非周期擴頻系統(tǒng)中基于均勻圓陣的角度和時延的聯(lián)合估計
Joint angle and delay estimation based on uniform circular array in CDMA system with aperiodic spreading code
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摘要: 該文通過空域匹配濾波器,將陣元空間中的均勻圓陣轉(zhuǎn)化為波束空間中的均勻線陣,并將時空匹配濾波器的輸出轉(zhuǎn)換到頻域,利用 DOA Matrix方法解決了非周期擴頻系統(tǒng)中均勻圓陣條件下多徑信號的角度和時延的聯(lián)合估計問題及常規(guī)空域處理方法中多徑數(shù)不能大于陣元數(shù)的問題。理論分析和仿真實驗結(jié)果表明,該方法是一種無偏估計,且其估計精度遠遠高于滑動相關(guān)方法。
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關(guān)鍵詞:
- 角度和時延的聯(lián)合估計; 非周期擴頻系統(tǒng); 波束空間; 相位模式
Abstract: The uniform circular array is transformed into uniform linear array by the spatial matched filter transformation from element space to beam space. Based on the space-time matched filter output in frequency domain, the joint angle and delay estimation with uniform circular array in aperiodic spreading system is solved with DOA matrix method. The joint estimation algorithm also solved the problem, that the multipath number can not be larger than the element number in conventional spatial processing method. The theoretical analysis and computer simulations demonstrate that the method is an unbiased estimator and its estimation precision is superior to that of the sliding correlator. -
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