Multi-antenna Non-coherent Detection of Ambient Backscatter under Time-Selective Fading
Multi-antenna Non-coherent Detection of Ambient Backscatter under Time-Selective Fading
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DOI：
10.1109/globecom42002.2020.9348195
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
J. K. Devineni;Harpreet S. Dhillon
中科院分区：
文献类型：
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作者：
J. K. Devineni;Harpreet S. Dhillon
由于非相干接收机在没有信道状态信息（CSI）的情况下进行操作的固有能力，非相干接收机非常适合于环境反向散射设备，允许它们与非合作主用户共存。在这项工作中，我们分析了环境后向散射系统采用非相干检测在时间选择性衰落信道（建模使用一阶自回归（AR）过程）的性能。通过推导直接链路（DL）相消后天线增益的表达式，描述了多天线（MA）接收机的误码率（BER）。此外，该分析还捕获了具有两个以上天线的MA接收机中的附加角分辨率，这使得我们即使在DL和反向散射链路（BL）的到达角（AoA）几乎相似时也能够确保合理的性能。
Due to their inherent ability to operate without the channel state information (CSI), non-coherent receivers are highly suitable for ambient backscatter devices, allowing them to co-exist alongside the non-cooperative primary users. In this work, we analyze the performance of an ambient backscatter system employing non-coherent detection in a time-selective fading channel (modeled using the first order autoregressive (AR) process). We characterize the bit error rate (BER) of a multiantenna (MA) receiver by deriving the expression for antenna gain achievable after the direct link (DL) cancellation. In addition, the analysis also captures the additional angular resolution in a MA receiver with more than two antennas, which allows us to ensure reasonable performance even when the angles of arrival (AoAs) of the DL and backscatter link (BL) are almost similar.