Method for determining signal phase rotation of sub-channels within a transmission bandwidth
View Patent ↗A method for determining signal phase rotation of sub-channels within a contiguous transmission bandwidth comprises the steps of: determining a fundamental set of phase rotations; performing a cyclic shift operation for the fundamental set of phase rotations to generate a cyclic-shifted set of phase rotations; multiplying the cyclic-shifted set of phase rotations by a complex constant to generate a final set of phase rotations; and determining the phase rotation of each sub-channel within the contiguous transmission bandwidth according to the final set of phase rotations.
1. A method for determining signal phase rotation of sub-channels within a non-contiguous transmission bandwidth, the method comprising the steps of:
determining a fundamental set of phase rotations;
performing a cyclic shift operation for all of the fundamental set of phase rotations to generate a cyclic-shifted set of phase rotations;
multiplying the cyclic-shifted set of phase rotations by a complex constant to generate a final set of phase rotations; and
determining the phase rotation of each sub-channel within the non-contiguous transmission bandwidth within a communication system according to the final set of phase rotations,
wherein the sub-channels comprise four sub-channels within the non-contiguous transmission bandwidth, and three of the four sub-channels have the same phase rotation, and the remaining sub-channel has a phase rotation with a 180-degree difference from that of the other three sub-channels.
2. The method of claim 1 , wherein the fundamental set is [1, 1, 1, −1], wherein 1 represents a phase rotation of zero degrees and −1 represents a phase rotation of 180 degrees.
3. The method of claim 1 , wherein the fundamental set is [1, j, 1, −j], wherein 1 represents a phase rotation of zero degrees, −1 represents a phase rotation of 180 degrees, j represents a phase rotation of 90 degrees and −j represents a phase rotation of 270 degrees.
4. The method of claim 1 , wherein the complex constant is 1, −1, j or −j, wherein 1 represents a phase rotation of zero degrees, −1 represents a phase rotation of 180 degrees, j represents a phase rotation of 90 degrees and −j represents a phase rotation of 270 degrees.
5. The method of claim 1 , wherein a cyclic shift value applied for the cyclic shift operation is zero, one, two or three.
6. The method of claim 1 , wherein the transmission bandwidth is 80 MHz, and each sub-channel has a bandwidth of 20 MHz.
7. A method for determining signal phase rotation of sub-channels within a non-contiguous transmission bandwidth, the method comprising the steps of:
determining a fundamental set of phase rotations;
performing a cyclic shift operation for all of the fundamental set of phase rotations to generate a cyclic-shifted set of phase rotations;
multiplying the cyclic-shifted set of phase rotations by a complex constant to generate a final set of phase rotations; and
determining the phase rotation of each sub-channel within the non-contiguous transmission bandwidth within a communication system according to the final set of phase rotations,
wherein the sub-channels comprise four sub-channels within the non-contiguous transmission bandwidth, and two of the sub-channels have the same phase rotation, one of the remaining sub-channels has a phase rotation with a positive 90-degree difference from that of the two sub-channels with the same phase rotation, and the other remaining sub-channel has a phase rotation with a negative 90-degree difference from that of the two sub-channels with the same phase rotation.
8. A method for determining signal phase rotation of sub-channels within a non-contiguous transmission bandwidth, the method comprising the steps of:
determining a fundamental set of phase rotations;
replacing a beginning entry or an end entry of successive entries of identical value with zeros to generate a partially-used set of phase rotations and the non-contiguous transmission bandwidth;
performing a cyclic shift operation for all of the partially-used set of phase rotations to generate a cyclic-shifted set of phase rotations;
multiplying the cyclic-shifted set of phase rotations by a complex constant to generate a final set of phase rotations; and
determining the phase rotation of each sub-channel within the non-contiguous transmission bandwidth within a communication system according to the final set of phase rotations, wherein an entry of zero indicates an unused sub-channel,
wherein the sub-channels comprise four sub-channels within the non-contiguous transmission bandwidth, and one sub-channel is not used, two of the sub-channels have the same phase rotation, and the remaining sub-channel has a phase rotation with a 180-degree difference from that of the two sub-channels with the same phase rotation.
9. The method of claim 8 , wherein the replacing step is performed to replace the first or the third entry with zero.
10. The method of claim 8 , wherein the replacing step is performed to replace a non-duplicated entry with zero.
11. The method of claim 10 , wherein the replacing step is performed to replace the second or the fourth entry with zero.
12. The method of claim 8 , wherein the fundamental set is [1, 1, 1, −1], wherein 1 represents a phase rotation of zero degrees and −1 represents a phase rotation of 180 degrees.
13. The method of claim 8 , wherein the fundamental set is [1, j, 1, −j], wherein 1 represents a phase rotation of zero degrees, −1 represents a phase rotation of 180 degrees, j represents a phase rotation of 90 degrees and −j represents a phase rotation of 270 degrees.
14. The method of claim 8 , wherein the complex constant is 1, −1, j or −j, wherein 1 represents a phase rotation of zero degrees, −1 represents a phase rotation of 180 degrees, j represents a phase rotation of 90 degrees and −j represents a phase rotation of 270 degrees.
15. The method of claim 8 , wherein a cyclic shift value applied for the cyclic shift operation is zero, one, two or three.
16. The method of claim 8 , wherein the transmission bandwidth is 80 MHz, and each sub-channel has a bandwidth of 20 MHz.
17. A method for determining signal phase rotation of sub-channels within a non-contiguous transmission bandwidth, the method comprising the steps of:
determining a fundamental set of phase rotations;
replacing a beginning entry or an end entry of successive entries of identical value with zeros to generate a partially-used set of phase rotations and the non-contiguous transmission bandwidth;
performing a cyclic shift operation for all of the partially-used set of phase rotations to generate a cyclic-shifted set of phase rotations;
multiplying the cyclic-shifted set of phase rotations by a complex constant to generate a final set of phase rotations; and
determining the phase rotation of each sub-channel within the non-contiguous transmission bandwidth within a communication system according to the final set of phase rotations, wherein an entry of zero indicates an unused sub-channel,
wherein the sub-channels comprise four sub-channels within the non-contiguous transmission bandwidth, and one sub-channel is not used, two of the sub-channels have the same phase rotation, and the remaining sub-channel has a phase rotation that is different from that of the two sub-channels with the same phase rotation.
18. The method of claim 17 , wherein the remaining sub-channel has a phase rotation with a positive 90-degree difference from that of the two sub-channels with the same phase rotation.
19. The method of claim 17 , wherein the remaining sub-channel has a phase rotation with a negative 90-degree difference from that of the two sub-channels with the same phase rotation.