一种低峰均比的新型调制波形设计
首发时间:2022-01-25
摘要:为解决无人机OFDM系统发射信号的高峰均比(PAPR)问题,本文从正交预编码的角度提出了一种基于具有理想周期自相关函数的完备序列构造正交预编码矩阵的方法,构造出的预编码矩阵为酉矩阵和循环矩阵,每行每列仅有2个非零复数且属于集合$\left\{ {\pm {e^{j\theta }}} \right\}$,使用该类矩阵图样进行预编码, 能够得到一种具有低峰均比特性的新型调制波形。仿真结果表明,设计出的新型调制波形能够在不损失系统误码率的情况下峰均比抑制性能超过多数已有的预编码方案,且具有较低的技术实现复杂度。
关键词: 正交频分复用(OFDM),峰均比(PAPR),正交预编码,完备序列
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A Novel Modulation Waveform Design Method with Reduced PAPR
Abstract:In order to overcome the high peak-to-average-power radio problem of the transmitted signal of the UAV OFDM system, the present paper proposes a novel orthogonal precoding method based on a perfect sequence with ideal periodic auto-correlation function. The constructed precoding matrix is unitary and circular containing at only 2 constant-amplitude non-zero complex numbersof $\left\{ {\pm {e^{j\theta }}} \right\}$. Simulation results show that the designed new modulation waveform can achieve better PAPR performance than most existing precoding schemes without losing BER performance, and has a lower computational complexity.
Keywords: Orthogonal Frequency Division Multiplexing(OFDM) Peak to Average Power Ratio(PAPR) Orthogonal Precoding Perfect Sequence
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