Non-Coherent Detection and Bit Error Rate for an Ambient Backscatter Link in Time-Selective Fading
Non-Coherent Detection and Bit Error Rate for an Ambient Backscatter Link in Time-Selective Fading
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DOI：
10.1109/tcomm.2020.3028416
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发表时间：
2019-08
影响因子：
8.3
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
本文重点研究了环境后向散射通信中的非相干检测，这对于信令开销和实际数据传输之间的权衡非常关键的系统非常有吸引力。将时间选择性衰落信道建模为一阶自回归（AR）过程，提出了一种新的基于直接平均接收信号样本进行检测的接收机架构，该架构与文献中考虑的基于能量平均的接收机有很大不同。对于所提出的设置，我们的特点是精确的渐近误码率（BER）为单天线（SA）和多天线（MA）接收机，并证明了新架构的鲁棒性定时误差。我们的研究结果表明，虽然直接链路（DL）的干扰，从周围的电源导致在SA接收机的BER地板，MA接收机可以通过估计的到达角（AoA）的DL去除这种干扰。该分析进一步量化了作为接收天线数量的函数的BER上的改进的角分辨率的效果。我们的分析的一个关键的中间结果是一个新的浓度结果的一般和序列，是中央的接收信号的条件分布的推导的推导。
This paper focuses on the non-coherent detection in ambient backscatter communication, which is highly appealing for systems where the trade-off between signaling overhead and the actual data transmission is very critical. Modeling the time-selective fading channel as a first-order autoregressive (AR) process, we propose a new receiver architecture based on the direct averaging of the received signal samples for detection, which departs significantly from the energy averaging-based receivers considered in the literature. For the proposed setup, we characterize the exact asymptotic bit error rate (BER) for both single-antenna (SA) and multi-antenna (MA) receivers, and demonstrate the robustness of the new architecture to timing errors. Our results demonstrate that while the direct-link (DL) interference from the ambient power source leads to a BER floor in the SA receiver, the MA receiver can remove this interference by estimating the angle of arrival (AoA) of the DL. The analysis further quantifies the effect of improved angular resolution on the BER as a function of the number of receive antennas. A key intermediate result of our analysis is the derivation of a new concentration result for a general sum sequence that is central to the derivation of the conditional distributions of the received signal.