Delay-rate tradeoff for ergodic interference alignment in the Gaussian case
Delay-rate tradeoff for ergodic interference alignment in the Gaussian case
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DOI：
10.1109/allerton.2010.5707028
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发表时间：
2010-01
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影响因子：
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通讯作者：
Joseph C. Koo;William Wu;John T. Gill
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文献类型：
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作者：
Joseph C. Koo;William Wu;John T. Gill
在干扰对齐中，共享无线信道的用户无论用户数量多少，每个用户都能够实现高达非干扰信道容量一半的数据速率。在遍历设置中，这是通过对互补信道实现来实现的，以便放大信号和消除干扰。然而，这种方案有可能在解码消息符号时产生较大的延迟。我们表明可以通过使用可能超过两个通道实现的输出来减轻延迟，尽管数据速率可能会降低。我们进一步演示了通过分时策略在速率和延迟之间的权衡。我们的分析考虑高斯通道；扩展到有限场通道也是可能的。
In interference alignment, users sharing a wireless channel are each able to achieve data rates of up to half of the non-interfering channel capacity, no matter the number of users. In an ergodic setting, this is achieved by pairing complementary channel realizations in order to amplify signals and cancel interference. However, this scheme has the possibility for large delays in decoding message symbols. We show that delay can be mitigated by using outputs from potentially more than two channel realizations, although data rate may be reduced. We further demonstrate the tradeoff between rate and delay via a time-sharing strategy. Our analysis considers Gaussian channels; an extension to finite field channels is also possible.