel allocation in an OFDMA system includes a map decoder(300), an uplink bitmap generation unit(304), a symbol processing unit(302), a parallel conversion unit(306), and a channel allocation unit(308). The map decoder decodes a received data frame, and checks ACK region information with respect to each channel. The uplink bitmap generation unit generates the bitmap information which includes the ACK region information checked in the map decoder. The symbol processing unit obtains ACK/NAK information by the CRC(Cyclic Redundancy Check) of the received data frame, and extracts ACK channel information including the ACK/NAK information. The parallel conversion unit extracts ACK offset, ACK/NACK information, and ACK Enable information from the ACK channel information extracted in the symbol process unit. The channel allocation unit obtains ACK position information by using the ACK region information included in a bitmap and the ACK offset received from the parallel conversion unit, and allocates ACK channels.