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首页> 外文会议>Vehicular Technology Conference >A Low-Complexity Peak-to-Average Power Ratio Reduction Technique for OFDM Systems Using Guided Scrambling Coding
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A Low-Complexity Peak-to-Average Power Ratio Reduction Technique for OFDM Systems Using Guided Scrambling Coding

机译：使用导扰编码的OFDM系统的低复杂性峰值平均功率比降低技术

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One major drawback of orthogonal frequency division multiplexing schemes is the high peak-to-average power ratio (PAPR) of the output signal. Selected mapping (SLM) and partial transmit sequences (PTS) are two important techniques for reducing PAPR, but they need to transmit side information to indicate how the transmitter generates the signals. Guided scrambling (GS) SLM and GS-PTS techniques use augmenting bits to set the scrambler''s initial condition. With different patterns of the augmenting bits, different candidate signals can be generated. GS-SLM and GS-PTS do not require the transmission of side information, but they still need a bank of inverse fast Fourier transforms (IFFT''s), i.e., involving high computational complexity. In this paper, we focus on reducing the high computational complexity of the GS-SLM and GS-PTS methods. We separate the operations of the augmented data word into the operations of the augmenting bits and the operations of the source data word. Different augmenting bits are processed in advance and the results are saved into a read-only memory (ROM). The proposed methods only need one IFFT, few adders, and a ROM and thus significantly reduce the computational complexity of the original GS-SLM and GS-PTS methods. The simulation results also show that the proposed GS-SLM and GS-PTS methods have almost the same PAPR reduction performance as the original ones.
机译：正交频分复用方案的一个主要缺点是输出信号的高峰平均功率比（PAPR）。所选映射（SLM）和部分发射序列（PTS）是用于减少PAPR的两个重要技术，但是他们需要传输侧面信息以指示发射机如何产生信号。导引的加扰（GS），SLM和GS-PTS技术使用增强位设置加扰器“的初始条件。利用增强位的不同模式，可以生成不同的候选信号。 GS-SLM和GS-PTS不需要的边信息传输，但他们仍然需要逆快速傅立叶变换的银行（IFFT'的），即涉及计算复杂度高。在本文中，我们专注于降低GS-SLM和GS-PTS方法的高计算复杂性。我们将增强数据字的操作分开到增强位和源数据字的操作的操作中。提前处理不同的增强位，结果保存到只读存储器（ROM）中。所提出的方法仅需要一个IFFT，少数加法器和ROM，从而显着降低了原始GS-SLM和GS-PTS方法的计算复杂性。仿真结果还表明，所提出的GS-SLM和GS-PTS方法几乎与原始PAPR减少性能几乎相同。

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