A Novel Method for Pilot Pattern Selection in 5G NR Systems
A Novel Method for Pilot Pattern Selection in 5G NR Systems
复制标题
5G NR 系统中导频模式选择的新方法
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
A. Sethi
中科院分区：
文献类型：
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作者：
Ramesh Chandran;A. Sethi
5G新无线电（NR）是由第三代合作伙伴计划（3GPP）开发的新的无线接入技术，以满足各种用例的不同性能要求。此外，5G NR系统将为高移动性场景中的大量连接设备提供无缝的端到端连接。5G NR系统旨在支持更大的带宽，以满足高数据速率的要求。由于系统配置的多样性和较高操作频率下的不同信道条件，估计所配置的带宽部分（BWP）上的信道响应的解决方案是一项具有挑战性的任务。文献中讨论的信道估计技术没有深入分析5G NR导频图案的性能和选择。本文重点研究了基于5G NR解调参考信号（DMRS）的导频图案的设计，通过考虑不同的信道模型来最大化信道容量。针对更高码率传输，已经评估了调制和编码方案（MCS）适配的使用的选择相对于附加参考符号传输。提出了面向5G NR标准的框架，以根据目标误块率（BLER）和反馈响应动态调整DMRS模式。在设计导频图案时考虑信道估计精度和DMRS开销之间的权衡。从仿真结果中可以看出，与传统的方案相比，在特定的业务和信道条件下，所提出的方案在吞吐量上获得了显着的增益。
5G New Radio (NR) is a new wireless access technology which is developed by the 3rd Generation Partnership Project (3GPP) to meet the diverse performance requirements by various use cases. In addition, 5G NR system is set to provide seamless end-to-end connectivity for the large amount of connected devices in high mobility scenarios. 5G NR system is designed to support larger bandwidth in order to meet the high data rate requirements. A solution to estimate the channel response across the configured Bandwidth Part (BWP) is a challenging task due to variety of system configurations and diverse channel conditions at higher frequency of operation. The channel estimation techniques discussed in the literatures have not deeply analysed the performance and selection of 5G NR pilot patterns. This paper focuses on design of 5G NR Demodulation Reference Signal (DMRS) based pilot pattern for maximising the channel capacity by considering different channel models. Choice of usage of Modulation and Coding Scheme (MCS) adaptation against additional reference symbol transmission has been evaluated for a higher code rate transmission. 5G NR standard oriented framework is proposed to dynamically adjust the DMRS pattern as per target Block Error Rate (BLER) and feedback response. Trade-off between channel estimation accuracy and DMRS overhead is considered while designing the pilot pattern. It is observed from simulation results that, significant gain in throughput is achieved by the proposed scheme under specific traffic and channel conditions as compared to conventional schemes.