"Network MIMO" is implemented to eliminate intercell interference and improve spectral efficiency.Several system models are introduced here and synchronous and asynchronous interference are considered.This p..."Network MIMO" is implemented to eliminate intercell interference and improve spectral efficiency.Several system models are introduced here and synchronous and asynchronous interference are considered.This paper also has a look on the algorithms on the uplink decoding and downlink precoding in network MIMO with base station coordination.Two levels of base station coordination and cellular backhaul are presented,too.展开更多
Multi-cell multi-user multiple-input multiple-output （MC-MU-MIMO） is a promising technique to eliminate inter-user interference and inter-cell cochannel interference in wireless telecommunication systems. As the lar...Multi-cell multi-user multiple-input multiple-output （MC-MU-MIMO） is a promising technique to eliminate inter-user interference and inter-cell cochannel interference in wireless telecommunication systems. As the large number of users in the system and the limited number of simultaneously supportable users with MC-MU-MIMO, it is necessary to select a subset of users to maximize the total throughput. However, the fully centralized user selection algorithms used in single cell system, which will incur high complexity and backhaul load in multi-cell cooperative processing （MCP） systems, are not suitable to MC-MU-MIMO systems. This article presents a two cascaded user selection method for MCP systems with multi-cell block diagonalization. In this paper, a local optimal subset of users, which can maximize the local sum capacity, is first chosen by the greedy method in every cooperative base station in parallel. Then, all the cooperative base stations report their local optimal users to the central unit （CU）. Finally, the global optimal users, which can maximize the global sum capacity of MCP systems, are selected from the aggregated local optimal users at the CU. The simulation results show that the proposed method performs closely to the optimal and centralized algorithm. Meanwhile, the complexity and backhaul load are reduced dramatically.展开更多
为解决基于协作多输入多输出(Multi-input multi-output,MIMO)的同构无线传感器网络(Wireless sensor net-works,WSN)能量节省与能耗均衡问题,建立了多跳分布式WSN系统模型.对协作MIMO通信中的簇间长传输距离与簇内短传输距离进行了分析...为解决基于协作多输入多输出(Multi-input multi-output,MIMO)的同构无线传感器网络(Wireless sensor net-works,WSN)能量节省与能耗均衡问题,建立了多跳分布式WSN系统模型.对协作MIMO通信中的簇间长传输距离与簇内短传输距离进行了分析,找到与传统单输入单输出(Single-input single-output,SISO)传输相比更节省能量的距离门限.根据分析提出了一种新的基于剩余能量与距离门限的动态分簇(Dynamic clustering based on remaining energy and distance thres holds,DCREDT)选择算法,在节省能量的前提下,使剩余能量较大的节点优先成为簇首,实现了簇首与其他节点之间的能耗均衡.最后分析了采用DCREDT选择算法进行多跳传输的总能耗,并仿真验证了该算法的合理性与有效性.展开更多
不同基站和用户间由于距离变化等使传播时延不同而造成小区间的迟延干扰,严重恶化了系统性能。为此,探讨了如何利用SLNR(Signal to Leakage Noise Ratio)预编码抑制小区间的迟延干扰,给出了小区协作的系统模型及小区间迟延干扰分析。针...不同基站和用户间由于距离变化等使传播时延不同而造成小区间的迟延干扰,严重恶化了系统性能。为此,探讨了如何利用SLNR(Signal to Leakage Noise Ratio)预编码抑制小区间的迟延干扰,给出了小区协作的系统模型及小区间迟延干扰分析。针对存在迟延的LTE(Long Term Evolution)系统设计了一种基于SLNR准则的迟延SLNR预编码,以抑制小区间的迟延干扰,降低接收终端的复杂度。同时,对迟延SLNR预编码在LTE系统多基站协作环境下的性能进行了仿真。仿真结果表明,该方法对小区间的迟延干扰有较好的抑制作用,对不同天线配置性能均较理想,与接收端处理方案比较性能有所改进。虽然信道估计误差对性能有一定影响,但在可接受范围。展开更多
基站协作系统中,基于正则化迫零波束赋形(regularized zero forcing beam-forming,RZFBF)的集中式协作预编码能够获得与脏纸编码近似的容量性能,然而随协作基站数目增多,集中式协作预编码对回程容量的要求变得极高.针对该问题,提出了基...基站协作系统中,基于正则化迫零波束赋形(regularized zero forcing beam-forming,RZFBF)的集中式协作预编码能够获得与脏纸编码近似的容量性能,然而随协作基站数目增多,集中式协作预编码对回程容量的要求变得极高.针对该问题,提出了基于广义近似消息传递(generalized approximate message passing,GAMP)的分布式预编码符号设计方案,通过相邻基站间的信息交互将全局计算开销分解成许多小的计算任务,极大地降低了系统对回程容量的要求.仿真结果表明,所提算法能够以较低的计算复杂度获得近似于集中式RZFBF预编码算法所能达到的系统吞吐量.展开更多
A dual-polarized multiple-input multiple-output(MIMO)antenna is proposed for 5G base stations.Each antenna element consists of two orthogonally placed fan-shaped dipole elements and45°dual-polarized feed-ing str...A dual-polarized multiple-input multiple-output(MIMO)antenna is proposed for 5G base stations.Each antenna element consists of two orthogonally placed fan-shaped dipole elements and45°dual-polarized feed-ing structures are used to achieve broadband operation.The resonant frequency of the array element is from 3.3 to 4.2 GHz,which covers the mainstream spectrum allocations of 5G mobile networks.H-shaped coupling elements are used to improve the isolation between the neighboring antenna elements and the mutual coupling is reduced by over 4 dB.The envelope correlation of a 2×2 array is provided for verification.展开更多
文摘"Network MIMO" is implemented to eliminate intercell interference and improve spectral efficiency.Several system models are introduced here and synchronous and asynchronous interference are considered.This paper also has a look on the algorithms on the uplink decoding and downlink precoding in network MIMO with base station coordination.Two levels of base station coordination and cellular backhaul are presented,too.
文摘Multi-cell multi-user multiple-input multiple-output （MC-MU-MIMO） is a promising technique to eliminate inter-user interference and inter-cell cochannel interference in wireless telecommunication systems. As the large number of users in the system and the limited number of simultaneously supportable users with MC-MU-MIMO, it is necessary to select a subset of users to maximize the total throughput. However, the fully centralized user selection algorithms used in single cell system, which will incur high complexity and backhaul load in multi-cell cooperative processing （MCP） systems, are not suitable to MC-MU-MIMO systems. This article presents a two cascaded user selection method for MCP systems with multi-cell block diagonalization. In this paper, a local optimal subset of users, which can maximize the local sum capacity, is first chosen by the greedy method in every cooperative base station in parallel. Then, all the cooperative base stations report their local optimal users to the central unit （CU）. Finally, the global optimal users, which can maximize the global sum capacity of MCP systems, are selected from the aggregated local optimal users at the CU. The simulation results show that the proposed method performs closely to the optimal and centralized algorithm. Meanwhile, the complexity and backhaul load are reduced dramatically.
文摘为解决基于协作多输入多输出(Multi-input multi-output,MIMO)的同构无线传感器网络(Wireless sensor net-works,WSN)能量节省与能耗均衡问题,建立了多跳分布式WSN系统模型.对协作MIMO通信中的簇间长传输距离与簇内短传输距离进行了分析,找到与传统单输入单输出(Single-input single-output,SISO)传输相比更节省能量的距离门限.根据分析提出了一种新的基于剩余能量与距离门限的动态分簇(Dynamic clustering based on remaining energy and distance thres holds,DCREDT)选择算法,在节省能量的前提下,使剩余能量较大的节点优先成为簇首,实现了簇首与其他节点之间的能耗均衡.最后分析了采用DCREDT选择算法进行多跳传输的总能耗,并仿真验证了该算法的合理性与有效性.
文摘不同基站和用户间由于距离变化等使传播时延不同而造成小区间的迟延干扰,严重恶化了系统性能。为此,探讨了如何利用SLNR(Signal to Leakage Noise Ratio)预编码抑制小区间的迟延干扰,给出了小区协作的系统模型及小区间迟延干扰分析。针对存在迟延的LTE(Long Term Evolution)系统设计了一种基于SLNR准则的迟延SLNR预编码,以抑制小区间的迟延干扰,降低接收终端的复杂度。同时,对迟延SLNR预编码在LTE系统多基站协作环境下的性能进行了仿真。仿真结果表明,该方法对小区间的迟延干扰有较好的抑制作用,对不同天线配置性能均较理想,与接收端处理方案比较性能有所改进。虽然信道估计误差对性能有一定影响,但在可接受范围。
文摘A dual-polarized multiple-input multiple-output(MIMO)antenna is proposed for 5G base stations.Each antenna element consists of two orthogonally placed fan-shaped dipole elements and45°dual-polarized feed-ing structures are used to achieve broadband operation.The resonant frequency of the array element is from 3.3 to 4.2 GHz,which covers the mainstream spectrum allocations of 5G mobile networks.H-shaped coupling elements are used to improve the isolation between the neighboring antenna elements and the mutual coupling is reduced by over 4 dB.The envelope correlation of a 2×2 array is provided for verification.
