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arXiv 1307.2889cs.ITmath.IT
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利用极化编码实现通用多址信道的均匀速率域

Achieving the Uniform Rate Region of General Multiple Access Channels by Polar Coding

Hessam Mahdavifar, Mostafa El-Khamy, Jungwon Lee, Inyup Kang

摘要:

我们考虑的问题,极化编码传输$m$用户多址信道。在该方案中,所有用户使用极化编码器编码他们的消息,而多用户连续抵消解码器部署在接收端。编码在用户之间单独进行,并且独立于目标可实现速率。对于码构造,共同决定每个用户的信息比特和冻结比特的位置。这是通过将所有$m$用户之间的极坐标变换视为具有某个\emph{polarization base}的单个极坐标变换来完成的。我们的特点的统一速率区域的用户数$m$和极化基地$L$的长度的主要面对可实现的速率的分辨率。特别是,我们证明,对于任何目标率的主导面,存在一个可实现的速率,也在主导面,在距离最多$\frac{(m-1)\sqrt{m}}{L}$从目标率。然后,我们证明了所提出的MAC极化编码方案通过改变多用户连续消除解码器中的解码顺序,随着$L$和码块长度$N$变大,以足够精细的分辨率实现整个均匀速率区域。编码和解码的复杂度为$O(N \log N)$,并保证了$O(2^{-N^{0.5 - ε}})$的渐近误块概率。提供了$3$用户多址信道的可实现速率的例子。

英文摘要:

We consider the problem of polar coding for transmission over $m$-user multiple access channels. In the proposed scheme, all users encode their messages using a polar encoder, while a multi-user successive cancellation decoder is deployed at the receiver. The encoding is done separately across the users and is independent of the target achievable rate. For the code construction, the positions of information bits and frozen bits for each of the users are decided jointly. This is done by treating the polar transformations across all the $m$ users as a single polar transformation with a certain \emph{polarization base}. We characterize the resolution of achievable rates on the dominant face of the uniform rate region in terms of the number of users $m$ and the length of the polarization base $L$. In particular, we prove that for any target rate on the dominant face, there exists an achievable rate, also on the dominant face, within the distance at most $\frac{(m-1)\sqrt{m}}{L}$ from the target rate. We then prove that the proposed MAC polar coding scheme achieves the whole uniform rate region with fine enough resolution by changing the decoding order in the multi-user successive cancellation decoder, as $L$ and the code block length $N$ grow large. The encoding and decoding complexities are $O(N \log N)$ and the asymptotic block error probability of $O(2^{-N^{0.5 - ε}})$ is guaranteed. Examples of achievable rates for the $3$-user multiple access channel are provided.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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