Importance

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Abstract

A method of controlling peak-to-average power ratio (PAPR) reduction for a multi-antenna transmitter using OFDM is disclosed. Similar to tone injection, a Peak reduction signal is added to the subcarriers for suppressing peaks of the transmitted signal. However different schemes summarized on FIG. 2 are proposed for such a superimposition of a peak reduction signal. Subcarriers carrying reference signals (DMRS) might not carry any peak reduction signal (FIG. 2b) or at a lower power than data subcarriers (FIG. 2c). Furthermore data subcarriers may be zeroed out to carry the peak reduction signal (resulting in tone insertion, FIG. 2d) or the modulation order of the data subcarriers might be reduced to increase the power of the peak reduction signal.

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First Claim