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。
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.
出处
《电信科学》
北大核心
2016年第1期25-33,共9页
Telecommunications Science
基金
中央高校基本科研业务费专项资金资助项目(No.2015JBM011)~~
