nr 如何生成dmrs for pusch
时间: 2025-06-22 12:39:25 浏览: 6
### NR PUSCH DMRS Generation Method
In New Radio (NR), the Physical Uplink Shared Channel (PUSCH) Demodulation Reference Signal (DMRS) plays a critical role in ensuring accurate signal demodulation at the receiver side. The process of generating these reference signals involves several key parameters and steps.
The configuration of DMRS includes setting up various attributes such as the number of front-loaded DMRS symbols, additional DMRS positions, scrambling identity, and more[^1]. These configurations are specified by higher layers through RRC signaling or configured via DCI for dynamic scheduling scenarios.
For each slot where there is scheduled PUSCH transmission, UE calculates the time-frequency resources allocated to DMRS based on the provided configuration information. Specifically:
- **Scrambling Sequence Initialization**: A unique initialization value derived from cell-specific and user-specific identifiers ensures orthogonality between different users' transmissions.
- **Mapping Pattern Selection**: Depending on whether single-symbol or double-symbol DMRS patterns are used, appropriate mapping rules apply within the assigned resource blocks[^2].
Here's an example code snippet demonstrating how one might initialize some variables related to DMRS generation in Python-like pseudocode:
```python
def init_dmrs_params(cell_id, n_scid, bwp_size):
# Initialize base sequence generator with specific seed values
c_init = ((cell_id << 9) | n_scid) & 0xFFFFFFFF
dmrs_config = {
'scramblingId': c_init,
'dmrsTypeAPosition': 2, # Example position; actual depends on config
'numDmrsCdmGroupsNoData': calculate_cdm_groups(bwp_size),
...
}
return dmrs_config
```
This function initializes essential parameters required for subsequent stages of DMRS creation including determining CDM groupings without data, which affects density and distribution across frequency bands[^3].
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