Peak-to-Average Ratio Reduction With Tone Reservation in Multi-User and MIMO OFDM
The authors extend Tone Reservation for peak-to-average ratio reduction in MIMO-multiuser OFDM scenarios. First, they consider a multi-user BC (BroadCast) situation where a precoding is applied at every carrier. This is considered to be a very demanding situation for peak-to-average ratio reduction. Tellado's Tone Reservation, however, is especially suited for this situation, as well. It reserves all spatial dimensions of the reserved carriers and has hence not to take into account possible implications resulting from precoding. Secondly, for a point-to-point (pt2pt) MIMO-OFDM scenario, they assume that the last eigenchannel is too weak to be used for transmission, thus, reserving it will offer redundancy for peak-to-average ratio reduction.