Intelligent reflecting surface-assisted cognitive radio-inspired rate-splitting multiple access systems

Intelligent reflecting surface(IRS)has been widely regarded as a promising technology for configuring wireless propagation environments.In this paper,we utilize IRS to assist transmission of a secondary user(SU)in a cognitive radio-inspired rate-splitting multiple access(CR-RSMA)system in which a primary user's(PU's)quality of service(QoS)requirements must be guaranteed.Without introducing intolerable interference to deteriorate the PU's outage performance,the SU conducts rate-splitting to transmit its signal to the base-station through the direct link and IRS reflecting channels.For the IRS-assisted CR-RSMA(IRS-CR-RSMA)scheme,we derive the optimal transmit power allocation,target rate allocation,and successive interference cancellation decoding order to enhance the outage performance of the SU.The closed-form expression for the SU's outage probability achieved by the IRS-CR-RSMA scheme is derived.Various simulation results are presented to clarify the enhanced outage performance achieved by the proposed IRS-CR-RSMA scheme over the CR-RSMA scheme.

国际开发创新网络组织(IRED)情况简介

国际开发创新网络组织(IRED),是一个非官方、非营利性的国际组织,1980年9月建立于日内瓦,由来自世界各国180多个成员构成以发展为目标的国际网络中枢。总部设在日内瓦(秘书长是费尔南德·文森特)。下设5个地区办事处,分布于亚洲、非洲、拉丁美洲。在亚洲设曼谷办事处。

五味保肝丸对非酒精性脂肪性肝病小鼠的干预作用及机制

目的 考察五味保肝丸对非酒精性脂肪性肝病(NAFLD)小鼠的干预作用及机制。方法 采用高脂高糖饲料持续喂养小鼠19周复制NAFLD模型。将造模成功的小鼠分为模型组、阳性对照组(多烯磷脂酰胆碱胶囊,23.30 mg/kg)和五味保肝丸低、中、高剂量组(0.11、0.23、0.45 g/kg),另设不造模的正常组,每组8只。药物组小鼠灌胃相应药物,模型组和正常组小鼠灌胃等体积生理盐水,每天1次,连续4周。末次给药结束后,检测各组小鼠的糖代谢(空腹血糖、空腹胰岛素、胰岛素抵抗指数)、肝功能[肝指数、丙氨酸转氨酶(ALT)、天冬氨酸转氨酶(AST)、肝组织病理评分]、脂代谢[甘油三酯(TG)、总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)]相关指标;观察肝组织病理学形态以及纤维化、脂滴形成和糖原合成情况;检测血清中游离脂肪酸(FFA)和肝组织中炎症因子[肿瘤坏死因子α(TNF-α)、白细胞介素6(IL-6)、IL-1β]水平;检测肝组织中胰岛素受体底物/磷脂酰肌醇3-激酶/蛋白激酶B/糖原合成酶激酶3β(IRS/PI3K/AKT/GSK3β)信号通路相关蛋白表达水平。结果 经高剂量的五味保肝丸干预后,NAFLD小鼠肝指数,血清中ALT、AST、FFA、TC、TG、LDL-C水平,肝组织中TNF-α、IL-6、IL-1β水平,空腹血糖、空腹胰岛素、胰岛素抵抗指数,肝组织病理评分、纤维化染色面积占比、脂滴染色面积占比均显著降低(P<0.05);HDL-C水平、糖原染色面积占比和肝组织中IRS1、PI3K、AKT、GSK3β蛋白磷酸化水平均显著升高(P<0.05);肝细胞坏死和脂肪变性程度均减弱,纤维化病变均减轻。五味保肝丸低、中剂量组小鼠的上述指标均有改善趋势,但部分差异无统计学意义。结论 五味保肝丸可调节NAFLD小鼠肝脏脂代谢、糖代谢紊乱,改善肝损伤,其作用机制可能与激活IRS/PI3K/AKT/GSK3β信号通路有关。

高性能Ir基阳极双催化层阴离子交换膜电解水

设计高性能低Ir阳极催化层对阴离子交换膜电解水(AEMWE)商业化发展至关重要。本研究采用催化剂涂覆基底(CCS)方法,构建基于氧化铱(IrO_(2))和碳载铱(IrC)双催化层的阳极结构,提出了一种新型双Ir催化层并提高了AEMWE性能。研究表明,在IrC-IrO_(2)(先喷涂碳载铱,后喷涂氧化铱)催化层中,IrC高度分散特性有利于提高催化层中Ir的利用率,优化了催化层内电子、氢氧根离子的传输。采用商业Pt/C催化剂作为阴极,IrC-IrO_(2)阳极双催化层组装成碱性膜电极,在1 mol/L KOH电解质条件下,2.0 V时IrC-IrO_(2)电极达到了2.31 A/cm^(2)的高电流密度,而且在低浓度电解质以及纯水中依旧保持较高的性能。本研究为碱性膜电解水技术高效催化层的设计提供了参考。

单层MoS_(2)表面Fe,Ir掺杂对NO吸附与直接解离反应性能提升的理论计算

用密度泛函理论中广义梯度近似下的PW91方法,结合周期性平板模型,研究NO分子在掺杂体系TM-MoS_(2)(TM=Fe,Ir)表面的吸附和解离行为.结果表明:与完整MoS_(2)表面的物理吸附(-0.05 eV)不同,Fe,Ir掺杂MoS_(2)表面NO吸附能分别为-3.30,-3.17 eV,说明掺杂表面对NO表现出优异的吸附性能;差分电荷密度分析表明,NO分子吸附后,N原子与掺杂原子Fe,Ir的中间出现电荷增加,形成共价键,掺杂原子周围电荷减少;态密度计算结果表明,NO在掺杂TM-MoS_(2)(TM=Fe,Ir)表面的吸附主要是N原子的2py,2px与掺杂原子Fe的3d_(xy),3d_(yz),3d_(xz)以及Ir的5d_(xy),5d_(yz),5d_(xz)轨道之间存在较强的相互作用;比较分析解离反应的活化能结果表明,相对贵金属Ir,掺杂廉价的Fe后,NO在Fe-MoS_(2)比在Ir-MoS_(2)表面解离的活化能小,且在Fe-MoS_(2)表面的吸附能与活化能非常接近,仅相差0.08 eV,表明在该体系中NO的吸附与解离存在相互竞争.

基于均匀设计的中药有效单体“IR”方筛选及其对慢性肾衰竭大鼠肾纤维化的作用

目的运用“均匀设计法”从“肾衰Ⅱ号方”中筛选抗肾纤维化中药有效单体组方(淫羊藿苷合迷迭香酸配伍,简称IR方),并进行验证。方法采用5/6(Ablation and infarction,A/I)慢性肾衰大鼠模型,将肾衰Ⅱ号方中已知的5种抗肾纤维化有效单体(淫羊藿苷、迷迭香酸、阿魏酸、苦杏仁苷、大黄素)作为研究对象,按照均匀设计法“5因素8水平”分组,共设8种配比组方。造模后4周,组1~组8给予相应配比的组方药液,假手术组和模型组给予生理盐水,连续干预8周。末次给药后,检测各组大鼠血清肌酐(Serum creatinine,Scr)水平,苏木素-伊红(Hematoxylin-eosin,HE)和马松(Masson)染色观察肾组织病理形态,Western Blot法检测纤维化标志蛋白Ⅰ型胶原(CollagenⅠ,Col-Ⅰ)、纤维连接蛋白(Fibronectin,FN)、结缔组织生长因子(Connective tissue growth factor,CTGF)表达。以各药物组大鼠Scr为筛选指标,通过多元逐步回归分析筛选中药单体成分组方并确定特定配比。再用5/6(A/I)大鼠模型,以氯沙坦钾、母方“肾衰Ⅱ号方”和淫羊藿苷(20 mg·kg^(-1)·d^(-1))作为对照,有效成分组方(淫羊藿苷20 mg·kg^(-1)·d^(-1)+迷迭香酸2.1 mg·kg^(-1)·d^(-1))作为实验药物,连续干预8周。通过各组大鼠Scr、血尿素氮(Blood urea nitrogen,BUN)、病理染色(HE和Masson)和FN、Col-Ⅰ蛋白表达比较各组大鼠肾功能和肾纤维化程度。体外构建转化生长因子-β1(Transforming growth factor-β1,TGF-β1)诱导肾小管细胞(NRK-52E)损伤和肾成纤维细胞(NRK-49F)活化模型,以有效成分组方和相应单一成分作为干预药物,Western Blot法检测FN、Col-Ⅰ、CTGF蛋白表达。结果筛选实验结果提示,组1~组8均可不同程度降低5/6(A/I)大鼠Scr水平,结合病理染色和Western Blot分析,组8效果最优。经过多元逐步回归分析,得到方程为:=88.381-0.539X1-0.473X2+0.01X1X2(X1淫羊藿苷,X2迷迭香酸),提示淫羊藿苷和迷迭香酸配伍为最佳,量比为9.6:1。验证实验结果提示,IR方可以明显改善5/6(A/I)大鼠肾功能,减轻肾小管间质损伤和纤维化,抑制FN和Col-Ⅰ蛋白表达,其表现的肾保护效应与肾衰Ⅱ号方相当,并优于西药对照。体外实验发现,IR方可以明显抑制TGF-β1刺激的NRK-52E细胞和NRK-49F细胞FN、Col-Ⅰ、CTGF蛋白表达,并优于淫羊藿苷或迷迭香酸单独干预。结论基于均匀设计法筛选的有效单体IR方具有改善慢性肾衰大鼠肾功能和抗肾纤维化的效应。

基于综合遥感的察隅县滑坡隐患识别及致灾机理分析

察隅县地处青藏高原东南部,幅原辽阔,地形地貌与气候特征差异较大,滑坡灾害频发。针对该区域开展滑坡灾害隐患识别与早期预警对当地防灾减灾工作有重要意义。为此,收集2020年1月—2022年11月获取的162景升降轨Sentinel-1A雷达遥感影像数据及高分光学遥感影像数据,以Google Earth平台为辅助,采用综合遥感(integrated remote sensing,IRS)技术开展研究区内活动性滑坡隐患识别、编录制图和分析评价,共识别出活动性滑坡隐患237处,主要分布于贡日嘎布曲(察隅河支流西支)、察隅河、怒江两岸及察隅河东部至怒江西部的区域。将解译结果与地形地貌(高程、坡度、岩性)、自然环境(降雨、温度)等定量因子结合进行统计分析可知,左布村滑坡、阿扎村滑坡有极大的灾害风险,推荐进一步采取减灾措施。研究结果具有较高精度,可为当地防灾减灾工作提供参考。

IRS Assisted UAV Communications against Proactive Eavesdropping in Mobile Edge Computing Networks

In this paper,we consider mobile edge computing(MEC)networks against proactive eavesdropping.To maximize the transmission rate,IRS assisted UAV communications are applied.We take the joint design of the trajectory of UAV,the transmitting beamforming of users,and the phase shift matrix of IRS.The original problem is strong non-convex and difficult to solve.We first propose two basic modes of the proactive eavesdropper,and obtain the closed-form solution for the boundary conditions of the two modes.Then we transform the original problem into an equivalent one and propose an alternating optimization(AO)based method to obtain a local optimal solution.The convergence of the algorithm is illustrated by numerical results.Further,we propose a zero forcing(ZF)based method as sub-optimal solution,and the simulation section shows that the proposed two schemes could obtain better performance compared with traditional schemes.

Stabilizing iridium sites via interface and reconstruction regulations for water oxidation in alkaline and acidic media

Exploring effective iridium(Ir)-based electrocatalysts with stable iridium centers is highly desirable for oxygen evolution reaction(OER).Herein,we regulated the incorporation manner of Ir in Co_(3)O_(4)support to stabilize the Ir sites for effective OER.When anchored on the surface of Co_(3)O_(4)in the form of Ir(OH)_6 species,the created Ir-OH-Co interface leads to a limited stability and poor acidic OER due to Ir leaching.When doped into Co_(3)O_(4)lattice,the analyses of X-ray absorption spectroscopy,in-situ Raman,and OER measurements show that the partially replacement of Co in Co_(3)O_(4)by Ir atoms inclines to cause strong electronic effect and activate lattice oxygen in the presence of Ir-O-Co interface,and simultaneously master the reconstruction effect to mitigate Ir dissolution,realizing the improved OER activity and stability in alkaline and acidic environments.As a result,Ir_(lat)@Co_(3)O_(4)with Ir loading of 3.67 wt%requires 294±4 mV/285±3 mV and 326±2 mV to deliver 10 mA cm^(-2)in alkaline(0.1 M KOH/1.0 M KOH)and acidic(0.5 M H_(2)SO_(4))solution,respectively,with good stability.

Distributed IRS-Aided DF Relaying Systems:Performance Analysis and Optimization

Intelligent reflecting surface(IRS)is a newly emerged and promising paradigm to substantially improve the performance of wireless communications by constructing favorable communication channels via properly tuning massive reflecting elements.This paper considers a distributed IRS aided decode-and-forward(DF)relaying system over Nakagami-m fading channels.Based on a tight approximation for the distribution of the received signalto-noise ratio(SNR),we first derive exact closed-form expressions of the outage probability,ergodic capacity,and energy efficiency for the considered system.Moreover,we propose the optimal IRS configuration considering the energy efficiency and pilot overhead.Finally,we compare the performance between the distributed IRS-aided DF relaying and multi-IRS-only systems,and verify the analytical results by using monte carlo simulations.

Outage Analysis of Optimal UAV Cooperation with IRS via Energy Harvesting Enhancement Assisted Computational Offloading

The utilization of mobile edge computing(MEC)for unmanned aerial vehicle(UAV)communication presents a viable solution for achieving high reliability and low latency communication.This study explores the potential of employing intelligent reflective surfaces(IRS)andUAVs as relay nodes to efficiently offload user computing tasks to theMEC server system model.Specifically,the user node accesses the primary user spectrum,while adhering to the constraint of satisfying the primary user peak interference power.Furthermore,the UAV acquires energy without interrupting the primary user’s regular communication by employing two energy harvesting schemes,namely time switching(TS)and power splitting(PS).The selection of the optimal UAV is based on the maximization of the instantaneous signal-to-noise ratio.Subsequently,the analytical expression for the outage probability of the system in Rayleigh channels is derived and analyzed.The study investigates the impact of various system parameters,including the number of UAVs,peak interference power,TS,and PS factors,on the system’s outage performance through simulation.The proposed system is also compared to two conventional benchmark schemes:the optimal UAV link transmission and the IRS link transmission.The simulation results validate the theoretical derivation and demonstrate the superiority of the proposed scheme over the benchmark schemes.

Intelligent Reflecting Surface Assisted Transmission Optimization Strategies in Wireless Networks

Wireless Power Transfer(WPT)technology can provide real-time power for many terminal devices in Internet of Things(IoT)through millimeterWave(mmWave)to support applications with large capacity and low latency.Although the intelligent reflecting surface(IRS)can be adopted to create effective virtual links to address the mmWave blockage problem,the conventional solutions only adopt IRS in the downlink from the Base Station(BS)to the users to enhance the received signal strength.In practice,the reflection of IRS is also applicable to the uplink to improve the spectral efficiency.It is a challenging to jointly optimize IRS beamforming and system resource allocation for wireless energy acquisition and information transmission.In this paper,we first design a Low-Energy Adaptive Clustering Hierarchy(LEACH)clustering protocol for clustering and data collection.Then,the problem of maximizing the minimum system spectral efficiency is constructed by jointly optimizing the transmit power of sensor devices,the uplink and downlink transmission times,the active beamforming at the BS,and the IRS dynamic beamforming.To solve this non-convex optimization problem,we propose an alternating optimization(AO)-based joint solution algorithm.Simulation results show that the use of IRS dynamic beamforming can significantly improve the spectral efficiency of the system,and ensure the reliability of equipment communication and the sustainability of energy supply under NLOS link.

Energy Efficiency Maximization in Mobile Edge Computing Networks via IRS assisted UAV Communications

In this paper,we investigate the energy efficiency maximization for mobile edge computing(MEC)in intelligent reflecting surface(IRS)assisted unmanned aerial vehicle(UAV)communications.In particular,UAVcan collect the computing tasks of the terrestrial users and transmit the results back to them after computing.We jointly optimize the users’transmitted beamforming and uploading ratios,the phase shift matrix of IRS,and the UAV trajectory to improve the energy efficiency.The formulated optimization problem is highly non-convex and difficult to be solved directly.Therefore,we decompose the original problem into three sub-problems.We first propose the successive convex approximation(SCA)based method to design the beamforming of the users and the phase shift matrix of IRS,and apply the Lagrange dual method to obtain a closed-form expression of the uploading ratios.For the trajectory optimization,we propose a block coordinate descent(BCD)based method to obtain a local optimal solution.Finally,we propose the alternating optimization(AO)based overall algorithmand analyzed its complexity to be equivalent or lower than existing algorithms.Simulation results show the superiority of the proposedmethod compared with existing schemes in energy efficiency.

基于蒙特卡罗模拟散射效应和异质性对高剂量率192Ir近距离治疗剂量分布的影响

目的:探究散射效应和异质性对高剂量率192Ir近距离治疗剂量分布的影响。方法:用MCNP5蒙特卡罗方法模拟Flexisource HDR192Ir放射源的TG-43剂量学参数:剂量率常数Λ、径向剂量函数g(r)、各向异性函数F(r,θ)。基于临床分别构建身体围度差异、偏心、浅表三种非完全散射和组织成分差异、肺插植、腔道插植三种异质性的简化模型,分别计算放射源的径向剂量分布,并通过比较各简化模型和标准模型的同点径向剂量的偏差来评价散射效应和异质性对剂量分布的影响。结果:Λ、g(r)和F(r,θ)模拟值和TPS数据的偏差均小于1%;非完全散射:TPS高估2 cm、5 cm、10 cm处的真实剂量可达约4%、14.8%、16.4%;皮质骨:TPS高估2 cm、5cm、10 cm处的真实剂量约0.7%、1.14%、10%;肿瘤介质:TPS高估真实剂量平均约1.1%;肺介质:TPS高估0.5 cm~6 cm内的真实剂量平均约1.80%,低估6 cm~15 cm内的真实剂量平均约7.77%;肺插植:半径1 cm肿瘤,TPS高估0.5 cm~8 cm内的真实剂量平均约4%,低估8 cm~15 cm内的真实剂量平均约7.8%;腔道插植:半径为1 mm、4 mm、8 mm腔道,TPS低估真实剂量平均约0.75%、1.30%、2.48%。结论:忽略散射效应和异质性会引入显著的剂量误差。临床治疗时,校正患者真实的剂量分布是必要的。

5+2轻断食模式通过IRS1/PI3K/AKT通路激活自噬缓解2型糖尿病大鼠肾损伤

目的探究轻断食模式缓解2型糖尿病大鼠肾损伤的机制。方法将SD大鼠分为正常组、糖尿病组、轻断食+糖尿病组、MHY1485+轻断食+糖尿病组和740 Y-P+轻断食+糖尿病组,每组5只,除正常组外,其余各组均采用喂养高脂高糖饲料联合链脲佐霉素建立2型糖尿病大鼠模型。轻断食模式采用高脂高糖饲料喂食12 h禁食36 h的方法干预12 w,采用生化检测仪检测血清中肾功能指标。ELISA试剂盒检测大鼠空腹血清胰岛素(fasting serum insulin,FIN),并计算其胰岛素抵抗指数(HOMA-IR);qPCR检测IRS1、WT1、LC3B和P62的mRNA表达水平,Western Blot检测大鼠肾脏组织的IRS1、WT1、P62和LC3I/II蛋白的表达水平,研究IRS1/PI3K/AKT通路及自噬相关指标。取肾脏组织进行HE、PAS染色观察病理变化,采用免疫组化检测P62和LC3B的表达;最后采用Tunel染色评估肾脏组织凋亡情况。结果与正常组相比,糖尿病组的大鼠血清中血肌酐(serum creatinine,Scr)、尿素氮(blood urea nitrogen,BUN)、血脂甘油三酯(triglyceride,TG)、总胆固醇(total cholesterol,TCHO)、血清游离脂肪酸(free fatty acid,FFA)含量、空腹FINS、HOMA-IR均升高;而经轻断食模式后,上述指标含量均降低,与此同时qPCR和Western Blot结果显示,轻断食模式+糖尿病组相较于糖尿病组会下调IRS1表达,降低PI3K和AKT的磷酸化水平,从而影响LC3B表达上升,P62表达下降,使得肾脏组织的自噬活性提高,这与免疫组化的结果表现一致;病理染色证明轻断食使肾脏组织损伤减少,凋亡情况得到缓解,从WT1的上调也可看出足细胞损伤也到恢复。结论轻断食模式通过下调IRS1,抑制PI3K/AKT通路提高自噬活性,可缓解2型糖尿病大鼠肾损伤。缓解肾脏组织损伤对于延缓糖尿病肾病的发展有重要的意义。

IRS辅助供能的多用户MEC系统性能研究

在物联网(IoT)场景中,边缘服务器可有效缓解IoT设备计算能力有限的问题,如何保证IoT设备的能量供应成为研究热点之一.无线能量传输(WPT)与移动边缘计算(MEC)的组合是一种解决方案,但混合接入点(HAP)与IoT设备之间不能保证总是存在直连链路.为了处理这个问题,考虑利用智能反射表面(IRS)辅助无线能量传输与任务卸载.在多用户MEC系统下,当IoT设备采用二进制卸载时,联合能量传输时间优化、卸载决策以及调度顺序以求得最小系统处理时延问题是一个混合整数非凸问题.考虑HAP与IoT设备之间的信道差异,采用一种两层交替迭代的算法,并利用MEC的计算能力最小化系统处理时延.实验结果表明,所用方法收敛快,能有效缩短系统处理时延,在IRS的辅助下能明显提升系统性能.

桂枝茯苓丸联合克罗米芬及二甲双胍治疗多囊卵巢综合征合并胰岛素抵抗疗效观察

目的:观察克罗米芬及二甲双胍联合桂枝茯苓丸治疗多囊卵巢综合征(PCOS)合并胰岛素抵抗(IR)的效果。方法:100例随机分为两组各50例,两组均给予克罗米芬和二甲双胍治疗,观察组加用桂枝茯苓丸治疗。结果:治疗后观察组主症积分、次症积分及总积分均低于对照组(P<0.05),胰岛素抵抗指数低于对照组(P<0.05),血清LH、FSH、T水平低于对照组(P<0.05),排卵率、妊娠成功率高于对照组(P<0.05)。治疗后两组BMI、PBF、WHR指标均下降,且观察组BMI、WHR低于对照组(P<0.05)。总有效率观察组高于对照组(P<0.05)。结论:桂枝茯苓丸联合克罗米芬及二甲双胍治疗多囊卵巢综合征合并胰岛素抵抗可提高妊娠率,临床效果较好。

Electricity Generation from Heatwaves

We chose a definition of heatwaves (HWs) that has ~4-year recurrence frequency at world hot spots. We first examined the 1940-2022 HWs climatology and trends in lifespan, severity, spatial extent, and recurrence frequency. HWs are becoming more frequent and more severe for extratropical mid- and low-latitudes. To euphemize HWs, we here propose a novel clean energy-tapping concept that utilizes the available nano-technology, micro-meteorology knowledge of temperature distribution within/without buildings, and radiative properties of earth atmosphere. The key points for a practical electricity generation scheme from HWs are defogging, insulation, and minimizing the absorption of infrared downward radiation at the cold legs of the thermoelectric generators. One sample realization is presented which, through relay with existing photovoltaic devices, provides all-day electricity supply sufficient for providing air conditioning requirement for a residence (~2000-watt throughput). The provision of power to air conditioning systems, usually imposes a significant stress on traditional city power grids during heatwaves.

5G在智能光伏电站中应用研究

近年来,第五代移动通信技术(5G)凭借新的无线传输和组网技术逐步被运用于各个行业。由于高速率、低时延、大连接、高精度等特点,5G高度契合工业智能领域并推动工业领域智能化、信息化变革。5G结合大数据、人工智能等技术,将人员、机器和设备连接构建融合统一的工业物联网,能显著提高效率,同时有效节约人力和物力投入。5G技术在智能光伏电站中的应用研究主要涉及两个方面:一是通过5G网络实现电站内部各部件之间的互联互通,提高电站的运行效率和稳定性;二是通过5G网络实现电站与外界能源网格、用户之间的信息交互,达到更加精准、高效的能源管理。提出了基于智能反射面(IRS)的5G数据传输增强技术,实验结果表明,该方案可以在智能光伏电站实现高可靠性的安全数据传输。

智能反射面辅助多用户大规模MIMO系统的联合波束成形

智能反射面(Intelligent Reflecting Surface,IRS)作为面向第6代通信的关键技术之一具有创新、高效、节能和成本效益高等特点,但其联合波束成形设计为非凸优化问题,仍然是具有挑战的难题。为此,提出了一种用于IRS辅助多用户大规模多输入多输出系统的联合波束成形设计方案,以实现系统数据速率最大化。该方案在基站端采用迫零波束成形以消除用户间干扰,同时在IRS端设计了近最优反射波束成形以实现系统和数据速率最大化。仿真结果表明,该方案可获得较高的系统和数据速率,也为IRS位置布局的选择提供了数据支持与参考准则。