symmetric matrix optimization

Hi,guys:

We meet with an integer optimization defined as follows:

$\displaystyle v^{*} = argmax \quad

\frac{v^{T}X^{T}\left(\sum_{j=1}^{m}{b_iw_i^{T}}\r ight)Xv}{\sqrt{v^{T}X^{T}Xv}}

$

Where v denotes $\displaystyle n$ dimensional column parameter vector,

the domain of which is all permutations of $\displaystyle \left\{{1-n,2-n,

\ldots,2i-n-1,\ldots,n-1}\right\}$. The entries matrix $\displaystyle X

\in \mathcal{R}^{n \times s}$ are known. $\displaystyle b_i,w_i$

are $\displaystyle n$ dimensional column vector.

**Our Goal**

Design a polynomial order algorithm to solve this problem.

Appreciate you very much for your suggestion and advice.