Communication through collisions: Opportunistic utilization of past receptions
Communication through collisions: Opportunistic utilization of past receptions
复制标题
通过碰撞进行通信：机会主义地利用过去的接收
DOI：
10.1109/infocom.2014.6848202
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
A. Avestimehr
中科院分区：
文献类型：
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作者：
Alireza Vahid;M. Maddah;A. Avestimehr
当多个无线用户共享频谱时，数据包冲突是一种简单但广泛使用的干扰模型。在这种模型下，当发射机对任何接收机造成干扰时，它们的冲突数据包将被丢弃并需要重新传输。然而，实际上，该接收器仍然可以存储其模拟接收信号并在将来利用它来解码数据包（例如，通过连续干扰消除技术）。在这项工作中，我们提出了一种无线分组网络的物理层模型，允许接收器具有这种灵活性。我们假设发射机将在一定延迟的情况下了解信道的状态（即何时何地发生冲突，或者无意中的接收机无意中听到信号），并提出了几种编码机会，发射机可以利用这些编码机会来利用接收机处的可用信号进行干扰管理（而不是丢弃它们）。我们分析了我们的策略在具有两个发射器-接收器对的规范干扰信道中可实现的吞吐量，并展示了相对于传统方案的增益。通过推导外界，我们还证明了我们的方案对于相应模型的最优性。
When several wireless users are sharing the spectrum, packet collision is a simple, yet widely used model for interference. Under this model, when transmitters cause interference at any of the receivers, their collided packets are discarded and need to be retransmitted. However, in reality, that receiver can still store its analog received signal and utilize it for decoding the packets in the future (for example, by successive interference cancellation techniques). In this work, we propose a physical layer model for wireless packet networks that allows for such flexibility at the receivers. We assume that the transmitters will be aware of the state of the channel (i.e. when and where collisions occur, or an unintended receiver overhears the signal) with some delay, and propose several coding opportunities that can be utilized by the transmitters to exploit the available signal at the receivers for interference management (as opposed to discarding them). We analyze the achievable throughput of our strategy in a canonical interference channel with two transmitter-receiver pairs, and demonstrate the gain over conventional schemes. By deriving an outer-bound, we also prove the optimality of our scheme for the corresponding model.