Channel-aware ALOHA with SINR capture: When is the knowledge of channel not helpful?

2011 IEEE 22nd International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2011-09-01 DOI:10.1109/PIMRC.2011.6140086

Fu-Te Hsu, Hsuan-Jung Su

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引用次数: 3

Abstract

We consider an ALOHA network in which users have the knowledge of their own channel state information (CSI). In each time slot, each user transmits its packet to the base station (BS) according to a CSI-dependent transmission scheme. A packet is successfully received if its signal to interference plus noise ratio (SINR) is larger than the capture ratio. We analyze the throughput of this network under a threshold-based transmission scheme in which a user transmits only when its channel gain is higher than a threshold. It is shown that in some cases the conventional ALOHA transmission scheme without CSI may outperform the threshold-based transmission scheme in terms of the maximum possible throughput. We give the condition for this phenomenon and find that this phenomenon will not occur if the BS is capable of receiving three or more packets simultaneously. Besides, we present a transmission scheme in which a user only transmits when its channel gain lies in an interval. This scheme includes the threshold-based one as a special case.

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带SINR捕获的信道感知ALOHA:什么时候信道知识没有用?

我们考虑一个ALOHA网络，其中用户知道他们自己的通道状态信息(CSI)。在每个时隙中，每个用户根据依赖于csi的传输方案向基站(BS)传输其数据包。如果数据包的信噪比(SINR)大于捕获比，则数据包被成功接收。我们在基于阈值的传输方案下分析了该网络的吞吐量，其中用户仅在其信道增益高于阈值时传输。结果表明，在某些情况下，没有CSI的传统ALOHA传输方案在最大可能吞吐量方面可能优于基于阈值的传输方案。我们给出了这种现象的条件，并发现如果BS能够同时接收三个或三个以上的数据包，则不会发生这种现象。此外，我们还提出了一种用户仅在信道增益处于一定间隔时才进行传输的方案。该方案包括基于阈值的方案作为一种特殊情况。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2011 IEEE 22nd International Symposium on Personal, Indoor and Mobile Radio Communications

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