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Minimization of PAPR in MIMO-OFDM Systems by Tone Reservation Techniques and Pilot Tones

机译:通过音调保留技术和导频音使MIMO-OFDM系统中的PAPR最小化

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In this paper a method that mixes tone reservation (TR) techniques and phase information of the pilot tones to efficiently reduce the peak to average power ratio (PAPR) of the multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) signals is presented. First, we utilize convex optimization techniques to design dummy symbols to unused or reserved set of subcarriers to reduce the PAPR of the transmitted data in an OFDM symbol. Then, to the pilot tones dedicated for channel estimation, we design phase information to further reduce the PAPR. To design phase information of the pilot tones in MIMO-OFDM systems, we resort to the previously proposed cross entropy (CE) optimization techniques used for pilot phase design in single input single output (SISO) OFDM systems. Simulation results show that, by mixing the dummy symbols and pilot phase information the PAPR of the MIMOOFDM signals can be effectively reduced.
机译:本文提出了一种混合音频保留(TR)技术和导频音频信息以有效降低多输入多输出(MIMO)正交频分复用(OFDM)信号的峰均功率比(PAPR)的方法。提出了。首先,我们利用凸优化技术将伪码元设计为未使用或保留的子载波集,以降低OFDM码元中传输数据的PAPR。然后,对于专用于信道估计的导频音,我们设计相位信息以进一步降低PAPR。为了设计MIMO-OFDM系统中导频音的相位信息,我们求助于先前提出的交叉熵(CE)优化技术,用于单输入单输出(SISO)OFDM系统中的导频相位设计。仿真结果表明,通过混合虚拟符号和导频相位信息,可以有效降低MIMOOFDM信号的PAPR。

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