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基于LTE-A的仿真平台搭建及MIMO关键算法研究与验证

发布时间:2019-06-20 23:20
【摘要】:LTE-A(Long Term Evolution-Advanced)作为第四代移动通信技术,在上下行传输速率、通信质量等方面相比3G系统取得了很大提升。作为目前全面推广的通信技术,在高吞吐量和可靠通信传输的双向要求下,从空间领域挖掘更多可用传输资源以及从有效的信道反馈角度提供更稳定通信质量等方向成为LTE-A重点技术。多用户多输入多输出(Multiple Users-Multiple Input Multiple Output,MUMIMO)、链路自适应、混合自动请求重传(Hybird Automatic Repeat reQuest,HARQ)等在LTE-A协议中提供重要技术支持。基于预编码的MU-MIMO技术跟传统点对点MIMO技术相比能提供多用户配对增益、解决收发天线数差异较大及天线相关性问题、较传统MIMO技术能提供更高系统容量;链路自适应技术可根据下行信道瞬息变化调整系统的编码和调制方式以达到最优吞吐量;混合自动请求重传HARQ结合前向纠错编码技术和自动请求重传技术,在一定纠错能力基础上重传软合并数据,提供了更快速可靠的传输。本论文基于LTE-A编码调制等不同协议搭建下行物理共享信道传输平台,实现MU-MIMO、链路自适应、HARQ等技术。完成了基于时分、频分双工模式下的几种关键MU-MIMO预编码算法的仿真验证工作,包括TDD模式下基于奇异值分解的预编码技术和多用户块对角化预编码技术;FDD模式下基于RANK-2反馈的MU-MIMO预编码技术和基于迫零波束成形的RANK-1 MU-MIMO预编码技术。在这些算法上加载了链路自适应技术以及HARQ技术,同时仿真验证了各种MU-MIMO算法在加载链路自适应和HARQ后的性能和吞吐量的增益。本文同时在基于信干噪比(Signal-to-Interference plus Noise Ratio,SINR)的双流MU-MIMO调度算法上的不足,提出了基于修正SINR的MU-MIMO调度方案以增加MU-MIMO系统在SNR较高时的吞吐量。最后本文提出在MU-MIMO基础上引入设备到设备(Device to Device,D2D)终端交互的联合检测接收后,可并发超过两流的多流MU-MIMO通信,进一步提升了MU-MIMO系统的吞吐量。
[Abstract]:As the fourth generation mobile communication technology, LTE-A (Long Term Evolution-Advanced) has made great progress compared with 3G system in terms of uplink transmission rate and communication quality. As a comprehensive communication technology, under the two-way requirements of high throughput and reliable communication transmission, mining more available transmission resources from the space field and providing more stable communication quality from the point of view of effective channel feedback has become the key technology of LTE-A. Multi-user multi-input multiple-output (Multiple Users-Multiple Input Multiple Output,MUMIMO), link adaptation, hybrid automatic request retransmission (Hybird Automatic Repeat reQuest,HARQ) provide important technical support in LTE-A protocol. Compared with the traditional point-to-point MIMO technology, the MU-MIMO technology based on precoding can provide multiuser pairing gain, solve the problem of large difference in the number of antennas and antenna correlation, and provide higher system capacity than the traditional MIMO technology, and the link adaptive technology can adjust the coding and modulation mode of the system according to the transient change of downlink channel to achieve the optimal throughput. Hybrid automatic request retransmission HARQ combines forward error correction coding technology and automatic request retransmission technology to retransmit soft merged data on the basis of certain error correction ability, which provides faster and more reliable transmission. In this paper, a downlink physical shared channel transmission platform is built based on different protocols such as LTE-A coding and modulation, and MU-MIMO, link adaptation, HARQ and other technologies are realized. The simulation and verification of several key MU-MIMO precoding algorithms based on time division and frequency division duplex mode are completed, including singular value decomposition based precoding technology and multi-user block diagonal precoding technology in TDD mode, MU-MIMO precoding technology based on RANK-2 feedback in FDD mode and RANK-1 MU-MIMO precoding technology based on zero forcing beamforming. The link adaptation technology and HARQ technology are loaded on these algorithms, and the performance and throughput gains of various MU-MIMO algorithms after loading link adaptation and HARQ are verified by simulation. At the same time, in view of the shortcomings of the dual-stream MU-MIMO scheduling algorithm based on signal-to-noise ratio (Signal-to-Interference plus Noise Ratio,SINR), a MU-MIMO scheduling scheme based on modified SINR is proposed to increase the throughput of MU-MIMO systems when SNR is high. Finally, this paper proposes to introduce the joint detection and reception of device-to-device (Device to Device,D2D) terminal interaction on the basis of MU-MIMO, which can parallel more than two streams of multi-stream MU-MIMO communication, which further improves the throughput of MU-MIMO system.
【学位授予单位】:电子科技大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TN929.53;TN919.3

【参考文献】

相关期刊论文 前1条

1 王彬;陈力;张欣;杨大成;;在LTE-Advanced网络下的Device-to-Device通信[J];现代电信科技;2010年07期



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