基于掃頻二進制偏移副載波的偽碼擴頻調(diào)制體制及其特性的研究
doi: 10.11999/JEIT140824 cstr: 32379.14.JEIT140824
基金項目:
國家863計劃項目(2013AA70540xx)資助課題
A Novel Pseudo-code Spread Spectrum Modulation Scheme of Frequency Chirp Binary Offset Garrier and Its Characteristics
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摘要: 該文基于常規(guī)二進制偏移載波(BOC)調(diào)制體制的數(shù)學模型，提出一種新型的基于掃頻二進制偏移載波調(diào)制(FC-BOC)的偽碼擴頻體制。在這種調(diào)制體制中，BOC調(diào)制體制數(shù)學模型中的固定頻率二進制偏移載波被改進為線性掃頻二進制偏移載波，使之不僅繼承了BOC信號的性質(zhì)，還具有更加獨特的性質(zhì)。仿真研究和算法實驗表明：FC-BOC調(diào)制體制保留了BOC調(diào)制體制的主要優(yōu)點，特別是具有狹窄的主相關峰和出色的副峰抑制特征而避免了多相關峰模糊性，功率譜密度函數(shù)呈現(xiàn)類似帶通白噪聲功率譜密度函數(shù)的形態(tài)。FC-BOC調(diào)制體制信號生成算法、接收算法的結構與常規(guī)BOC調(diào)制體制類似，算法復雜度相當于常規(guī)BOC調(diào)制體制，適合純數(shù)字編程設計實現(xiàn)。
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關鍵詞:
- 偽碼擴頻調(diào)制 /
- 二進制偏移載波 /
- 多相關峰模糊 /
- 掃頻二進制偏移載波調(diào)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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