A Signal-Space Aligned Network Coding Approach to Distributed MIMO
This paper studies an uplink distributed MIMO (DMIMO) system that consists of K users and K' distributed base stations (BSs), where the BSs are connected to a central unit (CU) via independent rate-constrained backhaul (BH) links. We propose anew signal-space aligned network coding scheme. Firs...
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| Vydáno v: | IEEE transactions on signal processing Ročník 65; číslo 1; s. 27 - 40 |
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| Hlavní autoři: | , , |
| Médium: | Journal Article |
| Jazyk: | angličtina |
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New York
IEEE
01.01.2017
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
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| ISSN: | 1053-587X, 1941-0476 |
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| Abstract | This paper studies an uplink distributed MIMO (DMIMO) system that consists of K users and K' distributed base stations (BSs), where the BSs are connected to a central unit (CU) via independent rate-constrained backhaul (BH) links. We propose anew signal-space aligned network coding scheme. First, a network coding generator matrix is selected subject to certain structural properties. Next, distributed linear precoding is employed by the users to create aligned signal-spaces at the BSs, according to the pattern determined by the network coding generator matrix. For each aligned signal-space at a BS, physical-layer network coding is utilized to compute the corresponding network-coded (NC) messages, where the actual number of NC messages forwarded to the CU is determined by the BH rate-constraint. We derive an achievable rate of the proposed scheme based on the existence of the NC generator matrix and signal-space alignment precoding matrices. For DMIMO with two and three BSs, the achievable rates and degrees of freedom (DoF) are evaluated and shown to outperform existing schemes. For example, for DMIMO with two BSs where each user and BS have N and N' antennas, respectively, the proposed scheme achieves a DoF of 2 min (N, N') - 1, if the BH capacity scales like (2 min (N, N') - 1) log SNR. This leads to greater DoF compared to that utilizes the strategy for interference channel, whose DoF is min (N, N'). Numerical results demonstrate the performance advantage of the proposed scheme. |
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| AbstractList | This paper studies an uplink distributed MIMO (DMIMO) system that consists of K users and K' distributed base stations (BSs), where the BSs are connected to a central unit (CU) via independent rate-constrained backhaul (BH) links. We propose anew signal-space aligned network coding scheme. First, a network coding generator matrix is selected subject to certain structural properties. Next, distributed linear precoding is employed by the users to create aligned signal-spaces at the BSs, according to the pattern determined by the network coding generator matrix. For each aligned signal-space at a BS, physical-layer network coding is utilized to compute the corresponding network-coded (NC) messages, where the actual number of NC messages forwarded to the CU is determined by the BH rate-constraint. We derive an achievable rate of the proposed scheme based on the existence of the NC generator matrix and signal-space alignment precoding matrices. For DMIMO with two and three BSs, the achievable rates and degrees of freedom (DoF) are evaluated and shown to outperform existing schemes. For example, for DMIMO with two BSs where each user and BS have N and N' antennas, respectively, the proposed scheme achieves a DoF of 2 min (N, N') - 1, if the BH capacity scales like (2 min (N, N') - 1) log SNR. This leads to greater DoF compared to that utilizes the strategy for interference channel, whose DoF is min (N, N'). Numerical results demonstrate the performance advantage of the proposed scheme. This paper studies an uplink distributed MIMO (DMIMO) system that consists of [Formula Omitted] users and [Formula Omitted] distributed base stations (BSs), where the BSs are connected to a central unit (CU) via independent rate-constrained backhaul (BH) links. We propose a new signal-space aligned network coding scheme. First, a network coding generator matrix is selected subject to certain structural properties. Next, distributed linear precoding is employed by the users to create aligned signal-spaces at the BSs, according to the pattern determined by the network coding generator matrix. For each aligned signal-space at a BS, physical-layer network coding is utilized to compute the corresponding network-coded (NC) messages, where the actual number of NC messages forwarded to the CU is determined by the BH rate-constraint. We derive an achievable rate of the proposed scheme based on the existence of the NC generator matrix and signal-space alignment precoding matrices. For DMIMO with two and three BSs, the achievable rates and degrees of freedom (DoF) are evaluated and shown to outperform existing schemes. For example, for DMIMO with two BSs where each user and BS have [Formula Omitted] and [Formula Omitted] antennas, respectively, the proposed scheme achieves a DoF of [Formula Omitted], if the BH capacity scales like [Formula Omitted]. This leads to greater DoF compared to that utilizes the strategy for interference channel, whose DoF is [Formula Omitted]. Numerical results demonstrate the performance advantage of the proposed scheme. |
| Author | Sun, Qifu Tyler Tao Yang Xiaojun Yuan |
| Author_xml | – sequence: 1 surname: Tao Yang fullname: Tao Yang email: tao.yang@uts.edu.au organization: Global Big Data Technol. Centre, Univ. of Technol. Sydney, Ultimo, NSW, Australia – sequence: 2 surname: Xiaojun Yuan fullname: Xiaojun Yuan email: yuanxj@shanghaitech.edu.cn organization: Sch. of Inf. Sci. & Technol., ShanghaiTech Univ., Shanghai, China – sequence: 3 givenname: Qifu Tyler surname: Sun fullname: Sun, Qifu Tyler email: qfsun@ustb.edu.cn organization: Sch. of Comput. & Commun. Eng., Univ. of Sci. & Technol. Beijing, Beijing, China |
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| SubjectTerms | Base stations Cloud RAN Coding CoMP compute-and-forward Degrees of freedom distributed MIMO Generators interference alignment Interference channels Messages MIMO MIMO communication Network coding physical-layer network coding Uplink |
| Title | A Signal-Space Aligned Network Coding Approach to Distributed MIMO |
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