针对MIMO-NOMA系统中配对弱用户的空时编码方案

doi:10.11959/j.issn.1000-436x.2018109

通信学报 ›› 2018, Vol. 39 ›› Issue (6): 181-189.doi: 10.11959/j.issn.1000-436x.2018109

针对MIMO-NOMA系统中配对弱用户的空时编码方案

龚明言¹,杨震^1,²

¹ 南京邮电大学通信与信息工程学院，江苏南京 210003
² 南京邮电大学宽带无线通信和传感网技术教育部重点实验室，江苏南京210003

修回日期:2018-05-14 出版日期:2018-06-01 发布日期:2018-07-09
作者简介:龚明言（1992-），男，江苏淮安人，南京邮电大学硕士生，主要研究方向为非正交多址、天线分集。|杨震（1961-），男，江苏苏州人，南京邮电大学教授、博士生导师，主要研究方向为无线通信中的通信与信号处理技术、新的压缩感知和非线性自适应语音信号处理理论。
基金资助:
国家自然科学基金资助项目(61671252)

Space-time coding scheme for the paired weak user in MIMO-NOMA systems

Mingyan GONG¹,Zhen YANG^1,²

¹ School of Communication and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China
² Key Lab of Broadband Wireless Communication and Sensor Network Technology,Ministry of Education,Nanjing University of Posts and Telecommunications,Nanjing 210003,China

Revised:2018-05-14 Online:2018-06-01 Published:2018-07-09
Supported by:
The National Natural Science Foundation of China(61671252)

摘要/Abstract

摘要：

鉴于多天线—非正交多址（MIMO-NOMA）系统中配对弱用户较差的中断性能，采用 Alamouti 码为弱用户编码，利用其分集作用来改善弱用户的中断性能，并推导出所提模型中强用户各态历经容量的闭合表达式以及弱用户各态历经容量、中断概率的边界表达式。另外，提出了一种优化系统吞吐量的功率分配算法。最后，数值结果验证了所推表达式的准确性和所提算法的有效性，也证实了所提编码方案中弱用户的中断性能要远优于目前只采用垂直分层空时码（V-BLAST）编码方案中弱用户的中断性能。

关键词: 非正交多址, 多天线, Alamouti码, 配对用户, 空时编码

Abstract:

In view of the paired weak user’s poor outage performance in multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) systems,Alamouti code was adopted to encode for the weak user in order to improve its outage performance by means of diversity,and the closed-form expression of the strong user’s ergodic capacity as well as the boundary-form expressions of the weak user’s ergodic capacity and outage probability was derived in the proposed model.Moreover,a power allocation algorithm for optimizing the system’s throughput was proposed.Finally,the numerical results show the accuracy of the derived expressions,the efficacy of the proposed algorithm,and that the weak user’s outage performance in the proposed coding scheme is far superior to that in the current coding scheme only adopting vertical Bell lab layered space-time (V-BLAST) code.

Key words: NOMA, MIMO, Alamouti code, paired users, space-time coding

中图分类号:

TN929.5

龚明言,杨震. 针对MIMO-NOMA系统中配对弱用户的空时编码方案[J]. 通信学报, 2018, 39(6): 181-189.

Mingyan GONG,Zhen YANG. Space-time coding scheme for the paired weak user in MIMO-NOMA systems[J]. Journal on Communications, 2018, 39(6): 181-189.

图/表 9

图1

表1

不同时间片的发送信息内容"

发送信息	第1个时间片(n=1)	第2个时间片(n=2)
$S_{n}$	$\sqrt{α P} (\begin{matrix} s_{1}^{1} \\ s_{2}^{1} \end{matrix}) + \sqrt{β P} (\begin{matrix} s_{1}^{2} \\ s_{2}^{2} \end{matrix})$	$\sqrt{α P} (\begin{matrix} s_{3}^{1} \\ s_{4}^{1} \end{matrix}) + \sqrt{β P} (\begin{matrix} (s_{2}^{2})^{} \\ - (s_{1}^{2})^{} \end{matrix})$

表1

表2

强用户不同时间片接收信息内容"

接收信息	第1个时间片(n=1)	第2个时间片(n=2)
$y_{n_{1}}^{1}$	$\| \| h_{1} \| \| (\sqrt{α P} s_{1}^{1} + \sqrt{β P} s_{1}^{2}) + n_{11}^{1}$	$\|\| h_{1} \| \| (\sqrt{α P} s_{3}^{1} + \sqrt{β P} (s_{2}^{2})^{*}) + n_{21}^{1}$
$y_{n_{2}}^{1}$	$\| \| h_{2} \| \| (\sqrt{α P} s_{2}^{1} + \sqrt{β P} s_{2}^{2}) + n_{12}^{1}$	$\| \| h_{2} \| \| (\sqrt{α P} s_{4}^{1} - \sqrt{β P} (s_{1}^{2})^{*}) + n_{22}^{1}$

表2

表3

弱用户不同时间片接收信息内容"

接收信息	第1个时间片(n=1)	第2个时间片(n=2)
$y_{n_{1}}^{2}$	$a \| \| h_{1} \| \| (\sqrt{α P} s_{1}^{1} + \sqrt{β P} s_{1}^{2}) + n_{11}^{2}$	$a \| \| h_{1} \| \| (\sqrt{α P} s_{3}^{1} + \sqrt{β P} (s_{2}^{2})^{*}) + n_{21}^{2}$
$y_{n_{2}}^{2}$	$a \| \| h_{2} \| \| (\sqrt{α P} s_{2}^{1} + \sqrt{β P} s_{2}^{2}) + n_{12}^{2}$	$a \| \| h_{2} \| \| (\sqrt{α P} s_{4}^{1} - \sqrt{β P} (s_{1}^{2})^{*}) + n_{22}^{2}$

表3

表4

强用户不同时间片SIC后信息内容"

SIC后信息	第1个时间片(n=1)	第2个时间片(n=2)
$r_{n_{1}}$	$\| \| h_{1} \| \| \sqrt{α P} s_{1}^{1} + n_{11}^{1}$	$\| \| h_{1} \| \| \sqrt{α P} s_{3}^{1} + n_{21}^{1}$
$r_{n_{2}}$	$\| \| h_{2} \| \| \sqrt{α P} s_{2}^{1} + n_{12}^{1}$	$\| \| h_{2} \| \| \sqrt{α P} s_{4}^{1} + n_{22}^{1}$

表4

图2

图3

图4

图5

参考文献 16

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针对MIMO-NOMA系统中配对弱用户的空时编码方案

Space-time coding scheme for the paired weak user in MIMO-NOMA systems

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