# A question on discrete fourier transform

1. Oct 17, 2012

### navneet1990

i have to take DFT on a signal.

S(n)= exp[2*pi*j*[A*((Nx)^2)]

where A is a constant

Nx = (n-x)

where n runs from (-N/2) to (N/2-1) and x is some constant between the same limits...

now i have to take a DFT for this...
How am i supposed to go about??

should the DFT multiplicant be exp[-2*pi*j*k*n/N] or exp[-2*pi*j*k*(Nx)/N]

if i consider Nx then a constant term exp[+2*pi*j*k*x/N] will come out of the summation...
how does that affect the overall result??

and how do i do a summation of a exponential with square terms inside?