: s(n,m) = d(n,m), 0 n 4, 0 m 2
( : N = 5, M = 3).
S(k,l) = d(n,m) exp(-j2pnk/5-j2pml/3) = 1 k l, .. . :
s(n,m) =(1/20) exp(j2pnk/5+j2pml/3).
. s(n,m) , RN,M, s(n,m) RN,M s(n,m):
s(n,m) = s(n-aN,m-bM),
s(n, m) = s(n, m), (n, m) < RN,M.
= 0, .
, .
:
S(k, l) = Sa Sb S(k-aN, l-bM).
S(k, l) = S(k, l), 0 k N, 0 l M
= 0, .
s(n,m) S(k,l) (18.5.1-2) :
s(n,m) Þ s(n,m) Û S(k,l) Þ S(k,l).
, (18.5.1-2) , , s(..) s(..), s(..) s(..).
:
1. .
2. .
3. , .
4. , , -.
5. - .
6. , , .. .
. - R P = { : 0 ni Ni-1, i=1,2,3,...,P} Ni:
= ,
P- :
S() = s() exp(-j T2p / ). (18.5.3)
s() = S() exp(j T2p / ). (18.5.4)
( ).
RN,M :
s(n,m)+bz(n,m) Û aS(k,l)+bZ(k,l),
, s(n,m)+bz(n,m). , (..) z(..) . .
|
|
- , ( ). N .
, s(n,m) RP1,P2, a h(n,m) - RQ1,Q2. :
s(n,m) = Sk Sl h(k,l) s(n-k,m-l).
s(n,m):
0 n P1+Q1-1, 0 m P2+Q2-1.
, :
N P1+Q1-1, M P2+Q2-1.