| 摘要: |
| 某短波协议定义了最新的宽带短波波形，其中零号波形采用了Walsh正交扩频加扰的复杂调制方式。针对该种宽带波形接收处理，提出了一种查表式、免解扰的直接解扩方法，利用含扰码序列的本地解扩矩阵对数据解扩。在逐符号方法因均衡器不收敛导致解扩结果可信度较低时新方法的结果仍保持较高可信度。参考该协议条件，对 6 kHz、 12 kHz 和 48 kHz 三种带宽零号波形处理进行仿真，所提方法与协议描述相比有明显的性能增益。 |
| 关键词: 宽带短波（WBHF）波形 Walsh正交扩频调制 直接解扩 |
| DOI： |
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| 基金项目:国防科技重点实验室基金（6142413190105） |
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| Direct-despreading processing method for a wideband HF waveform |
| XUE Guangwei,QU Wenzhong,LIU Jing |
| (1.School of Information System Engineering,Information Engineering University;2.National Key Laboratory of Science and Technology on Blind Signal Processing) |
| Abstract: |
| A shortwave protocol defines the latest wideband high frequency radio modem waveforms,among which the zero number waveform adopts the complex modulation method of scrambling Walsh orthogonal spread spectrum.To receive and process this kind of broadband waveform,a direct despreading method with look up table and no need to descrambling is proposed,which uses a local despreading matrix containing scrambling code sequences to despread the data.The reliability of the new method is still high when the symbol by symbol method does not converge due to the non convergence of the equalizer.Reference to the protocol conditions,the zero number waveform processing with bandwidth of 6 kHz,12 kHz and 48 kHz is simulated,and the proposed method has obvious performance gain compared with the protocol description. |
| Key words: wideband HF(WBHF) waveform Walsh orthogonal spread spectrum modulation direct despreading |
