LTE-Hi系统室内场景下256QAM性能研究

doi:10.11959/j.issn.1000-0801.2016004

Abstract

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

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

Figures/Tables 15

References 16

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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%

Performance of 256QAM in LTE-Hi indoor scenario

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Figures/Tables 15

References 16

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MCS指数I_MCS	调制阶数Q_m	TBS指数I_TBS
20	8	25
21	8	27
22	8	28
23	8	29
24	8	30
25	8	31
26	8	32
27	8	33
28	2	reserved
29	4
30	6
31	8

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