Trajectory modification technique for polar transmitter
This application discussed trajectory modification techniques for polar transmission architectures. In an example, a method can include receiving a first sample, determining an absolute phase angle change between the first sample and a third sample, and if the first angle change is greater than a threshold phase angle, adjusting phase information of a second sample to provide a modified second sample such that a trajectory associated with the first sample, the modified second sample and the third sample passes through an origin. In an example, the second sample can be received prior to receiving the first sample, and the third sample can be received prior to receiving the second sample.
1. A method for modifying transmission sample trajectory using a phase generation unit, the method comprising:
receiving a first sample for a signed polar transmitter after receiving a second sample;
determining an absolute phase angle change between the first sample and a third sample that is received prior to the second sample;
if the absolute phase angle change is greater than a threshold phase angle, adjusting phase information of the second sample to provide a modified second sample, wherein a trajectory associated with the first sample, the modified second sample and the third sample passes through an origin defined by a zero radius value.
2. The method of claim 1 , including changing a sign of amplitude information of the second sample to provide the modified second sample.
3. The method of claim 1 , wherein amplitude information of the second sample is not adjusted to provide the modified second sample.
4. The method of claim 1 , wherein adjusting the phase information includes setting the phase information of the modified second sample equal to phase information of the first sample.
5. The method of claim 1 , wherein adjusting the phase information includes setting the phase information of the modified second sample equal to phase information of the first sample plus 180 degrees.
6. The method of claim 1 , wherein adjusting the phase information includes setting the phase information of the modified second sample equal to phase information of the first sample minus 180 degrees.
7. The method of claim 1 , wherein adjusting the phase information includes setting the phase information of the modified second sample equal to phase information of the third sample.
8. The method of claim 1 , wherein adjusting the phase information includes setting the phase information of the modified second sample equal to phase information of the third sample plus 180 degrees.
9. The method of claim 1 , wherein adjusting the phase information includes setting the phase information of the modified second sample equal to phase information of the third sample minus 180 degrees.
10. The method of claim 1 , wherein the threshold phase angle is 90 degrees or greater.
11. The method of claim 1 , wherein the threshold phase angle is 135 degrees or greater.
12. The method of claim 1 , wherein the adjusting phase information of the second sample includes adjusting phase information of the second sample to provide a modified second sample using a phase-lock loop (PLL).