Iterative Correction of Clipped and Filtered Spatially Multiplexed OFDM Signals

Peak-to-Average Power Ratio (PAPR) reduction in multicarrier systems with multiple transmit and receive antennas is considered. One attractive method for reducing the PAPR is to use clipping and filtering in the digital domain at the transmitter, which results in signal distortion prior to transmission. In this work, soft clipping correction at the receiver, recently proposed in literature, is extended to multi antenna systems. It is shown that taking the clipping noise into consideration leads to a significant performance improvement. The behaviour of the clipping correction algorithm is studied by error rates as well as EXIT charts. Moreover, the low complexity of the proposed scheme makes it attractive for various kinds of multi antenna detection algorithms.