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Research on Direction Finding Algorithms of Non-circular Signals and Its DSP Realization

Author: RenZuo
Tutor: WuZuo
School: PLA Information Engineering University
Course: Communication and Information System
Keywords: Direction of Arrival Estimation Noncircular signals Colored noise Signal number estimation MUSIC algorithm ESPRIT algorithm Propagator algorithm
CLC: TN911.7
Type: Master's thesis
Year: 2009
Downloads: 44
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Abstract


Spatial spectrum estimation to array signal processing, an important branch, are widely used in communication, exploration, astronomy, and other fields. To improve the performance of the spatial spectrum estimation to more and more attention in recent years, the use of the statistical properties of the signal. For example, widely used in modern communication systems, such as BPSK, MASK, AM and PAM modulation signal, different statistical properties of different phase rotation due to the signal obtained after, it is called a non-circular signals. Finding the characteristics of the type of signal elliptical covariance nonzero number of signals that can be processed is greater than the number of array elements, and finding improved performance. For non-circular signal direction finding technology research, the main contents are as follows: 1. Study estimated the number of non-circular signals algorithm. The first non-circular white Gaussian noise signal number estimation algorithm research, combined with non-circular signal characteristics deduced penalty function in the estimation of the number of non-circular signals. Simulation such algorithm can improve the estimated probability of success. Then the number of colored noise estimation algorithm is studied, given the non-circular signal number two improved estimation algorithm (NC-KIC, NC-CMDL algorithm). Simulation of NC-KIC algorithm has better performance in low signal-to-noise ratio, the small number of snapshots, NC-CMDL algorithm complexity scalability array. Finally, a noncircular signals with circular signals while estimates of the number of the incident antenna array signal method. 2 one-dimensional measurement of non-circular signals based on the MUSIC algorithm and ESPRIT algorithm to algorithm. Introduced the first non-circular MUSIC (NC-MUSIC) algorithm, and the algorithm for computing the data from the complex field transform to the real number field, the amount of computation decline cited Ruou La formula. Simulation such algorithm is able to break through the array degrees of freedom, and finding improved performance, cited Ruou La formula to reduce the complexity of the algorithm while finding properties remain unchanged. Non-circular ESPRIT algorithm is then introduced, and the introduction of a unitary transformation is the same data operation of the algorithm to the real number field transform by the complex field. Simulation results show that the two algorithms to estimate the number of signals is greater than the number of array elements, and can improve performance measurement to reduce the complexity of the algorithm, the introduction of the unitary transformation while finding properties remain unchanged. 3. Noncircular signals Finding Algorithm. Two Parallel Linear Array, the first of a two-dimensional ESPRIT (2D-ESPRIT) measured to the algorithm, then the measurement of two-dimensional non-circular feature based on signal to the algorithm (2D-NC-ERARE) introduced. Simulation algorithm capable of handling much larger than the number of signal based on the non-circular characteristics measured element number, and does not require pairing parameters, requires only one-dimensional spectrum peak search, measured to better performance. Research noncircular signals with circular signals simultaneously the incident antenna array direction finding algorithm. (NCAC-MUSIC) algorithm based on MUSIC algorithm for noncircular signals with circular signal measured for the first introduction, and then introduced the propagator method to improve the algorithm (MNCAC-MUSIC algorithm). Simulation to verify the performance of the improved algorithm with the original algorithm basically the same, the complexity of the algorithm. Noncircular signals with low complexity round signal incident on the ADSP TS201 finding algorithm (MNCAC-MUSIC algorithm) programming. The program through a series of measures to be optimized, and gives the operation process and operation results.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication theory > Signal processing
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