An Asynchronous Massive Access Scheme with Dynamic Range Considerations
An Asynchronous Massive Access Scheme with Dynamic Range Considerations
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DOI：
10.1109/isit54713.2023.10206478
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发表时间：
2023-05
期刊：
影响因子：
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通讯作者：
Lina Liu;Dongning Guo
中科院分区：
文献类型：
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作者：
Lina Liu;Dongning Guo
本文研究了大规模接入的传输和接收方案在一些实际挑战下的性能。一个挑战是远近问题，即，接入点经常以非常不同的信号强度从不同的发射设备接收信号。另一个挑战是来自不同设备的信号可能会受到任意、模拟和异构延迟的影响。本文考虑了一个完全异步的模型，这是更现实的帧或符号级的同步需要在大多数现有的工作。一个主要的定理表征的渐进缩放的codelength与设备的数量，设备延迟上限，和接收信号强度的动态范围跨越设备。缩放结果表明，将具有相似接收信号强度的设备分组并让这些组使用分时的潜在优势。所提出的方案的性能进行评估，使用模拟和不分组。
This paper studies the performance of a transmission and reception scheme for massive access under some practical challenges. One challenge is the near-far problem, i.e., an access point often receives signals from different transmitting devices at vastly different signal strengths. Another challenge is that the signals from different devices may be subject to arbitrary, analog, and heterogeneous delays. This paper considers a fully asynchronous model which is more realistic than the frame or symbol level synchrony needed in most existing work. A main theorem characterizes the asymptotic scaling of the codelength with the number of devices, a device delay upper bound, and the dynamic range of received signal strengths across devices. The scaling result suggests potential advantages of grouping devices with similar received signal strengths and letting the groups use time sharing. The performance of the proposed scheme is evaluated using simulations with and without grouping.