PAPR Reduction Method for OFDM Signal by Using Dummy Sub-carriers
PAPR Reduction Method for OFDM Signal by Using Dummy Sub-carriers
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DOI：
10.1093/ietcom/e91-b.3.784
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发表时间：
2005-07
期刊：
影响因子：
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通讯作者：
P. Boonsrimuang;K. Mori;T. Paungma;Hideo Kobayashi
中科院分区：
文献类型：
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作者：
P. Boonsrimuang;K. Mori;T. Paungma;Hideo Kobayashi
OFDM的缺点之一是其时域信号的峰均功率比（PAPR）较大。在非线性信道中，由于互调噪声的存在，较大的峰均比信号会导致误码性能的严重下降。本文提出了一种改进的DSI（Dummy Sequence Insertion）方法，该方法可以获得更好的PAPR和BER性能。该方法的特点是通过改变时域信号中所有预定的相位系数来优化每个虚拟子载波的相位，从而降低PAPR性能，该相位系数分别为数据子载波和虚拟子载波计算。为了获得更好的PAPR性能，本文还提出了采用时频域交换算法对虚子载波相位系数进行微调，与传统的DSI方法相比，该方法处理复杂度较低，PAPR和BER性能较好。本文给出了各种计算机仿真结果，以验证所提出的方法的有效性相比，传统的方法在非线性信道。
One of the disadvantages of using OFDM is the larger peak to averaged power ratio (PAPR) in its time domain signal. The larger PAPR signal would course the fatal degradation of bit error rate performance (BER) due to the inter-modulation noise in the non-linear channel. This paper proposes an improved DSI (Dummy Sequence Insertion) method, which can achieve the better PAPR and BER performances. The feature of proposed method is to optimize the phase of each dummy sub-carrier so as to reduce the PAPR performance by changing all predetermined phase coefficients in the time domain signal, which is calculated for data sub-carriers and dummy sub-carriers separately. To achieve the better PAPR performance, this paper also proposes to employ the time-frequency domain swapping algorithm for fine adjustment of phase coefficient of the dummy subcarriers, which can achieve the less complexity of processing and achieves the better PAPR and BER performances than those for the conventional DSI method. This paper presents various computer simulation results to verify the effectiveness of proposed method as comparing with the conventional methods in the non-linear channel.