LTE-Hi系统室内场景下256QAM性能研究

doi:10.11959/j.issn.1000-0801.2016004

摘要/Abstract

摘要：

为解决室内及热点地区流量激增的问题，3GPP 标准组织在Release12（R12）中提出了LTE-Hi，由于其覆盖场景的特殊性可以考虑引入256QAM调制提升系统性能。根据标准给出的256QAM编码表，推导了一种基于判决边界的软解调算法。通过仿真LTE-Hi场景下终端SINR的分布说明256QAM的可行性，并根据针对256QAM 调制而改变的CQI/MCS/TBS 信令配置链路仿真，得到不同EVM 下256QAM 相较于64QAM 的吞吐量。最后，比较了LTE-Hi在不同室内场景中引入256QAM之后系统的性能。

关键词: LTE-Hi, 256QAM, EVM, 性能增益

Abstract:

In order to solve the traffic explosion of indoor and hotspots,LTE-Hi was put forward by 3GPP organization in Release12.Due to the coverage particularity of indoor and hotspots scenarios,the organization introduced 256QAM to improve system performance.According to the 256QAM constellation given in the standard,a soft demodulation algorithm based on border distance decision was deduced.Through a simulation of the UE SINR distribution in the LTE-Hi scenario,the feasibility of the 256QAM was proved and according to the CQI/MCS/TBS signaling table changed for 256QAM,link level simulation showed the 256QAM and 64QAM throughput in comparison under different EVM index.Finally,the system performance with and without the introduction of 256QAM under different scenarios was evaluated.

Key words: LTE-Hi, 256QAM, EVM, performance gain

刘珊,陶成,刘留. LTE-Hi系统室内场景下256QAM性能研究[J]. 电信科学, 2016, 32(1): 25-33.

Shan LIU,Cheng TAO,Liu LIU. Performance of 256QAM in LTE-Hi indoor scenario[J]. Telecommunications Science, 2016, 32(1): 25-33.

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参考文献 16

[1]	Cisco.Cisco visual networking index:global mobile data traffic forecast update,2009-2014（White Paper）[R/OL].[2015-02-03]. .
[2]	CHEN S , WANG Y , QIN F , et al. LTE-Hi:a new solution to future wireless mobile broadband challenges and requirements[J]. IEEE Wireless Communications, 2014,21（3）:70-78.
[3]	焦慧颖 . 未来室内热点增强技术的研究[J]. 电信网技术， 2012,38（8）:34-38. JIAO H Y . Study on enhanced indoor hotpot in future[J]. Telecommunications Network Technology, 2012,38（8）:34-38.
[4]	Physical channels and modulation（Release 9）:3GPP.TS36.211:2010[S/OL].[2010-12-16]. .
[5]	Multiplexing and channel coding（Release 9）:3GPP.TS36.212:2010[S/OL].[2010-12-05]. .
[6]	何立峰，刘建军，沈晓冬 . 256QAM在LTE-Advanced标准中的应用[J]. 现代电信科技， 2012,42（12）:47-52. HE L F , LIU J J , SHEN X D . The application of 256QAM in LTE-Advanced[J]. Modern Science & Technology of Telecommunications, 2012,42（12）:47-52.
[7]	Scenarios and requirements for small cell enhancements for E-URTA and E-UTRAN（Release 12）:3GPP.TR 36.932:2013[S/OL].[2013-03-18]. .
[8]	Small cell enhancements for E-UTRA and E-UTRAN —physical layer aspects（Release 12）:3GPP.TR 36.872:2013[S/OL].[2013-09-20]. .
[9]	Physical layer procedures（Release 12）:3GPP.TS36.213:2014[S/OL].[2014-12-17]. .
[10]	汤剑彬，王亚峰 . LTE-Hi高阶星座调制性能研究[J]. 移动通信， 2014,38（16）:44-47. TANG J B , WANG Y F . Research on performance gain of higher order modulation in LTE-Hi[J]. Mobile Communications, 2014,38（16）:44-47.
[11]	张长青 . TD-LTE QAM仿真和误码率性能研究[J]. 移动通信， 2013,37（24）:26-30. ZHANG C Q . Research on simulations of TD-LTE QAM and BER performance[J]. Mobile Communications, 2013,37（24）:26-30.
[12]	罗祖栋，祁万军 . LTE中16QAM解调算法的研究[EB/OL].[2011-03-17]. . LUO Z D , QI W J . Study on demodulating algorithms for 16QAM in LTE.system[EB/OL].[2011-03-17]. .
[13]	陈宇，魏克军 . 面向室内热点的高阶调制技术研究[J]. 电信网技术， 2013,39（7）:49-52. CHEN Y , WEI K J . Research on higher order modulation based on indoor and hotspot scenario[J]. Telecommunications Network Technology, 2013,39（7）:49-52.
[14]	Further advancements for E-UTRA physical layer aspects:3GPP.TR 36.814:2010[S/OL].[2010-03-30]. .
[15]	IWAMOTO M , MATSUOKA S , IWASAKI H . Transmission performance of OFDM with 1024-QAM in the presence of EVM degradation[C]// Proceedings of IEEE Asia Pacific Conference on Wireless and Mobile, August 28-30,2014. New Jersey. IEEE Press, 2014: 12-16.
[16]	CQI/MCS table design for 256QAM:R1-140034:2014[S/OL].[2014-02-01]. .

传输块大小（TBS）	编码效率（CR）	频谱效率（SE）	传输块大小（TBS）	编码效率（CR）	频谱效率（SE）
2 472	0.515 0	4.12	3 624	0.755 0	6.04
2 600	0.550 0	4.33	3 752	0.781 7	6.25
2 856	0.595 0	4.76	3 880	0.808 3	6.47
2 984	0.621 7	4.97	3 944	0.821 7	6.57
3 112	0.648 3	5.19	4 072	0.848 3	6.79
3 240	0.675 0	5.40	4 200	0.875 0	7.00
3 368	0.701 7	5.61	4 392	0.915 0	7.32
3 496	0.728 3	5.83	4 520	0.941 7	7.53

CQI	调制方式	CR×1 024	SE
12	256QAM	711	5.554 7
13	256QAM	797	6.226 6
14	256QAM	885	6.914 1
15	256QAM	948	7.406 3

I_TBS			N_PRB
I_TBS	1	2	3	4	5
27	648	1 320	1 992	2 664	3 368
28	680	1 384	2 088	2 792	3 496
29	712	1 480	2 216	2 984	3 752
30	776	1 544	2 344	3 112	3 880
31	808	1 608	2 472	3 240	4 136
32	840	1 672	2 536	3 368	4 264
33	968	1 992	2 984	4 008	4 968

参数	设定值
载波频率/GHz	3.5
带宽/MHz	10
信道模型	EPA
传输模式	STBC
MIMO	2×2
循环前缀	正常
UE	MMSE
信道估计	理想
RB数目	5
负载	3个PDCCH符号，2端口的CRS
评估指标	吞吐量

	EVM		吞吐量增益
发送端		接收端	SNR=25 dB	SNR=35 dB
0		0	13.4%	28.6%
4%		0	3.4%	17.2%
4%		4%	-1.5%	14.2%