Interference alignment and degrees of freedom of the K-user interference channel
Interference alignment and degrees of freedom of the K-user interference channel
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DOI：
10.1109/tit.2008.926344
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发表时间：
2008-08-01
影响因子：
2.5
通讯作者：
Jafar, Syed Ali
中科院分区：
文献类型：
--
作者：
Cadambe, Viveck R.;Jafar, Syed Ali
对于完全连接的k用户无线干扰通道，该通道系数是时间变化并从连续分布中绘制的，总和的能力被表征为c（snr）= k/2 log（snr） + o（log（log（log（log snr））） ）。因此，K用户时变干扰渠道几乎肯定具有K/2的自由度。实现性是基于干扰一致性的想法。还提供了完全连接的K用户干扰通道，该通道具有恒定（不随时间变化的）系数，在所有SNR值下，通过干扰对齐来完全实现容量。
For the fully connected K user wireless interference channel where the channel coefficients are time-varying and are drawn from a continuous distribution, the sum capacity is characterized as C(SNR) = K/2 log(SNR) + o(log(SNR)). Thus, the K user time-varying interference channel almost surely has K/2 degrees of freedom. Achievability is based on the idea of interference alignment. Examples are also provided of fully connected K user interference channels with constant (not time-varying) coefficients where the capacity is exactly achieved by interference alignment at all SNR values.