Millimeter-wave modulation device
AssigneeKorea Electronics Technology Institute
InventorsKi Jin Kim, Kwang Ho Ahan, Sang Hoon Park
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Abstract
Provided is a lower power and high efficiency millimeter-wave modulation apparatus capable of modulating digital data into transmitting signals in a millimeter frequency band, the millimeter-wave modulation apparatus including; a modulation part, which carries out a modulation of a constant envelope attribute, and to which a first local oscillation signal is fixed according to a rate of input data; a phase shifter adopted to shift a phase of an output of the modulation part; a power amplifier adopted to amplify an output of the phase shifter; and an antenna connected to an output of the power amplifier.
Claims5
A millimeter-wave modulation apparatus, comprising:
- a plurality of transmitter units;
- and
- a modulation part, which carries out a modulation of a constant envelope attribute, and to which a first local oscillation signal is fixed according to a rate of input data;
- wherein each of the plurality of transmitter units comprises:
- a phase shifter adapted to shift a phase of an output of the modulation part,
- a power amplifier adapted to amplify an output of the phase shifter, and
- an antenna connected to an output of the power amplifier;
- wherein the plurality of transmitter units are connected to the modulation part via a switching device;
- wherein the switching device comprises:
- a plurality of switches installed between the phase shifter of each of the plurality of transmitter units and the modulation part,
- a delay drive part having a plurality of delay locked loops, each of the delayed locked loops is installed between each of the plurality of switches and the modulation part, and
- a delay control part extracting delay information for controlling the delay drive part based on signals transmitted to the phase shifter of each of the plurality of transmitter units via each of the plurality of switches,
- wherein the modulation part is configured to carry out a Minimum Shift Keying (MSK) modulation, and an MSK modulated waveform of the modulation part is represented by the following equation:
- V
- rf
- =
- A
- I
-
- (
- t
- )
-
- cos
-
- (
- π
-
-
- t
- 2
-
- T
- )
-
- cos
-
- (
- 2
-
- π
-
-
- f
- c
-
- t
- )
- -
- A
- Q
-
- (
- t
- )
-
- sin
-
- (
- π
-
-
- t
- 2
-
- T
- )
-
- sin
-
- (
- 2
-
- π
-
-
- f
- c
-
- t
- )
- =
- cos
-
- ⌈
- 2
-
- π
-
-
- f
- c
-
- t
- +
- B
-
- (
- t
- )
-
- π
-
-
- t
- 2
-
- T
- +
- θ
-
- (
- t
- )
- ⌉
- wherein, B(t) represents 1 when AI(t) is the same as AQ(t), or represents −1 when AI(t) is different from AQ(t), and θ(t) represents 0 when AI(t) is 1, or represents π in the remaining cases except therefor.
Dependencies are inferred from the claim text.