Patent ID: 7826558

Claim:
A transmission system comprising: a serial-to-parallel converting section that serial-to-parallel converts an inputted code stream and outputs a first code stream and a second code stream; a first spreading section that spreads the first code stream and the second code stream using a specific spread code, and outputs first and second spread sequences of a first path; a space-time transmit diversity coding section that performs space-time transmit diversity coding on the first code stream and the second code stream, and outputs the coded first code stream and second code stream; a second spreading section that spreads the first code stream and second code stream coded by using the specific spread code, and outputs first and second sequences of a second path; an orthogonal transforming section that converts odd-number-th chips of the first and second spread sequences of the second path to negative values, exchanges the order of the odd-number-th and even-number-th chips and outputs the orthogonally transformed first and second spread sequences; and a combining section that adds the first and second spread sequences of the first path to the orthogonally transformed first and second spread sequences, respectively, and transmits the addition results through antennas.