为了对先进的长期演进技术(long term evolution-advanced,LTE-Advanced)系统中的多输入多输出(multipleinput and multiple output,MIMO)技术的性能进行评估,简单回顾了LTE-Advanced系统中的2种MIMO技术,即空间复用和空间分集,并介绍...为了对先进的长期演进技术(long term evolution-advanced,LTE-Advanced)系统中的多输入多输出(multipleinput and multiple output,MIMO)技术的性能进行评估,简单回顾了LTE-Advanced系统中的2种MIMO技术,即空间复用和空间分集,并介绍了一种适合LTE-Advanced系统评估的信道模型-IMT-Advanced(international mobile tele-communications-advanced)信道模型。基于该信道模型,通过系统仿真对以上2种关键MIMO技术进行了性能评估。仿真结果表明,不同的MIMO技术、调制方式、码本、复用率及接收方案都对性能有极大的影响。展开更多
介绍了一个24 GHz MIMO FMCW雷达实验平台的开发过程,涉及天线阵列、射频前端、信号处理等内容的设计与实现,并给出了雷达实验平台的实验过程及其实验结果。在雷达信号处理及控制部分集成了一个千兆网口实现与上位机交互信息,可用于雷...介绍了一个24 GHz MIMO FMCW雷达实验平台的开发过程,涉及天线阵列、射频前端、信号处理等内容的设计与实现,并给出了雷达实验平台的实验过程及其实验结果。在雷达信号处理及控制部分集成了一个千兆网口实现与上位机交互信息,可用于雷达实验平台的教学应用及后续开发。与理论教学和软件仿真相比,雷达实验平台以雷达实物系统为载体,以真实场景为测试环境,使得雷达原理课程的讲授更具说服力,对雷达学科的教学具有一定的推动作用。展开更多
The problem of the simultaneous multi-user resource allocation algorithm in orthogonal frequency division multiple access(OFDMA)based systems has recently attracted significant interest.However,most studies focus on m...The problem of the simultaneous multi-user resource allocation algorithm in orthogonal frequency division multiple access(OFDMA)based systems has recently attracted significant interest.However,most studies focus on maximizing the system throughput and spectral efficiency.As the green radio is essential in 5G and future networks,the energy efficiency becomes the major concern.In this paper,we develop four resource allocation schemes in the downlink OFDMA network and the main focus is on analyzing the energy efficiency of these schemes.Specifically,we employ the advanced multi-antenna technology in a multiple input-multiple output(MIMO)system.The first scheme is based on transmit spatial diversity(TSD),in which the vector channel with the highest gain between the base station(BTS)and specific antenna at the remote terminal(RT)is chosen for transmission.The second scheme further employs spatial multiplexing on the MIMO system to enhance the throughput.The space-division multiple-access(SDMA)scheme assigns single subcarrier simultaneously to RTs with pairwise“nearly orthogonal”spatial signatures.In the fourth scheme,we propose to design the transmit beamformers based on the zero-forcing(ZF)criterion such that the multi-user interference(MUI)is completely removed.We analyze the tradeoff between the throughput and power consumption and compare the performance of these schemes in terms of the energy efficiency.展开更多
文摘为了对先进的长期演进技术(long term evolution-advanced,LTE-Advanced)系统中的多输入多输出(multipleinput and multiple output,MIMO)技术的性能进行评估,简单回顾了LTE-Advanced系统中的2种MIMO技术,即空间复用和空间分集,并介绍了一种适合LTE-Advanced系统评估的信道模型-IMT-Advanced(international mobile tele-communications-advanced)信道模型。基于该信道模型,通过系统仿真对以上2种关键MIMO技术进行了性能评估。仿真结果表明,不同的MIMO技术、调制方式、码本、复用率及接收方案都对性能有极大的影响。
文摘介绍了一个24 GHz MIMO FMCW雷达实验平台的开发过程,涉及天线阵列、射频前端、信号处理等内容的设计与实现,并给出了雷达实验平台的实验过程及其实验结果。在雷达信号处理及控制部分集成了一个千兆网口实现与上位机交互信息,可用于雷达实验平台的教学应用及后续开发。与理论教学和软件仿真相比,雷达实验平台以雷达实物系统为载体,以真实场景为测试环境,使得雷达原理课程的讲授更具说服力,对雷达学科的教学具有一定的推动作用。
文摘The problem of the simultaneous multi-user resource allocation algorithm in orthogonal frequency division multiple access(OFDMA)based systems has recently attracted significant interest.However,most studies focus on maximizing the system throughput and spectral efficiency.As the green radio is essential in 5G and future networks,the energy efficiency becomes the major concern.In this paper,we develop four resource allocation schemes in the downlink OFDMA network and the main focus is on analyzing the energy efficiency of these schemes.Specifically,we employ the advanced multi-antenna technology in a multiple input-multiple output(MIMO)system.The first scheme is based on transmit spatial diversity(TSD),in which the vector channel with the highest gain between the base station(BTS)and specific antenna at the remote terminal(RT)is chosen for transmission.The second scheme further employs spatial multiplexing on the MIMO system to enhance the throughput.The space-division multiple-access(SDMA)scheme assigns single subcarrier simultaneously to RTs with pairwise“nearly orthogonal”spatial signatures.In the fourth scheme,we propose to design the transmit beamformers based on the zero-forcing(ZF)criterion such that the multi-user interference(MUI)is completely removed.We analyze the tradeoff between the throughput and power consumption and compare the performance of these schemes in terms of the energy efficiency.
