Peak Power Reduction for Multicarrier TransmissionJos
Peak Power Reduction for Multicarrier TransmissionJos
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发表时间：
1999
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通讯作者：
J. Cio
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作者：
J. Cio
|本文提出了两种有效的无失真方案来显著降低DMT和OFDM信号的峰均功率比。这些方法基于将符号相关的时域信号添加到原始DMT/OFDM符号以降低其峰值。该时域信号可以在发射机处被有效地计算，并且可以容易地从接收信号中剥离。对于称为音调预留（TR）的第一种方法，发射机不在载波的小子集上发送数据，这些载波针对PAR降低进行了优化。这种技术可以实现PAR降低3dB或6dB的数据率损失分别小于：2%和5%。第二种方案，称为音调注入（TI），是基于复制的子符号星座与已知的翻译矢量。在这个扩展的星座图中，几个点代表相同的信息，因此我们可以选择那些使发射机PAR最小化的点。该方法实现了超过6dB的PAR降低，而没有数据速率损失，发射机平均功率的增加可以忽略不计。
|This paper proposes two eecient and distor-tionless schemes to signiicantly reduce the Peak to Average power Ratio (PAR) of DMT and OFDM signals. These methods are based on adding a symbol dependent, time domain signal to the original DMT/OFDM symbol to reduce its peaks. This time domain signal can be computed ee-ciently at the transmitter and can be easily stripped oo the received signal. For the rst method, called Tone Reservation (TR), the transmitter does not send data on a small subset of carriers, which are optimized for PAR reduction. This technique can achieve 3dB or 6dB of PAR reduction for a loss in data rate of less than :2% and 5% respectively. The second scheme, called Tone Injection (TI), is based on replicating the subsymbol constellation with known translating vectors. In this expanded constellation several points represent the same information, and therefore we can choose those points that minimize the transmitter PAR. This method achieves more than 6dB PAR reduction without data rate loss and with negligible increase in transmitter average power.