A New Coprime-Array-Based Configuration With Augmented Degrees Of Freedom And Reduced Mutual Coupling

In this thesis,a new type of coprime-array-based structure is proposed to achieve higher Do Fs and less mutual coupling effect.The proposed structure,called NOCA,using a general displacement strategy,has general closed-form expressions for its sensor locations and its achievable Do Fs.Specifically,the proposed NOCA simply uses a general displacement units.Mathematical proofs show that its achievable Do Fs are 2( + + -1)+ 1,and the Do Fs are maximized by taking = ?+12?.Besides,it is also proven that a complementary displacement units can be adopted to further increase the Do Fs by 2,namely up to 2( + + 2-1)+ 1.On the other hand,the increase of Do Fs means a relatively wider distribution of virtual sensors,thus the number of virtual sensors co-locating at a same lag is reduced.Consequently,smaller weight values are obtained,resulting in more robustness against mutual coupling.Finally,extensive simulations show that NOCA can achieve higher Do Fs than the existing structures by using the same number of physical sensors,which leads to stronger resolution capability and higher Do A estimation accuracy.In presence of mutual coupling,simulation results show that the proposed NOCA is more robust than other compared configurations.