In this paper,the performance of uplink multiuser massive multiple-input multipleoutput(MIMO)system with spatial modulation over transmit-correlated Rayleigh fading channel is investigated,where a large number of ante...In this paper,the performance of uplink multiuser massive multiple-input multipleoutput(MIMO)system with spatial modulation over transmit-correlated Rayleigh fading channel is investigated,where a large number of antennas are deployed at the base station and linear zero-forcing(ZF)receiver is employed for detection.By taking the transmit correlation and the randomness of shadow fading in to account,the bit error rate(BER)performance of the system is analyzed.According to the performance analysis,an approximated expression of overall average BER of the system is attained.Besides,asymptotic performance is studied and the corresponding BER expression at high signal-to-noise ratio is derived.On this basis,the diversity gain of the system can be obtained for performance evaluation.Simulation results show that the derived theoretical expressions match the simulated values well,which verifies the correctness of our analysis.展开更多
遥感摄影在对地观测中的应用日益增多,为了能使更多的人较直观地认识遥感摄影系统,研究开发遥感摄影模拟系统对于在实验室模拟真实遥感摄影系统有重要意义.该模拟装置用普通可见光线阵 CCD 相‘机推帚采集图像,且图像数据无线传输.在电...遥感摄影在对地观测中的应用日益增多,为了能使更多的人较直观地认识遥感摄影系统,研究开发遥感摄影模拟系统对于在实验室模拟真实遥感摄影系统有重要意义.该模拟装置用普通可见光线阵 CCD 相‘机推帚采集图像,且图像数据无线传输.在电路设计中遵从系统模块化设计思想,提出了以 TI 公司的DSP(TMS320VC5402)和 A7121无线收发模组为核心器件的发射系统和接收系统的设计方案,通过 USB 芯片PDIUSBD12实现了采集电路与计算机的通信.给出了相应的硬件设计和软件流程图,调试结果表明该系统可以满足对图像进行实时采集并显示的要求.展开更多
针对红外光通信存在的调制解调复杂、传输距离短等问题,提于一种新颖的脉冲频率（pulse frequency modulation,PFM）调制方式,并设计了4阶带通滤波器滤除带通噪声,构建接收转发电路延长了传输距离。研制了一套宽角度的红外光音频传输系...针对红外光通信存在的调制解调复杂、传输距离短等问题,提于一种新颖的脉冲频率（pulse frequency modulation,PFM）调制方式,并设计了4阶带通滤波器滤除带通噪声,构建接收转发电路延长了传输距离。研制了一套宽角度的红外光音频传输系统。音频传输实验结果表明：该系统实现了较好的音频传输效果,降低了红外光通信系统在传输过程中的功率损耗,延长了传输距离,同时实现了0°~360°传输方向的自主调节,表明本系统具有良好的工程应用价值。展开更多
文摘In this paper,the performance of uplink multiuser massive multiple-input multipleoutput(MIMO)system with spatial modulation over transmit-correlated Rayleigh fading channel is investigated,where a large number of antennas are deployed at the base station and linear zero-forcing(ZF)receiver is employed for detection.By taking the transmit correlation and the randomness of shadow fading in to account,the bit error rate(BER)performance of the system is analyzed.According to the performance analysis,an approximated expression of overall average BER of the system is attained.Besides,asymptotic performance is studied and the corresponding BER expression at high signal-to-noise ratio is derived.On this basis,the diversity gain of the system can be obtained for performance evaluation.Simulation results show that the derived theoretical expressions match the simulated values well,which verifies the correctness of our analysis.
文摘遥感摄影在对地观测中的应用日益增多,为了能使更多的人较直观地认识遥感摄影系统,研究开发遥感摄影模拟系统对于在实验室模拟真实遥感摄影系统有重要意义.该模拟装置用普通可见光线阵 CCD 相‘机推帚采集图像,且图像数据无线传输.在电路设计中遵从系统模块化设计思想,提出了以 TI 公司的DSP(TMS320VC5402)和 A7121无线收发模组为核心器件的发射系统和接收系统的设计方案,通过 USB 芯片PDIUSBD12实现了采集电路与计算机的通信.给出了相应的硬件设计和软件流程图,调试结果表明该系统可以满足对图像进行实时采集并显示的要求.
文摘针对红外光通信存在的调制解调复杂、传输距离短等问题,提于一种新颖的脉冲频率（pulse frequency modulation,PFM）调制方式,并设计了4阶带通滤波器滤除带通噪声,构建接收转发电路延长了传输距离。研制了一套宽角度的红外光音频传输系统。音频传输实验结果表明：该系统实现了较好的音频传输效果,降低了红外光通信系统在传输过程中的功率损耗,延长了传输距离,同时实现了0°~360°传输方向的自主调节,表明本系统具有良好的工程应用价值。
