Antenna switching apparatus based on spatial modulation
An antenna switching apparatus based on spatial modulation includes a plurality of antennas; a control signal generator configured to generate a plurality of switching control signals; and a plurality of switches configured to switch on to apply a transmission signal to the respective antennas according to the respective switching control signals. Further, the antenna switching apparatus includes a delay analyzer configured to receive the transmission signal output from each of the plurality of switches to calculate delay information for synchronizing the switching control signals applied to the respective switches; and a delay adjuster configured to synchronize the switching control signals to apply the synchronized switching control signals to the respective switches according to the calculated delay information.
1. An antenna switching apparatus based on spatial modulation, the antenna switching apparatus comprising:
a plurality of antennas;
a control signal generator configured to generate a plurality of switching control signals;
a plurality of switches installed at respective front stages of the plurality of antennas, and configured to switch on to apply a transmission signal to the respective antennas according to the respective switching control signals;
a delay analyzer configured to receive the transmission signal output from each of the plurality of switches to calculate delay information for synchronizing the switching control signals applied to the respective switches; and
a delay adjuster configured to synchronize the switching control signals to apply the synchronized switching control signals to the respective switches according to the calculated delay information.
2. The antenna switching apparatus of claim 1 , wherein the delay analyzer comprises:
a combiner configured to combine the transmission signals output from the respective switches;
a receiver configured to down-converter the combined transmission signal;
a filter configured to extract only a noise signal from the down-converted signal; and
a delay controller configured to calculate delay information on the basis of the noise signal output from the filter, and supply the delay information to the delay adjuster.
3. The antenna switching apparatus of claim 2 , wherein the receiver converts the combined transmission signal into an IF band signal, and supplies the IF band signal to the filter.
4. The antenna switching apparatus of claim 3 , wherein the filter is a notch filter.
5. The antenna switching apparatus of claim 2 , wherein the receiver converts the combined transmission signal into a baseband signal, and supplies the baseband signal to the filter.
6. The antenna switching apparatus of claim 5 , wherein the filter is a high-pass filter.
7. The antenna switching apparatus of claim 2 , wherein the delay adjuster comprises a plurality of delay lock loops (DLLs) connected to the respective switches, and configured to adjust delay of the switching control signals to be input to the respective switches according to the delay information.
8. An antenna switching apparatus based on spatial modulation, the antenna switching apparatus comprising:
a delay analyzer configured to receive a transmission signal output from each of a plurality of switches connected to a plurality of antennas to calculate delay information for synchronizing switching control signals applied to the respective switches of the plurality of switches, the delay analyzer further comprising:
a combiner configured to combine the transmission signals output from the respective switches;
a receiver configured to down-convert the combined transmission signal;
a filter configured to extract only a noise signal from the down-converted signal; and
a delay controller configured to calculate delay information on the basis of the noise signal output from the filter; and
a delay adjuster configured to synchronize the switching control signals and apply the synchronized switching control signals to the respective switches according to the calculated delay information.
9. The antenna switching apparatus of claim 8 , wherein the receiver converts the combined transmission signal into an IF band signal, and supplies the IF band signal to the filter.
10. The antenna switching apparatus of claim 8 , wherein the filter is a notch filter.
11. The antenna switching apparatus of claim 8 , wherein the receiver converts the combined transmission signal into a baseband signal, and supplies the baseband signal to the filter.
12. The antenna switching apparatus of claim 11 , wherein the filter is a high-pass filter.
13. The antenna switching apparatus of claim 8 , wherein the delay adjuster comprises a plurality of delay lock loops (DLLs) connected to the respective switches, and configured to adjust delay of the switching control signals to be input to the respective switches according to the delay information.
14. An antenna switching apparatus based on spatial modulation, the antenna switching apparatus comprising:
a plurality of antennas;
a control signal generator configured to generate a plurality of switching control signals;
a plurality of switches installed at respective front stages of the plurality of antennas, and configured to switch on to apply a transmission signal to the respective antennas according to the respective switching control signals; and
a delay analyzer configured to receive the transmission signal output from each of the plurality of switches to calculate delay information for synchronizing the switching control signals applied to the respective switches, wherein
the delay analyzer comprises:
a combiner configured to combine the transmission signals output from the respective switches;
a receiver configured to down-converter the combined transmission signal;
a filter configured to extract only a noise signal from the down-converted signal; and
a delay controller configured to calculate delay information on the basis of the noise signal output from the filter, and supply the delay information to the delay adjuster.