System and method of waveform design for operation bandwidth extension
Different numerologies may be used to communicate orthogonal frequency division multiplexing (OFDM)-based signals over different frequency sub-bands of a given carrier. This may allow the OFDM-based signals to efficiently support diverse traffic types. In some embodiments, the numerology of OFDM-based signal depends on a bandwidth of the frequency sub-band over which the OFDM-based signals are transmitted. In some embodiments, the OFDM-based signals are filtered OFDM (f-OFDM) signals, and the pulse shaping digital filter used to generate the f-OFDM signals allows the receiver to mitigate interference between adjacent f-OFDM signals upon reception, thereby allowing f-OFDM signals to be communicated over consecutive carriers without relying on a guard band.
1. A method for transmitting signals, the method comprising:
transmitting, by a transmit point, a first orthogonal frequency division multiplexing (OFDM)-based signal using a first sub-carrier spacing over a first carrier of a plurality of aggregated carriers for carrier aggregation;
transmitting, by the transmit point, a second OFDM-based signal using a second sub-carrier spacing over the first carrier of the plurality of aggregated carriers for the carrier aggregation; and
transmitting, by the transmit point, a third OFDM-based signal using a third sub-carrier spacing over a second carrier of the plurality of aggregated carriers for the carrier aggregation, wherein
the first carrier has a first carrier bandwidth associated with a first set of numerologies,
the second carrier has a second carrier bandwidth associated with a second set of numerologies,
the first set of numerologies comprises a first numerology associated with the first sub-carrier spacing and a second numerology associated with the second sub-carrier spacing different from the first sub-carrier spacing,
the second set of numerologies comprises a third numerology associated with the third sub-carrier spacing, and
the first carrier bandwidth is wider than the second carrier bandwidth, and both of the first sub-carrier spacing and the second sub-carrier spacing are larger than the third sub-carrier spacing.
2. The method of claim 1 , wherein the second carrier has a 5 MHz carrier bandwidth, and the third sub-carrier spacing is 15 kHz.
3. The method of claim 1 , wherein the first carrier has a carrier bandwidth larger than 5 MHz, and the first sub-carrier spacing, and the second sub-carrier spacing are 30 kHz and 60 kHz, respectively.
4. The method of claim 1 , wherein the first carrier has a 10 MHz, 15 MHz, or 20 MHz carrier bandwidth, and wherein the first set of numerologies further comprises a fourth sub-carrier spacing of 15 kHz or a fifth sub-carrier spacing of 120 kHz.
5. The method of claim 1 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to twenty multiples of any of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
6. The method of claim 1 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to ten multiples of any of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
7. The method of claim 1 , wherein the first set of numerologies comprises a first transmission time interval (TTI) and a second TTI, and the second set of numerologies comprises a third TTI, and wherein both the first TTI and the second TTI are shorter than the third TTI.
8. A transmit point comprising:
a processor; and
a computer readable storage medium storing programming for execution by the processor, the programming comprising instructions to:
transmit a first orthogonal frequency division multiplexing (OFDM)-based signal using a first sub-carrier spacing over a first carrier of a plurality of aggregated carriers for carrier aggregation;
transmit a second OFDM-based signal using a second sub-carrier spacing over the first carrier of the plurality of aggregated carriers for the carrier aggregation; and
transmit a third OFDM-based signal using a third sub-carrier spacing over a second carrier of the plurality of aggregated carriers for the carrier aggregation, wherein
the first carrier has a first carrier bandwidth associated with a first set of numerologies,
the second carrier has a second carrier bandwidth associated with a second set of numerologies,
the first set of numerologies comprises a first numerology associated with the first sub-carrier spacing and a second numerology associated with the second sub-carrier spacing different from the first sub-carrier spacing,
the second set of numerologies comprises a third numerology associated with the third sub-carrier spacing, and
the first carrier bandwidth is wider than the second carrier bandwidth, and both of the first sub-carrier spacing and the second sub-carrier spacing are larger than the third sub-carrier spacing.
9. The transmit point of claim 8 , wherein the second carrier has a 5 MHz carrier bandwidth, and the third sub-carrier spacing is 15 kHz.
10. The transmit point of claim 8 , wherein the first carrier has a carrier bandwidth larger than 5 MHz, and the first sub-carrier spacing, and the second sub-carrier spacing are 30 kHz and 60 kHz, respectively.
11. The transmit point of claim 8 , wherein the first carrier has a 10 MHz, 15 MHz, or 20 MHz carrier bandwidth, and wherein the first set of numerologies further comprises a fourth sub-carrier spacing of 15 kHz or a fifth sub-carrier spacing of 120 kHz.
12. The transmit point of claim 8 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to twenty multiples of any of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
13. The transmit point of claim 8 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to ten multiples of any of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
14. The transmit point of claim 8 , wherein the first set of numerologies comprises a first transmission time interval (TTI) and a second TTI, and the second set of numerologies comprises a third TTI, and wherein both the first TTI and the second TTI are shorter than the third TTI.
15. A method for receiving signals, the method comprising:
receiving, by a receive point from a transmit point, a first orthogonal frequency division multiplexing (OFDM)-based signal using a first sub-carrier spacing over a first carrier of a plurality of aggregated carriers for carrier aggregation;
receiving, by the receive point from the transmit point, a second OFDM-based signal using a second sub-carrier spacing over the first carrier of the plurality of aggregated carriers for the carrier aggregation; and
receiving, by the receive point from the transmit point, a third OFDM-based signal using a third sub-carrier spacing over a second carrier of the plurality of aggregated carriers for the carrier aggregation, wherein
the first carrier has a first carrier bandwidth associated with a first set of numerologies,
the second carrier has a second carrier bandwidth associated with a second set of numerologies
the first set of numerologies comprises a first numerology associated with the first sub-carrier spacing and a second numerology associated with the second sub-carrier spacing different from the first sub-carrier spacing, and
the second set of numerologies comprises a third numerology associated with the third sub-carrier spacing, and wherein
the first carrier bandwidth is wider than the second carrier bandwidth, and both of the first sub-carrier spacing and the second sub-carrier spacing are larger than the third sub-carrier spacing.
16. The method of claim 15 , wherein the second carrier has a 5 MHz carrier bandwidth, and the third sub-carrier spacing is 15 kHz.
17. The method of claim 15 , wherein the first carrier has a carrier bandwidth larger than 5 MHz, and the first sub-carrier spacing and the second sub-carrier spacing are 30 kHz and 60 kHz, respectively.
18. The method of claim 15 , wherein the first carrier has a 10 MHz, 15 MHz, or 20 MHz carrier bandwidth, and wherein the first set of numerologies further comprises a fourth sub-carrier spacing of 15 kHz or a fifth sub-carrier spacing of 120 kHz.
19. The method of claim 15 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to twenty multiples of any one of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
20. The method of claim 15 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to ten multiples of any of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
21. The method of claim 15 , wherein the first set of numerologies comprises a first transmission time interval (TTI) and a second TTI, and the second set of numerologies comprises a third TTI, and wherein both the first TTI and the second TTI are shorter than the third TTI.
22. A receive point comprising:
a processor; and
a computer readable storage medium storing programming for execution by the processor, the programming comprising instructions to:
receive, from a transmit point, a first orthogonal frequency division multiplexing (OFDM)-based signal using a first sub-carrier spacing over a first carrier of a plurality of aggregated carriers for carrier aggregation;
receive, from the transmit point, a second OFDM-based signal using a second sub-carrier spacing over the first carrier of the plurality of aggregated carriers for the carrier aggregation; and
receive, from the transmit point, a third OFDM-based signal using a third sub-carrier spacing over a second carrier of the plurality of aggregated carriers for the carrier aggregation, wherein
the first carrier has a first carrier bandwidth associated with a first set of numerologies,
the second carrier has a second carrier bandwidth associated with a second set of numerologies
the first set of numerologies comprises a first numerology associated with the first sub-carrier spacing and a second numerology associated with the second sub-carrier spacing different from the first sub-carrier spacing, and
the second set of numerologies comprises a third numerology associated with the third sub-carrier spacing, and wherein
the first carrier bandwidth is wider than the second carrier bandwidth, and both of the first sub-carrier spacing and the second sub-carrier spacing are larger than the third sub-carrier spacing.
23. The receive point of claim 22 , wherein the second carrier has a 5 MHz carrier bandwidth, and the third sub-carrier spacing is 15 kHz.
24. The receive point of claim 22 , wherein the first carrier has a carrier bandwidth larger than 5 MHz, and the first sub-carrier spacing and the second sub-carrier spacing are 30 kHz and 60 kHz, respectively.
25. The receive point of claim 22 , wherein the first carrier has a 10 MHz, 15 MHz, or 20 MHz carrier bandwidth, and wherein the first set of numerologies further comprises a fourth sub-carrier spacing of 15 kHz or a fifth sub-carrier spacing of 120 kHz.
26. The receive point of claim 22 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to twenty multiples of any one of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
27. The receive point of claim 22 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to ten multiples of any of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
28. The receive point of claim 22 , wherein the first set of numerologies comprises a first transmission time interval (TTI) and a second TTI, and the second set of numerologies comprises a third TTI, and wherein both the first TTI and the second TTI are shorter than the third TTI.
29. The method of claim 1 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to five multiples of any of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
30. The method of claim 1 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to three multiples of any of the first sub-carrier spacing of one, the second sub-carrier spacing, or the third sub-carrier spacing.
31. The method of claim 1 , wherein the first carrier and the second carrier are separated by a guard band that is equal to any of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
32. The transmit point of claim 8 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to five multiples of any of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
33. The transmit point of claim 8 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to three multiples of any of the first sub-carrier spacing of one, the second sub-carrier spacing, or the third sub-carrier spacing.
34. The transmit point of claim 8 , wherein the first carrier and the second carrier are separated by a guard band that is equal to any of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
35. The method of claim 15 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to five multiples of any of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
36. The method of claim 15 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to three multiples of any of the first sub-carrier spacing of one, the second sub-carrier spacing, or the third sub-carrier spacing.
37. The receive point of claim 22 , wherein the first carrier and the second carrier are separated by a guard band that is equal to any of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
38. The receive point of claim 22 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to five multiples of any of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.
39. The receive point of claim 22 , wherein the first carrier and the second carrier are separated by a guard band that is less than or equal to three multiples of any of the first sub-carrier spacing of one, the second sub-carrier spacing, or the third sub-carrier spacing.
40. The receive point of claim 22 , wherein the first carrier and the second carrier are separated by a guard band that is equal to any of the first sub-carrier spacing, the second sub-carrier spacing, or the third sub-carrier spacing.