Method and apparatus for reference signal configuration of a wireless communication system
A method for reference signal configuration includes: receiving, by a base station, a plurality of uplink sequences from an uplink channel; performing, by the base station, an optimal combining procedure on the plurality of uplink sequences to output a combined result of the plurality of uplink sequences; determining, by the base station, channel signature information based on the combined result; detecting, by the base station, a plurality of complex signals at peak positions from the plurality of uplink sequences based on the channel signature information: estimating, by the base station, a correlation level based on the plurality of complex signals; and determining a density of the reference signal and MCS based on the correlation level.
1. A method for reference signal configuration, the method comprising:
receiving, by a base station, a plurality of uplink sequences from an uplink channel;
performing, by the base station, an optimal combining procedure on the plurality of uplink sequences to output a combined result of the plurality of uplink sequences;
determining, by the base station, channel signature information based on the combined result, wherein the channel signature information comprises a power delay profile;
detecting, by the base station, a plurality of complex signals at peak positions from the plurality of uplink sequences based on the channel signature information;
calculating, by the base station, a signal-to-interference-plus-noise ratio (SINR);
estimating a correlation level based on the plurality of complex signals; and determining
a density of a reference signal and a Modulation and Coding Scheme based on the correlation level, by the base station, when the SINR exceeds a threshold.
2. The method of claim 1 , wherein the uplink channel is a Physical Random Access Channel (PRACH).
3. The method of claim 2 , wherein the uplink sequences for the PRACH are PRACH sequences.
4. The method of claim 1 , wherein the uplink channel is a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).
5. The method of claim 4 , wherein the uplink sequences for the PUCCH or the PUSCH are Demodulation Reference Signals (DM-RSs).
6. The method of claim 1 , wherein the optimal combining procedure is a Maximum Ratio Combining (MRC) procedure.
7. The method of claim 1 , further comprising:
determining, by the base station, a plurality of power peak levels from the plurality of uplink sequences based on the power delay profile; and
estimating, by the base station, a frequency offset based on the plurality of power peak levels.
8. The method of claim 7 , further comprising:
compensating, by the based station, the frequency offset based on the channel signature information.
9. The method of claim 1 , wherein the reference signal is a Demodulation Reference Signal (DM-RS) or a Phase Tracking Reference Signal (PT-RS).
10. The method of claim 1 , further comprising:
determining, by the base station, a higher density of the reference signal and a lower order Modulation and Coding Scheme, when the SINR does not exceed the threshold.
11. A base station, comprising:
one or more non-transitory computer-readable media having computer-executable instructions embodied thereon; and
at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to:
receive a plurality of uplink sequences from an uplink channel;
perform an optimal combining procedure on the plurality of uplink sequences to output a combined result of the plurality of uplink sequences;
determine channel signature information based on the combined result, wherein the channel signature information comprises a power delay profile;
detect a plurality of complex signals at peak positions from the plurality of uplink sequences based on the channel signature information;
calculating a signal-to-interference-plus-noise ratio (SINR);
estimate a correlation level based on the plurality of complex signals; and
determining a density of a reference signal and a Modulation and Coding Scheme based on the correlation level, when the SINR exceeds a threshold.
12. The base station of claim 11 , wherein the uplink channel is a Physical Random Access Channel (PRACH).
13. The base station of claim 12 , wherein the uplink sequences for the PRACH are PRACH sequences.
14. The base station of claim 11 , wherein the uplink channel is a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).
15. The base station of claim 14 , wherein the uplink sequences for the PUCCH or the PUSCH are Demodulation Reference Signals (DM-RSs).
16. The base station of claim 11 , wherein the optimal combining procedure is a Maximum Ratio Combining (MRC) procedure.
17. The base station of claim 11 , wherein the at least one processor is further configured to execute the computer-executable instructions to:
determine a plurality of power peak levels from the plurality of uplink sequences based on the power delay profile; and
estimate a frequency offset based on the plurality of power peak levels.
18. The base station of claim 17 , wherein the at least one processor is further configured to execute the computer-executable instructions to:
compensate the frequency offset based on the channel signature information.
19. The base station of claim 11 , wherein the reference signal is a Demodulation Reference Signal (DM-RS) or a Phase Tracking Reference Signal (PT-RS).
20. The method of claim 11 , further comprising:
determining a higher density of the reference signal and a lower order Modulation and Coding Scheme, when the SINR does not exceed the threshold.