QPSK DIFFERENTIAL SPACE TIME CODING ON DIFFERENT UNITARY MATRICES SETS

摘要

A QPSK differential space time coding apparatus using a different unitary matrix set is provided to reduce interference between adjacent channels and to minimize fading of a transmitting signal by using two transmission antennas and one reception antenna. A unitary matrix selection unit(120) corresponds to a transmission channel with respect to a QPSK signal for transmission. A multiplier unit(140) performs a multiplying process for an output of the unitary matrix selection unit, an initial matrix, and a feedback signal. A delay unit(150) delays a signal. A transmission matrix unit(160) assigns an output of the multiplier unit to each of antennas. A transmission/reception apparatus performs a differential modulation process by selecting the unitary matrix corresponding to a dual channel type from a plurality of unitary matrix sets.