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A high peak-to-average power ratio (PAPR) is one of the serious disadvantages of an orthogonal frequency-division multiplexing (OFDM) system. Therefore, many PAPR reduction methods have been introduced. Especially, the signal scrambling methods such as selective mapping (SLM), partial transmit sequences (PTS), and polyphase interleaving and inversion (PII) are the attractive methods for obtaining a better PAPR property because the methods do not cause signal distortion. The multiple-input multiple-output (MIMO)-OFDM systems also have the high PAPR like the OFDM systems. In this paper, the partial shift sequence (PSS) method is proposed because it has a good PAPR reduction performance and low computational complexity. The PSS method is compared with the PII method in terms of the complementary cumulative distribution function (CCDF).