The Relation Between Nulls Of Smart Antenna Pattern And Character Of The Eigenvalues Of Constraint Matrix

Smart antenna technology is the one of the key technology in third generation mobile communications system, it has advantages of improving the quality of communications, improving system capability, and so on. The most basic problem of designing antenna array is deciding radiation pattern, if we can specify the positions of the nulls, and make the nulls aim at the interferes on given angle on pattern, it will restrain interferes effectively, and minimize Signal-to-Noise capability drop that is caused by interferes. This pater aim at the character of the eigenvalues of the constraint matrix, the character is the matrix has the same number of big eigenvalues as number of the nulls that the matrix denoted, the first, estimate the bound of the eigenvalues of constraint matrix with one null by using Gersgorin theorem accurately. The second,...