Study on Ultra High-speed Processing Technologies for Photonic and Radio Signals

在本研究中，我们研究了利用光子与无线电波相结合的超高速信号处理技术提供的无线电代理技术和虚拟无线电自由空间光子网络，以实现开放频率智能无线网络（OFINe），根据用户的需求和环境提供灵活的频谱操作和空中接口适配。无线代理技术：首先，我们提出了分层调制方案，根据图像或视频中频率分量的重要性和无线链路质量自适应控制调制格式。计算机仿真结果表明，该方法具有良好的退化特性，提高了信噪比的质量。作为一种扩展方案，我们进一步提出了分层调制代理系统。为了最大程度地提高用户的满意度，该系统综合考虑了用户所要求的服务质量和用户所要求的信息内容的重要性，选择了最优的信号格式。计算机仿真结果表明，所提出的智能体系统能够实现传输时延与接收质量的兼容，同时保持频谱效率的最大化。针对正交多载波调制，我们提出了一种新型的非线性补偿方案，即利用保护时间的频率采集方案和预dft空间分集方案，可以在同一频率信道中实现空分多址。虚拟无线自由空间光子网络：无线信号在虚拟无线自由空间光子网络中使用光子带宽作为其自由空间。首先，为了实现该网络对各种类型空口即多载波无线业务的可复用性，我们提出了光子啁啾复用变换系统和光子无线电分组异步传输方案。理论分析表明，它传输的无线电信号质量好。其次，我们提出了直接光交换CDMA系统，其中光子码空间可以实现光纤中的虚拟无线电自由空间，并提出了一种新的高阶带通采样方案来提高DOS-CDMA的过程增益。第三，我们从理论上和实验上研究了当我们使用不等于带通采样周期的编码周期来提高DOS-CDMA对各种无线电信号格式的透明度时所产生的频谱混叠失真。结果表明，所需的芯片速率可以降低所需的失真功率。此外，我们还提出了一种新的混叠消除方法。少

In this research, we have studied Radio Agents Technologies and Virtual Radio Free Space Photonic Networks provided by Ultra High Speed Signal Processing Techniques using Combined Photonic & Radio-wave Technologies in order to realize Open Frequency Intelligent Wireless Networks (OFINe) providing Flexible Spectrum Operation and Air Interfaces Adaptation to users according to their demands and environments.Wireless Agents Techniques : First, we have newly proposed the Hierarchical Modulation scheme to adaptively control modualation formats according to the importance of frequency components in a picture or a video and the wireless link quality. Computer simulations have shown its graceful degradation characteristics and PSNR quality improvement. As an expanded scheme, furthermore, we have proposed the Hierarchical Modulation Agent System. In order to maximize the degree of users' satisfaction, this novel system chooses an optimum signal format by considering both the requested QoS and t … More he importance of requested information contents. Computer simulations have clarified that the proposed agent system can realize the compatibility between the transferring delay and the received quality keeping the spectral effciency maximal. Regarding orthogonal multi-carrier modulations, we have proposed a new type of nonlinear compensation schemes, frequency acquisition schemes using the guard time and the pre-DFT spatial diversity scheme, which can realize Spatial Division Multiple Access in the same frequency channel.Virtual Radio Free Space Photonic Networks : Radio signal use photonic bandwidth as their free spaces in Virtual Radio Free Space Photonic Networks. First, to realize the university of this network for various type of air-interfaces, that is multi-carrier wireless services, we have newly proposed the photonic chirp multiplexing transforming systems and the photonic radio packet asynchronous transferring scheme. Theoretical analyses have clarified its good quality of transferred radio signals. Second, we have newly proposed Direct Optical Switching CDMA system where photonic code spaces can realize the virtual radio free space in optical fibers, and proposed a novel higher order bandpass sampling scheme to improve the process gain of DOS-CDMA. Third, we have theoretically and experimentally examine the spectral aliasing distortion occurring when we use the code period not equal to the bandpass sampling period to improve the transparency of DOS-CDMA for various radio signal formats. The results show the required chip rates to reduce the required distortion power. Moreover, we have also proposed an novel aliasing canceller. Less