多路延遲正交合成的多徑信道射頻干擾對消

劉建成; 全厚德; 李召瑞; 劉東林; 趙宏志

doi:10.11999/JEIT160521

多路延遲正交合成的多徑信道射頻干擾對消

doi: 10.11999/JEIT160521

1.
(軍械工程學(xué)院信息工程系石家莊 050003) ②(電子科技大學(xué)通信抗干擾技術(shù)國家級重點(diǎn)實(shí)驗(yàn)室成都 611731)

基金項(xiàng)目:

國家自然科學(xué)基金(61531009, 61501093, 61271164, 61471108)

計(jì)量
- 文章訪問數(shù): 1461
- HTML全文瀏覽量: 249
- PDF下載量: 342
- 被引次數(shù): 0
出版歷程
- 收稿日期: 2016-05-23
- 修回日期: 2016-10-09
- 刊出日期: 2017-03-19

RF Interference Cancellation Based on Multi-tap Delay and Orthogonal Combination in Multipath Channel

1.
(Department of Information Engineering, Ordnance Engineering College, Shijiazhuang 050003, China)
2.
(National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu 611731, China)

Funds:

The National Natural Science Foundation of China (61531009, 61501093, 61271164, 61471108)

摘要

摘要: 該文針對單路延遲對消系統(tǒng)不能有效解決多徑信道的超短波無線電臺(tái)共址干擾消除問題，給出了等間隔多路延遲正交合成的射頻干擾對消方案，進(jìn)而提出了新的衰減系數(shù)求解方法。在設(shè)定時(shí)間延遲范圍和參考信號(hào)路數(shù)基礎(chǔ)上，該方法通過迭代加權(quán)實(shí)時(shí)有效估計(jì)多路參考信號(hào)的相關(guān)矩陣，接收信號(hào)與參考信號(hào)的相關(guān)向量，進(jìn)而求解維納霍夫方程得到各路衰減系數(shù)，有效抑制多徑信道的自干擾，克服了已有方法需同時(shí)調(diào)節(jié)幅度和相位，以及相關(guān)向量和相關(guān)矩陣估計(jì)精度低的不足。另外，理論分析了衰減系數(shù)的求解過程，并推導(dǎo)了自干擾對消比的閉合表達(dá)式。分析和仿真結(jié)果表明，該方法在一定延遲誤差情況下，可獲得90 dB以上的對消比，比已有方法提高了約9 dB，有效解決了多徑信道的射頻干擾對消問題。
- 共址干擾 /
- 射頻自干擾對消 /
- 多徑信道 /
- 對消比
Abstract: The one delay tap cancellation system is weakly to suppress the co-site interference between the Very High Frequency (VHF) radios in multipath channel. To overcome this obstacle, a Radio Frequency (RF) interference cancellation scheme based on the multi-tap delay and orthogonal combination is presented, as well as a new solving attenuation coefficients method. Considering the fixed delay scale and the number of taps, this method accurately estimates the reference signal autocorrelation matrix and the cross-correlation vector between reference signals and received signal on the basis of instantaneous and iterative weighted averaging. The attenuation coefficients are achieved by solving Wiener-Hopf equation via the estimated autocorrelation matrix and cross-correlation vector. Compared with the existing approaches, this method does not need to adjust and control the amplitudes as well as the phases of reference signals simultaneously, and it improves the accuracy of estimating cross-correlation vector and autocorrelation matrix. In addition, the closed-form expression of self-interference cancellation ratio is derived through theoretically analyzing the attenuation coefficients solution. The analysis and simulation results show that the proposed method could obtain self-interference cancellation ratio of more than 90 dB, which is about 9 dB higher than the existing method. This study is significant for eliminating RF self-interference in multipath channel.
- Co-site interference /
- RF interference cancellation /
- Multipath channel /
- Cancellation ratio

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