物理層超高頻射頻識別標(biāo)簽信號分離中的信道估計
doi: 10.11999/JEIT150476
基金項(xiàng)目:
國家自然科學(xué)基金(61262091)，云南省第十七批中青年學(xué)術(shù)和技術(shù)帶頭人資助項(xiàng)目(2014HB019)，云南省教育廳科學(xué)基金重點(diǎn)項(xiàng)目(2014Z093)，云南民族大學(xué)研究生創(chuàng)新基金項(xiàng)目(2015YJCXY254)
Channel Estimation for Recovery of UHF RFID Tag Collision on Physical Layer
Funds:
The National Natural Science Foundation of China (61262091), The 17th Batches of Young and Middle-aged Leaders in Academic and Technical Reserved Talents Project of Yunnan Province (2014HB019), The Project of Scientific Research Foundation of Yunnan Provincial Department of Education (2014Z093), The Project of Postgraduate Innovation Foundation of Yunnan Minzu University (2015YJCXY254)
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摘要: 在被動式的超高頻(UHF)射頻識別(RFID)系統(tǒng)中，當(dāng)多個標(biāo)簽選擇同一個時隙向閱讀器發(fā)送信息，標(biāo)簽間沖突就會產(chǎn)生，該沖突通常只在介質(zhì)訪問控制(MAC)層上解決。其實(shí)，若沖突信號在物理層上被分離，識別效率將能得到很大的提高。在物理層沖突信號分離中，信道估計是一項(xiàng)關(guān)鍵技術(shù)，因?yàn)楹玫男诺拦烙嬘兄跍?zhǔn)確地恢復(fù)沖突信號。傳統(tǒng)的信道估計方法在兩個標(biāo)簽沖突的情況下具有較好的估計性能，但當(dāng)沖突標(biāo)簽數(shù)超過2時，卻會產(chǎn)生較高的誤差。該文針對物理層的UHF RFID信號分離問題，提出一種新的信道估計方法。該方法利用已知的前綴信號，采用最小二乘方法對信道進(jìn)行估計。從實(shí)驗(yàn)結(jié)果看，當(dāng)標(biāo)簽沖突數(shù)超過2時，該文提出的信道估計方法的誤差要小于傳統(tǒng)的估計方法，而且估計的信道得到的分離效率也高于傳統(tǒng)方法。
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關(guān)鍵詞:
- 射頻識別 /
- 標(biāo)簽沖突 /
- 信號分離 /
- 信道估計 /
- 最小二乘
Abstract: In a passive Ultra-High Frequency (UHF) Radio Frequency IDentification (RFID) system, when multiple tags choose a same time slot to send information to a reader, tag collision will occur. Generally, the collision is resolved only on a Medium Access Control (MAC) layer. In fact, the collision could be separated on a physical layer, and the efficiency of system identification could be advanced. In the physical layer separation, channel estimation is one of key techniques because good estimation could help to correctly recover the collided signals. Conventional channel estimates work well under the environment of two collided tags. When the number of collided tags is beyond two, however, the conventional channel estimates have more estimation errors. In this paper, a novel channel estimate method is proposed for the passive UHF RFID signal separation on physical layer. The proposed method uses the information of preambles which is a-priori known for a reader and applies a Least-Square (LS) criterion to estimate the channel parameters. From numerical results, the estimation errors of the proposed method are lower than the conventional methods under the number of collided tags is more than two. And, the separation efficiency of the proposed methods is also higher. -
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