The cross-partitioning scheme for an OFDM signal in multiple transmit antenna systems

The reduction of the potentially large peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal in multiple transmit antenna systems is considered in this paper. Multi-carrier signaling can support high-rate data transmission in a wireless channel environment. A large number of subchannels in a multi-carrier signal cause a large PAPR, which requires linearity of the transmission. Thus, highly linear power amplifiers can be caused to handle the large PAPR of the transmitted signals at the cost of power efficiency. Recently, partial transmit sequence (PTS) method has been proposed. In PTS, the transmitted signal is partitioned into subblocks and combined together with phase rotations to lower PAPR. This technique provides good performance with low complexity and some required side information. Using the concept of partitioning and phase rotation as in PTS, a combining method of an OFDM signal is proposed for multiple transmit antenna systems. Side information needs to be sent to the receiver together with data transmission to reconfigure the combined data blocks in multiple transmit antennas. Simulation results show that performance improvement can be achieved with the proposed scheme.