相关信道下基于多用户VBLAST-OFDM的资源分配算法研究
发布时间：2018-07-25 13:59
【摘要】：作为下一代无线通信中的关键技术垂直贝尔实验室分层空时正交频分复用(Vertical Bell Laboratories Layered Space Time-Orthogonal Frequency Division Multiplexing,VBLAST-OFDM)能够极大地提高频谱利用率。通过与自适应技术的融合处理,可根据不同用户的服务质量(Quality of Service,Qo S)要求和子载波的信道状态信息(Channel State Information,CSI),动态地分配子载波和数据比特,能达到进一步提高频谱利用率的目的。本文从实际通信环境出发,对多用户VBLAST-OFDM资源分配算法进行理论上和技术上的研究。单独针对物理层的传输策略,以系统吞吐量最大化为优化目标,在相关瑞利衰落信道下给出了一种基于部分CSI的自适应子载波分配算法。算法通过Kronecker内积描述信道相关的特性,引用均值反馈模型模拟CSI的反馈机制,从而获得了相应的数学物理模型,并得出了对应的自适应子载波分配方法。实验结果表明,该算法不仅能有效地反映天线相关矩阵中相关系数以及延时反馈参数对系统吞吐量的影响,且与未利用均值反馈模型的子载波分配相比具有明显的优越性。基于跨层的传输策略,以系统最大吞吐量为目标,通过充分考虑应用层不同业务的服务质量要求和数据链路层的动态特性,在相关信道下给出基于部分CSI的跨层资源分配算法。该算法的目标函数包括子载波占用情况,功率限制,传输速率,不同业务的服务质量需求及数据链路层的队列状态信息等约束参数,在基站端数据链路层存在有限缓存条件下,根据Kronecker内积表示相关信道模型,通过均值反馈模型描述物理层信息的传递过程,并利用服务质量性能指标表示不同业务的需求,进而推导出相应的跨层资源分配原则。实验结果表明:该算法不仅考虑了反馈延时对系统吞吐量的影响,同时在考虑数据链路层的动态特性和不同业务需求情况下,与现有算法比较,不仅可满足不同业务用户的Qo S需求,而且可获得高的吞吐量和较低的丢包率。
[Abstract]:As a key technology in the next generation wireless communication, vertical Bell Labs layered Space-Time orthogonal Frequency Division Multiplexing (Vertical Bell Laboratories Layered Space Time-Orthogonal Frequency Division) Multiplexing VBLAST-OFDM (orthogonal Frequency Division Multiplexing) can greatly improve the spectral efficiency. By combining with adaptive technology, the subcarriers and data bits can be dynamically allocated according to the quality of service (Quality of Service QoS) requirements of different users and the channel state information (Channel State) of the subcarriers, which can further improve the spectral efficiency. In this paper, the multi-user VBLAST-OFDM resource allocation algorithm is studied theoretically and technically based on the actual communication environment. An adaptive subcarrier allocation algorithm based on partial CSI in correlated Rayleigh fading channel is proposed for the physical layer transmission strategy and the optimal target is to maximize the system throughput. The algorithm uses Kronecker inner product to describe the characteristics of channel correlation and uses the mean feedback model to simulate the feedback mechanism of CSI. Thus the corresponding mathematical and physical model is obtained and the corresponding adaptive subcarrier allocation method is obtained. Experimental results show that the proposed algorithm can not only effectively reflect the influence of correlation coefficient and delay feedback parameters in antenna correlation matrix on system throughput, but also has obvious advantages over subcarrier allocation without mean feedback model. Based on the cross-layer transmission strategy, aiming at the maximum throughput of the system, a cross-layer resource allocation algorithm based on partial CSI is proposed under the correlation channel by fully considering the QoS requirements of different services in the application layer and the dynamic characteristics of the data link layer. The objective functions of the algorithm include subcarrier occupancy, power limitation, transmission rate, QoS requirements of different services and queue state information of the data link layer. According to the Kronecker inner product representation correlation channel model, the mean feedback model is used to describe the transfer process of physical layer information, and the quality of service performance index is used to represent the requirements of different services, and the corresponding cross-layer resource allocation principle is deduced. Experimental results show that the proposed algorithm not only considers the effect of feedback delay on system throughput, but also takes into account the dynamic characteristics of data link layer and different traffic requirements. It can not only satisfy the QoS requirements of different service users, but also achieve high throughput and low packet loss rate.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.53
[Abstract]:As a key technology in the next generation wireless communication, vertical Bell Labs layered Space-Time orthogonal Frequency Division Multiplexing (Vertical Bell Laboratories Layered Space Time-Orthogonal Frequency Division) Multiplexing VBLAST-OFDM (orthogonal Frequency Division Multiplexing) can greatly improve the spectral efficiency. By combining with adaptive technology, the subcarriers and data bits can be dynamically allocated according to the quality of service (Quality of Service QoS) requirements of different users and the channel state information (Channel State) of the subcarriers, which can further improve the spectral efficiency. In this paper, the multi-user VBLAST-OFDM resource allocation algorithm is studied theoretically and technically based on the actual communication environment. An adaptive subcarrier allocation algorithm based on partial CSI in correlated Rayleigh fading channel is proposed for the physical layer transmission strategy and the optimal target is to maximize the system throughput. The algorithm uses Kronecker inner product to describe the characteristics of channel correlation and uses the mean feedback model to simulate the feedback mechanism of CSI. Thus the corresponding mathematical and physical model is obtained and the corresponding adaptive subcarrier allocation method is obtained. Experimental results show that the proposed algorithm can not only effectively reflect the influence of correlation coefficient and delay feedback parameters in antenna correlation matrix on system throughput, but also has obvious advantages over subcarrier allocation without mean feedback model. Based on the cross-layer transmission strategy, aiming at the maximum throughput of the system, a cross-layer resource allocation algorithm based on partial CSI is proposed under the correlation channel by fully considering the QoS requirements of different services in the application layer and the dynamic characteristics of the data link layer. The objective functions of the algorithm include subcarrier occupancy, power limitation, transmission rate, QoS requirements of different services and queue state information of the data link layer. According to the Kronecker inner product representation correlation channel model, the mean feedback model is used to describe the transfer process of physical layer information, and the quality of service performance index is used to represent the requirements of different services, and the corresponding cross-layer resource allocation principle is deduced. Experimental results show that the proposed algorithm not only considers the effect of feedback delay on system throughput, but also takes into account the dynamic characteristics of data link layer and different traffic requirements. It can not only satisfy the QoS requirements of different service users, but also achieve high throughput and low packet loss rate.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.53
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