| A combination of multiple-input multiple-output (MIMO) with orthogonal frequency division multiplexing (OFDM) has became a promising candidate for high performance 4G broadband wireless communications. However, like OFDM, one main disadvantage of MIMO-OFDM is that the signals transmitted on different antennas may exhibit a prohibitively large peak-to-average power ratio (PAPR). In this paper we extend the formulation of the reduction of the PAPR problem as second order cone programming problem (SOCP) [1] to MIMOOFDM. The investigated PAPR reduction method is originally based on a particular case of tone reservation (TR) approach which uses the unused carriers of standards. This approach does not degrade the bit-error-rate (BER) or the data rate and no side information (SI) is required. Simulation results are presented for a MIMO-OFDM system with two antennas and 256 carriers as in IEEE 802.16 WiMAX standard. |
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