Revisiting the So-Called Constructive Interference in Concurrent Transmission
Revisiting the So-Called Constructive Interference in Concurrent Transmission
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DOI：
10.1109/lcn.2016.56
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发表时间：
2016-11
期刊：
影响因子：
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通讯作者：
Chun-Hao Liao;Yuki Katsumata;Makoto Suzuki;H. Morikawa
中科院分区：
文献类型：
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作者：
Chun-Hao Liao;Yuki Katsumata;Makoto Suzuki;H. Morikawa
许多研究工作将并发传输的成功接收归因于相长干涉。然而，由于不可避免的载波频率偏移（CFO）和由此产生的拍频效应，相长干涉的说法实际上是不成立的。为了澄清在CT下成功接收的原因，我们进行了广泛的评估，并确定了以下结果。1)我们表明，IEEE 802.15.4接收机生存的拍频效应主要是因为直接序列扩频（DSSS），而没有DSSS的保护系统是不适用于CT。2)我们确定了一个违反直觉的现象，IEEE 802.15.4接收器可以生存只有大CFO的跳动结果，而表现不佳时，CFO是小的。3)我们证明，即使接收机生存，CT链路导致的性能改善很少相比，传统的信号传输链路从SNR的角度来看。
Many works attributed the successful reception of concurrent transmission (CT) to the constructive interference. However, due to the inevitable carrier frequency offset (CFO) and the resulted beating effect, the claim of constructive interference is actually not valid. To clarify the reason behind the successful receptions under CT, we conduct extensive evaluations and identify the following findings. 1) We show that the IEEE 802.15.4 receivers survive the beating effect mainly because of the direct sequence spread spectrum (DSSS), while systems without the protection of DSSS are not applicable to CT. 2) We identify a counterintuitive phenomenon that the IEEE 802.15.4 receiver could survive only the beating results from large CFO, while performing poorly when CFO is small. 3) We demonstrate that, even if the receivers survive, CT links lead to little performance improvements compared to conventional signal transmission links from the SNR point of view.