Title :
An effective direction estimation algorithm in multipath environment based on fourth-order cyclic cumulants
Author :
Jiang, Hong ; Wang, Shu-xun ; Lu, Hai-Jun
Author_Institution :
Coll. of Commun. Eng., Jilin Univ., Changchun, China
Abstract :
In order to improve the direction estimation performance of noise-suppression and signal-selectivity in multipath environment of mobile communications, we develop a novel multipath direction finding algorithm by exploiting higher order cyclostationarity of communication signals. Firstly, the fourth-order cyclic cumulant matrices of the received signals are constructed and the generalized steering vector is estimated based on EVESPA algorithm, then forward-backward linear prediction (FBLP) method with subarrays is used to resolve the DOAs of each group of coherent signals of interest (SOIs), which can improve resolution of closely spaced coherent signals in small data length. Part of the array can be arbitrary, and unlike EVESPA algorithm, the total number of signals (SOIs and interferences) impinged on the array can be more than 2K(K-1)/3 with K-sensor uniform linear subarray and a maximum of 2K(K-1)/3 coherent SOIs can be resolved. The simulations show the advantages of the proposed method compared with EVESPA algorithm.
Keywords :
antenna arrays; array signal processing; direction-of-arrival estimation; higher order statistics; matrix algebra; mobile radio; multipath channels; prediction theory; radio direction-finding; signal resolution; DOA; EVESPA algorithm; FBLP method; SOI; cyclostationarity communication signal; direction-of-arrival estimation; forward-backward linear prediction; fourth-order cyclic cumulant matrix; mobile communication; multipath direction finding algorithm; noise-suppression; signal construction; signal resolution; signal-selectivity; signals of interest; uniform linear subarray; Additive noise; Direction of arrival estimation; Gaussian noise; Higher order statistics; Interference; Linear antenna arrays; Mobile communication; Signal resolution; Vectors; Working environment noise;
Conference_Titel :
Signal Processing Advances in Wireless Communications, 2004 IEEE 5th Workshop on
Print_ISBN :
0-7803-8337-0
DOI :
10.1109/SPAWC.2004.1439245