Methods and apparatus for transmitting modulation signals
A plurality of multicarrier signals is generated. Each of the plurality of multicarrier signals includes a pilot symbol sequence at a same temporal point in each multicarrier signal. Each pilot symbol sequence includes a plurality of pilot symbols with non-zero amplitude. The pilot symbol sequences are orthogonal to each other at the same temporal point. A quantity of the plurality of pilot symbols in each pilot symbol sequence is greater than or equal to a quantity of the plurality of multicarrier signals to be transmitted. The plurality of multicarrier signals are transmitted in an identical frequency band from a plurality of antennas. The plurality of antennas includes two, three, or four antennas.
1. A method of transmitting multicarrier signals comprising:
generating a plurality of multicarrier signals, each of the plurality of multicarrier signals including a pilot symbol sequence at a same temporal point in each multicarrier signal, and each pilot symbol sequence having a plurality of pilot symbols with non-zero amplitude,
wherein the pilot symbol sequences are orthogonal to each other at the same temporal point, and
wherein a quantity of the plurality of pilot symbols in each pilot symbol sequence is greater than or equal to a quantity of the plurality of multicarrier signals to be transmitted; and
transmitting, in an identical frequency band, the plurality of multicarrier signals from a plurality of antennas, wherein the plurality of antennas comprises two, three, or four antennas.
2. The method of claim 1 , wherein the plurality of pilot symbols are for estimating a frequency offset and/or for synchronization.
3. The method of claim 1 , wherein the plurality of pilot symbols each include real or complex numbers.
4. The method of claim 1 , wherein each of the plurality of multicarrier signals includes independent transmission data.
5. The method of claim 1 , wherein the plurality of pilot symbols includes four, eight, or more pilot symbols.
6. The method of claim 1 , wherein the plurality of antennas includes a number of transmit antennas that is greater than or equal to a number of independent multicarrier signals.
7. Apparatus for transmitting multicarrier signals, the apparatus comprising one or more processing circuits configured to:
generate a plurality of multicarrier signals, each of the plurality of multicarrier signals including a pilot symbol sequence at a same temporal point in each multicarrier signal, and each pilot symbol sequence having a plurality of pilot symbols with non-zero amplitude,
wherein the pilot symbol sequences are orthogonal to each other at the same temporal point, and
wherein a quantity of the plurality of pilot symbols in each pilot symbol sequence is greater than or equal to a quantity of the plurality of multicarrier signals to be transmitted; and
transmit, in an identical frequency band, the plurality of multicarrier signals from a plurality of antennas, wherein the plurality of antennas comprises two, three, or four antennas.
8. The apparatus of claim 7 , wherein the plurality of pilot symbols are useable to estimate a frequency offset and/or for synchronization.
9. The apparatus of claim 7 , wherein the plurality of pilot symbols each include real or complex numbers.
10. The apparatus of claim 7 , wherein each of the plurality of multicarrier signals includes independent transmission data.
11. The apparatus of claim 7 , wherein the plurality of pilot symbols includes four, eight, or more pilot symbols.
12. The apparatus of claim 7 , wherein a number of transmit antennas is greater than or equal to a number of independent multicarrier signals.
13. At least one non-transitory computer-readable medium encoded with instructions that, when executed by a processor, perform:
generating a plurality of multicarrier signals, each of the plurality of multicarrier signals including a pilot symbol sequence at a same temporal point in each multicarrier signal, and each pilot symbol sequence having a plurality of pilot symbols with non-zero amplitude,
wherein the pilot symbol sequences are orthogonal to each other at the same temporal point, and
wherein a quantity of the plurality of pilot symbols in each pilot symbol sequence is greater than or equal to a quantity of the plurality of multicarrier signals to be transmitted; and
transmitting, in an identical frequency band, the plurality of multicarrier signals from a plurality of antennas, wherein the plurality of antennas comprises two, three, or four antennas.
14. The non-transitory computer-readable medium of claim 13 , wherein the plurality of pilot symbols are useable to estimate a frequency offset and/or for synchronization.
15. The non-transitory computer-readable medium of claim 13 , wherein the plurality of pilot symbols each include real or complex numbers.
16. The non-transitory computer-readable medium of claim 13 , wherein each of the plurality of multicarrier signals includes independent transmission data.
17. The non-transitory computer-readable medium of claim 13 , wherein the plurality of pilot symbols includes four, eight, or more pilot symbols.
18. The non-transitory computer-readable medium of claim 13 , wherein a number of transmit antennas is greater than or equal to a number of independent multicarrier signals.