Transceiver and method for re-transmission and decording of high speed data in cdma mobile communication system

The present invention during high-speed data transmission that requires an adaptive modulation and coding scheme relates to a data transmission / reception apparatus and method for improving the reliability of the data transmitted according to a CDMA mobile communication system, the required modulation scheme, and to improve the performance of the system, the data transmission / reception apparatus and method that controls the data packet to be transmitted based on the number of available orthogonal codes is implemented. Data communication system, a mobile communication system, encoding, decoding, modulation, demodulation, HARQ, AMCS, HSDPA, the available orthogonal codes