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空间光通信中光MIMO系统性能仿真 被引量:1
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作者 唐雁峰 李锐 +1 位作者 夏丹 王征 《长春理工大学学报(自然科学版)》 2014年第4期52-55,共4页
针对空间激光通信受大气信道湍流、闪烁等现象的影响而导致通信性能下降等问题,提出了一种光学多输入多输出(MIMO)技术,并建立了相应的仿真模型。首先通过分析选择最优的分集方式,并利用建立的仿真模型进行了不同数量发射光束对光强起... 针对空间激光通信受大气信道湍流、闪烁等现象的影响而导致通信性能下降等问题,提出了一种光学多输入多输出(MIMO)技术,并建立了相应的仿真模型。首先通过分析选择最优的分集方式,并利用建立的仿真模型进行了不同数量发射光束对光强起伏的影响仿真,然后对采用相同的MIMO技术不同调制方式的通信系统进行仿真。仿真结果显示,随着发射光束的增加,光强起伏方差远小于单路发射,PPM调制方式性能优于OOK调制方式,结果表明MIMO系统性能相对单发单收系统有明显的改善,充分体现出MIMO系统的优越性。 展开更多
关键词 空间通信 光mimo系统 大气湍流 模型仿真
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基于光MIMO传输系统的项目式案例教学
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作者 黄宇翔 陈晓 《中文科技期刊数据库(全文版)教育科学》 2022年第11期117-120,共4页
针对传统电子电路及相关课程普遍存在的理论与实践脱节、学生缺乏自主学习能力问题,本文以通信电子电路课程为例,结合基础理论教学,选取光MIMO通信实验,融入工程实践能力训练,设计了基于学习小组的项目式案例。该案例引导了学生综合运... 针对传统电子电路及相关课程普遍存在的理论与实践脱节、学生缺乏自主学习能力问题,本文以通信电子电路课程为例,结合基础理论教学,选取光MIMO通信实验,融入工程实践能力训练,设计了基于学习小组的项目式案例。该案例引导了学生综合运用通信电子电路等知识解决实际工程问题,并进行相关测试与结果分析。案例实施结果表明,提出教学案例具有工程性强、创新性好的特点,促进了学生以小组为单位进行自主式学习,对新工科背景下电子电路理论课程教学与实践结合具有重要参考意义。 展开更多
关键词 光mimo 项目式 案例教学
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基于DCO-OFDM的水下蓝绿光成像MIMO系统功率优化 被引量:1
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作者 赵冉 符杰林 +1 位作者 李燕龙 林基明 《光通信技术》 北大核心 2019年第10期41-46,共6页
针对水下蓝绿光成像多输入多输出(MIMO)系统成像接收存在信号干扰的问题,提出一种优化各发射端直流偏置的功率分配方法。该方法以加直流偏置的光正交频分复用(DCO-OFDM)成像MIMO系统误码率最小为目标,在总功率一定的条件下,利用信道矩... 针对水下蓝绿光成像多输入多输出(MIMO)系统成像接收存在信号干扰的问题,提出一种优化各发射端直流偏置的功率分配方法。该方法以加直流偏置的光正交频分复用(DCO-OFDM)成像MIMO系统误码率最小为目标,在总功率一定的条件下,利用信道矩阵奇异值分解求得发射端最优功率分配矩阵,并在保证信号非负的基础上,根据最优功率分配矩阵求解各发射端所需添加的直流偏置量。仿真结果表明:与未进行功率优化的成像MIMO-DCO-OFDM系统相比,该方法可进一步降低水下蓝绿光成像MIMO系统的误码率。 展开更多
关键词 水下蓝绿成像mimo 功率优化 直流偏置 误码率
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复用技术在空间光通信中的应用研究 被引量:1
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作者 王翔 赵尚弘 +2 位作者 李勇军 朱子行 赵顾颢 《半导体光电》 CAS CSCD 北大核心 2011年第3期392-397,共6页
复用技术能够利用现有的硬件设备和成熟技术,成倍地提高系统容量,已经成为高速空间光通信的重要技术手段。文章从提高信息传输速率的角度出发,研究了偏振复用、波分复用、时分复用、光MIMO以及正交频分复用五种复用技术在空间光通信应... 复用技术能够利用现有的硬件设备和成熟技术,成倍地提高系统容量,已经成为高速空间光通信的重要技术手段。文章从提高信息传输速率的角度出发,研究了偏振复用、波分复用、时分复用、光MIMO以及正交频分复用五种复用技术在空间光通信应用的基本原理,并介绍了最新研究动态。对比分析了空间光通信中五种复用技术的优缺点,结果表明正交频分复用和光MIMO技术是实现空间光通信海量信息传输的有效途径之一,具有很大的发展潜力。 展开更多
关键词 偏振复用 波分复用 时分复用 光mimo 正交频分复用
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Spectral Efficiency and Power Allocation for Mixed-ADC Massive MIMO System 被引量:7
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作者 Mengjiao Zhang Weiqiang Tan +1 位作者 Junhui Gao Shi Jin 《China Communications》 SCIE CSCD 2018年第3期112-127,共16页
This paper investigates the achievable uplink spectral efficiency(SE) of a massive multi-input multi-output(MIMO) system with a mixed analog-to-digital converter(ADC) receiver architecture, in which some antennas are ... This paper investigates the achievable uplink spectral efficiency(SE) of a massive multi-input multi-output(MIMO) system with a mixed analog-to-digital converter(ADC) receiver architecture, in which some antennas are equipped with full-resolution ADCs while others are deployed with low-resolution ADCs. We derive the theoretical results and corresponding approximate expressions of the achievable SE in multi-cell systems with maximum ratio combining(MRC) detector and in single-cell systems with zero-forcing(ZF) detector. Based on approximated results, the effects of physical parameters, including the transmit power, the number of antennas, the proportion of full-resolution ADCs and the quantization precision of the low-resolution ADCs on the achievable SE are revealed. Furthermore, we propose the power allocation algorithms based on the lower bound and upper bound of approximate achievable SE. Our results show that the total achievable SE improves by increasing the number of BS antennas, the signal-to-noise ratio(SNR), and the quantization precision. Results showcase that proposed power allocation algorithms remarkably improve the total achievable SE comparing to the equal power allocation algorithm, which verifies the effectiveness of our proposed schemes. 展开更多
关键词 massive mimo mixed-ADC ar-chitecture MRC detector ZF detector spec-tral efficiency power allocation scheme.
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Physical-Layer Encryption in Massive MIMO Systems with Spatial Modulation 被引量:1
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作者 Sixin Wang Wei Li Jing Lei 《China Communications》 SCIE CSCD 2018年第10期159-171,共13页
Massive multiple input and multiple output(MIMO) is a key technology of the fifth generation(5 G) wireless communication systems, which brings various advantages, such as high spectral efficiency and energy efficiency... Massive multiple input and multiple output(MIMO) is a key technology of the fifth generation(5 G) wireless communication systems, which brings various advantages, such as high spectral efficiency and energy efficiency. In MIMO system, spatial modulation(SM) has recently emerged as a new transmission method. In this paper, in order to improve the security in SM-MIMO, a physical layer encryption approach named chaotic antenna-index three-dimensional modulation and constellation points rotated(CATMCPR) encryption scheme is proposed, which utilizes the chaotic theory and spatial modulation techniques. The conventional physical-layer encryption in SM-MIMO suffers from spectral efficiency(SE) performance degradation and usually needs a preshared key, prior channel state information(CSI) or excess jamming power. By contrast, we show that the CATMCPR scheme can not only achieve securely communication but also improve above drawbacks. We evaluate the performances of the proposed scheme by an analysis and computer simulations. 展开更多
关键词 massive mimo chaotic system physical layer security antenna-index spatial modulation
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Spectral and Energy Efficiency of Downlink MU-MIMO Systems with MRT 被引量:4
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作者 Weiqiang Tan Shi Jin Jide Yuan 《China Communications》 SCIE CSCD 2017年第5期105-111,共7页
This paper studies the achievable spectral efficiency(SE)of downlink multiuser multiple-input-multiple-output(MIMO)system,where the base station(BS)is deployed an arbitrary finite antenna number and communicates simul... This paper studies the achievable spectral efficiency(SE)of downlink multiuser multiple-input-multiple-output(MIMO)system,where the base station(BS)is deployed an arbitrary finite antenna number and communicates simultaneously with many users. We assume that the BS has accurate channel state information(CSI)and adopt maximum ratio transmission(MRT)precoding. An accurate analytical result for the achievable SE is obtained. Based on the analytical result on the achievable SE,we further study the achievable energy efficiency(EE)of multiuser MIMO system by considering an energy consumption model. Results indicate that the increasing number of BS antennas can boost the achievable SE of system,whilst the achievable SE tends to a saturated rate in the high signal-tonoise ratios(SNR)regime. Furthermore,an important conclusion is that the increasing number of users is beneficial for the achievable EE and there is an optimal antenna number to maximize the EE of system. 展开更多
关键词 energy efficiency multiuser mimo maximum ration transmission spectral efficiency
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