压缩域直扩测控通信信号载波同步技术

摘要

While compressed sensing is applied to direct sequence communications and tracking,telemetry and command( DS TT&C) systems,the carrier synchronization is an important issue,and there is an inevi-table contradiction between the strict real-time capability and the reconstruction algorithm,which is com-plex and computationally expensive. In order to solve this trouble,a modified compressed domain Costas loop is presented. The technique can directly extract the frequency and phase information from the com-pressed samples of the signal,which no longer needs to reconstruct the original signal. Firstly,on the basis of analyzing signal estimation in compressed domain,the DS TT&C and communication signal processing framework is provided,and then a compressed domain Costas loop is proposed,which is improved from tra-ditional Costas loop. Secondly,the model and its tracking precision are both analyzed in theory. Finally, the technique is verified and analyzed through simulation experiments. The theoretical analysis and simula-tion results show that the provided loop can precisely track and synchronously demodulate the compressed high dynamic signal. The proposed loop may have an important application value in cognitive radio,wide-band DS TT&C and communication systems,etc.%为解决压缩感知理论在直扩测控通信应用过程中面临的压缩域信号载波同步问题，针对重构算法复杂度偏高、计算资源消耗过大与系统实时性要求之间的矛盾，提出了一种改进的压缩域Costas环技术，该环路不再需要进行信号重构，可以直接从压缩域信号中提取频率和相位信息。首先通过压缩域信号估计理论分析，给出了压缩域直扩测控通信信号处理框架，并提出了改进的压缩域Costas环路；然后对环路模型及其跟踪精度进行了理论分析；最后通过计算机仿真验证了该环路技术有效性。理论分析和仿真实验表明环路能够在压缩域中实现高动态信号的高精度载波跟踪和解调处理。压缩域Costas环技术可应用在基于压缩感知的宽带扩频测控通信系统、认知无线电等相关领域，具有一定工程应用价值。