1. A digital pre-distortion apparatus comprising:
a coefficient controller which sets a lookup table with a coefficient minimizing difference between an involution of sum of a first absolute output signal having the first number of delays and a second absolute output signal having the second number of delays for an absolute signal of a power amplifier output signal and an input signal of the power amplifier;
an adder which receives a first absolute input signal having the first number of delays and a second absolute input signal having the second number of delays for the absolute signal of a power amplifier input signal and outputs a sum of the first and second absolute input signals; and
a lookup table which connects to the adder and outputs a result value according to the coefficient set in correspondence to the sum of the first and second absolute input signals.
2. The apparatus of claim 1, wherein the adder and the lookup table is connected in series.
3. A digital pre-distortion method comprising:
sampling output signal and input signal of a power amplifier;
setting a lookup table with a coefficient minimizing difference between an involution of sum of a first absolute output signal having the first number of delays and a second absolute output signal having the second number of delays for an absolute signal of a power amplifier output signal and an input signal of the power amplifier;
receiving a first absolute input signal having the first number of delays and a second absolute input signal having the second number of delays for the absolute signal of a power amplifier input signal and outputting a sum of the first and second absolute input signals; and
outputting a result value according to the coefficient set in correspondence to the sum of the first and second absolute input signals.
4. The method of claim 3, wherein the adder and the lookup table is connected in series.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A reflective structure comprising:
a base, and;
a reflective means formed on said base, wherein said base comprises:
a supporting member provided with a first fundamental surface having portions differing in their height and a second fundamental surface having portions differing in their height;
a first undulating portion, formed on said supporting member, having a first recess or projection, and;
a second undulating portion, formed on said supporting member, having a second recess or projection associated with said first recess or projection, wherein said first and second fundamental surfaces are arranged in a first direction at a first fundamental surface pitch,
wherein said first and second undulating portions are arranged in said first direction at a first undulating portion pitch, and wherein a larger pitch of said first undulating portion pitch and said first fundamental surface pitch is a non-integral multiple of a smaller pitch of said first undulating portion pitch and said first fundamental surface pitch,
wherein said supporting member is provided with a third fundamental surface having portions differing in their height, wherein said base comprises a third undulating portion, formed on said supporting member, having a third recess or projection associated with said first recess or projection, wherein said first and third fundamental surfaces are arranged in a second direction at a second fundamental surface pitch. wherein said first and third undulating portions are arranged in said second direction at a second undulating portion pitch, and wherein a larger pitch of said second undulating portion pitch and said second fundamental surface pitch is a non-integral multiple of a smaller pitch of said second undulating portion pitch and said second fundamental surface pitch.
2. A reflective structure as claimed in claim 1, wherein said first undulating portion is continuous with said second undulating portion.
3. A reflective structure as claimed in claim 1, wherein said first fundamental surface pitch is equal to a first pixel pitch.
4. A reflective structure as claimed in claim 3, wherein said reflective means comprises first and second reflectors, said first and second reflectors arranged in said first direction at said first pixel pitch.
5. A reflective structure as claimed in claim 4, wherein said supporting member comprises: a first conductive line; a second conductive line; a first driving element for supplying said first reflector with data from said first conductive line, and; a second driving element for supplying said second reflector with data from said second conductive line, wherein said first and second conductive lines are arranged in said first direction at said first pixel pitch, and wherein said first and second driving elements are arranged in said first direction at said first pixel pitch.
6. A reflective structure as claimed in claim 1, wherein said first undulating portion is continuous with said third undulating portion.
7. A reflective structure as claimed in claim 1, wherein said second fundamental surface pitch is equal to a second pixel pitch.
8. A reflective structure as claimed in claim 7, wherein said supporting member comprises: a third conductive line, a fourth conductive line, and; a third driving element controlled through said third conductive line, wherein said first driving element is controlled through said fourth conductive line, wherein said third and fourth conductive lines are arranged in said second direction at said second pixel pitch, and wherein said first and third driving elements are arranged in said second direction at said second pixel pitch.
9. A reflective structure as claimed in claim 8, wherein said reflective means comprises a third reflector corresponding to said third driving element, said first and third reflectors arranged in said second direction at said second pixel pitch.
10. A reflective structure as claimed in claim 1, wherein said first and second directions are row and column directions, respectively.
11. A reflective structure as claimed in claim 1, wherein said reflective means comprises a reflective line extending in said first direction.
12. An image display device comprising said reflective structure described in claim 1.
13. A reflective structure comprising:
a base, and;
a reflective means formed on said base,
wherein said base comprises:
a supporting member provided with a first fundamental surface having portions differing in their height, a second fundamental surface having portions differing in their height, a third fundamental surface having portions differing in their height;
a first undulating portion formed on said supporting member,
a second undulating portion formed on said supporting member, and;
a third undulating portion formed on said supporting member,
wherein said first and second fundamental surfaces are arranged in a first fundamental surface direction at a first fundamental surface pitch of a plurality of fundamental surface pitch, said first fundamental surface pitch being the smallest of said plurality of fundamental surface pitches,
wherein said first and third fundamental surfaces are arranged in a second fundamental surface direction at a second fundamental surface pitch of said plurality of fundamental surface pitch, said second fundamental surface pitch being equal to said first fundamental surface pitch or being the smallest next to said first fundamental surface pitch,
wherein said first and second undulating portions are arranged in a first undulating portion direction at a first undulating portion pitch of a plurality of undulating portion pitch, said first undulating portion pitch being the smallest of said plurality of undulating portion pitch,
wherein said first and third undulating portions are arranged in a second undulating portion direction at a second undulating portion pitch of said plurality of undulating portion pitch, said second undulating portion pitch being equal to said first undulating portion pitch or the smallest next to said first undulating portion pitch,
and wherein at least one of said first and second undulating portion directions are different from said first and second fundamental surface directions.
14. A reflective structure as claimed in claim 13, wherein said first to third undulating portion are continuous.
15. A reflective structure as claimed in claim 13, wherein said first fundamental surface pitch is equal to a first pixel pitch.
16. A reflective structure as claimed in claim 15, wherein said reflective means comprises first and second reflectors, said first and second reflectors arranged in said first fundamental surface direction at said first pixel pitch.
17. A reflective structure as claimed in claim 16, wherein said supporting member comprises: a first conductive line; a second conductive line; a first driving element for supplying said first reflector with data from said first conductive line, and; a second driving element for supplying said second reflector with data from said second conductive line, wherein said first and second conductive lines are arranged in said first fundamental direction at said first pixel pitch, and wherein said first and second driving elements are arranged in said first fundamental direction at said first pixel pitch.
18. A reflective structure as claimed in claim 17, wherein said supporting member comprises: a third conductive line, a fourth conductive line, and; a third driving clement controlled through said third conductive line, wherein said first driving element is controlled through said fourth conductive line, wherein said third and fourth conductive lines are arranged in said second direction at said second pixel pitch, and wherein said first and third driving elements are arranged in said second direction at said second pixel pitch.
19. A reflective structure as claimed in claim 18, wherein said reflective means comprises, a third reflector corresponding to said third driving element, said first and third reflectors arranged in said second direction at said second pixel pitch.
20. A reflective structure as claimed in claim 13, wherein said reflective means comprises a reflective line extending in said first fundamental surface direction.