复杂体制BOC调制直扩信号的检测与估计研究

Complex modulation binary offset carrier modulated direct sequence spread spectrum (DS) signals has become a class of complex modulated signal that frequently encountered in the fields of satellite positioning and navigation, communications and other fields, their detection and estimation is becoming a difficult and hot issue in signal processing group.This study focus on the detection and estimation of such signals: ①To improve the existing DS signal blind processing methods, in order to achieve the basic BOC modulation DS signal blind detection and estimation; ②On this basis, further realization of more complex modulation BOC modulated (including DBOC, CBOC, TMBOC, MBOC, TDDM-BOC and AltBOC modulation etc.) DSSS blind signal processing; ③To achieve a complex modulation binary offset carrier modulated DS signal blind processing in the multi-component, multi-path fading, high dynamic, strong noise, strong interference and other complex environment; ④Under the premise of the known priori information of such as pseudo-noise sequence etc., to better address the correlation function multimodal fuzziness, to achieve a complex modulation binary offset carrier modulated DS signals acquisition and tracking under complex environment. Through this study, we will promote and improve the detection and estimation theory and methods of complex modulation binary offset carrier modulated DS signals, to solve difficult problems in the field of practical application, the research results have its clear direction.

复杂体制BOC调制直扩信号已逐渐成为卫星定位导航、通信等领域经常遇到的一类复杂调制信号形式，其检测与估计正逐渐成为信号处理界的热点难点问题。本项研究紧紧围绕该类信号的检测与估计问题展开：①将已有直扩信号盲处理方法改进拓展，以实现对基本BOC调制直扩信号的盲检测与估计；②进一步实现对更加复杂的复合体制BOC调制（包括DBOC、CBOC、TMBOC、MBOC、TDDM-BOC和AltBOC等调制）直扩信号的盲处理；③在多分量、多径衰落、高动态、强噪声、强干扰等复杂环境下实现对复杂体制BOC调制直扩信号的盲处理；④在已知伪码序列等先验信息的前提下更好地解决相关函数多峰模糊性，以实现对复杂环境下的复杂体制BOC调制直扩信号进行捕获与跟踪。通过本项研究，将推动复杂体制BOC调制直扩信号检测与估计理论与方法的完善，解决这些信号在实际应用领域中难以处理的问题，研究成果具有明确的应用方向。

在直接序列扩频基础上引进高速副载波调制，产生了参数可控、频谱分裂的二进制偏移载波（BOC）复杂调制直扩信号，已在导航系统广泛应用，其盲处理已成热点难点问题。.本项研究以复杂体制BOC调制直扩信号的检测与估计问题展开，主要内容如下：①研究直扩及直扩CDMA信号盲检测与估计：用二次谱法实现了带脉冲成形、多径软扩频信号伪码（PN）周期盲估计；用相似度、改进K-means法对短码、非周期长码直扩信号伪码估计，用嵌套迭代最小二乘投影、张量分解+库搜索法等法对异步、多天线、多径长短码DS-CDMA信号伪码盲估计。②研究复杂体制BOC直扩信号盲检测与估计：用相关函数、平均模糊函数、循环自相关函数、频域累积循环谱法对BOC、TDDM-BOC、CBOC、AltBOC等直扩信号多参数盲估计；用PCA、Sanger、RBF神经网络和改进K-means算法对CBOC、TDDM-BOC、AltBOC等信号组合伪码盲估计。③研究信道编码及伪码盲识别。④研究复杂体制BOC直扩信号捕获与跟踪：用伪相关函数、全相位频谱校正、PMF-apFFT等法对BOC、TDDM-sin-BOC、TMBOC等信号捕获；用FRFT、PMF-FRFT、DPT-PMF-FFT等法对高动态BOC、DBOC、高阶DBOC等信号捕获；用Rake通用模型+相关合成运算、DSFMT-PMF-apFFT等法对多径、宽窄带等干扰的BOC、DBOC、CBOC等信号捕获。⑤研究MIMO-OFDM、FBMC等宽带多载波信号盲检测估计及盲源分离。⑥拓展研究音频、图象、微弱信号等处理。.该项目四年来共发表论文96篇（SCI论文21篇，EI论文47篇），参加国际会议1篇次，申请/授权发明专利10/16件，学术技术交流20次，出版专著1部，部分前沿工作引起国内外同行关注，获重庆市自然科学二等奖1项，拓展项目9项，培养毕业研究生34名，达到本项研究预定目标。