Patent ID: 8090039

Claim:
A wireless transmitter, comprising: an encoder to encode transmitting signals using a space-time code matrix and to output space-time code outputs, each of the space-time code outputs including space-time code signals; spreaders to respectively spread space-time code signals of each of the space-time code outputs by using a plurality of different spreading codes, the space-time code signals being different based on an encoding operation of the encoder, wherein the space-time code signals of each of the space-time code outputs are spread into a same spreading region in time and frequency domains in order that the spread space-time code signals are stacked on the same spreading region; multiplexers to respectively generate a multiplexed spread space-time code signal by multiplexing the spread space-time code signals of the same spreading region; and a transmitter to simultaneously transmit multiplexed spread space-time code signals output from the multiplexers through different antennas; wherein the space-time code signals include a first space-time code signal and a second space-time code signal, the first and second space-time code signals correspond to first and second time slots, respectively, and each of the spreaders spreads the first and second space-time code signals into the same spreading region using the spreading codes at the first and second time slots.