Patent ID: 7324581

Claim:
An apparatus for mapping and spreading data symbols in a mobile communication system when quadrature phase shift keying modulation is performed in a mobile communication time division duplex mode, the apparatus mapping and spreading the data symbols by using binary operations, said apparatus comprising: a binary channelized data symbol generator for generating imaginary coefficients of binary information mapped symbols; a binary counter for counting the imaginary coefficients; a first XOR circuit for calculating XOR values for the most significant bit and the least significant bit of the binary counter, and outputting the resulting values; a binary scrambling code generator for mapping a scrambling code to 0 and 1, and outputting the mapped values; a second XOR circuit for calculating XOR values for the output value from the binary scrambling code generator, the output value from the first XOR circuit, and a real coefficient of the symbol mapped by the binary channelized data symbol generator; a mapper for mapping the values calculated by the second XOR circuit to binary numbers, and outputting the mapped values; and a switch for outputting the output values from the mapper to a real part and an imaginary part according to the least significant bit of the binary counter, wherein the values calculated by the second XOR circuit are binary numbers such as 0 and 1 divided into a real part and an imaginary part.