基于扫频二进制偏移副载波的伪码扩频调制体制及其特性的研究
doi: 10.11999/JEIT140824
A Novel Pseudo-code Spread Spectrum Modulation Scheme of Frequency Chirp Binary Offset Garrier and Its Characteristics
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摘要: 该文基于常规二进制偏移载波(BOC)调制体制的数学模型，提出一种新型的基于扫频二进制偏移载波调制(FC-BOC)的伪码扩频体制。在这种调制体制中，BOC调制体制数学模型中的固定频率二进制偏移载波被改进为线性扫频二进制偏移载波，使之不仅继承了BOC信号的性质，还具有更加独特的性质。仿真研究和算法实验表明：FC-BOC调制体制保留了BOC调制体制的主要优点，特别是具有狭窄的主相关峰和出色的副峰抑制特征而避免了多相关峰模糊性，功率谱密度函数呈现类似带通白噪声功率谱密度函数的形态。FC-BOC调制体制信号生成算法、接收算法的结构与常规BOC调制体制类似，算法复杂度相当于常规BOC调制体制，适合纯数字编程设计实现。
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关键词:
- 伪码扩频调制 /
- 二进制偏移载波 /
- 多相关峰模糊 /
- 扫频二进制偏移载波调制 /
- 副峰抑制
Abstract: In this paper, based on the mathematical model of conventional Binary Offset Carrier (BOC) modulation, a novel pseudo-code spread spectrum modulation scheme of Frequency Chirp Binary Offset Carrier (FC-BOC) is proposed. FC-BOC modulation scheme is constructed by introducing the binary offset carrier of frequency chirp instead of binary offset carrier of fixed frequency in the conventional BOC modulation mathematical model. Therefore, FC-BOC signal has a lot of characteristics inherited from BOC signal and several unique characteristics. Simulation and algorithm experiment show that the FC-BOC modulation scheme retains the primary advantages of BOC modulation, moreover, the FC-BOC signal acquires a narrow and sharp correlation main-peak with extremely suppressed side-peaks for avoiding multiple correlation peak ambiguity naturally, flat power spectral density function similar to band-pass white noise. FC-BOC modulation systems, either signal generating algorithms or signal receiving algorithms, have similar structure and equivalent complexity to conventional BOC modulation. -
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