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DMRS symbols fixes #86

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Merged
catkira merged 1 commit into from
Jul 13, 2026
Merged

DMRS symbols fixes #86

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61 changes: 35 additions & 26 deletions py3gpp/nrPDSCHDMRS.py
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Original file line number Diff line number Diff line change
Expand Up @@ -37,39 +37,48 @@ def nrPDSCHDMRS(cfg: nrPDSCHConfig, carrier: nrCarrierConfig):

# LUT for DMRS occupied symbols positions
def PDSCHDMRSSyms(cfg: nrPDSCHConfig):
assert cfg.MappingType in ["A"], "Mapping type B is not yet implemented"
l1 = 11
typeA_pos = cfg.DMRS.DMRSTypeAPosition
sym_alloc = cfg.SymbolAllocation[1]
add_pos = cfg.DMRS.DMRSAdditionalPosition
dmrs_len = cfg.DMRS.DMRSLength

occupied_syms = np.array([], dtype=int)
occupied_syms = np.append(occupied_syms, typeA_pos)

if sym_alloc in [8, 9]:
occupied_syms = np.append(occupied_syms, 7)
elif sym_alloc in [10, 11]:
if add_pos == 1:
occupied_syms = np.append(occupied_syms, 9)
elif add_pos == 2 or add_pos == 3:
occupied_syms = np.append(occupied_syms, [6, 9])
elif sym_alloc == 12:
if add_pos == 1:
occupied_syms = np.append(occupied_syms, 11)
elif add_pos == 2:
occupied_syms = np.append(occupied_syms, [7, 11])
elif add_pos == 3:
occupied_syms = np.append(occupied_syms, [5, 8, 11])
elif sym_alloc in [13, 14]:
occupied_syms = np.array([typeA_pos], dtype=int)

if dmrs_len == 1: # Table 7.4.1.1.2-3, Type A
if sym_alloc in [8, 9]:
if add_pos > 0:
occupied_syms = np.append(occupied_syms, 7)
elif sym_alloc in [10, 11]:
if add_pos == 1:
occupied_syms = np.append(occupied_syms, 9)
elif add_pos == 2 or add_pos == 3:
occupied_syms = np.append(occupied_syms, [6, 9])
elif sym_alloc == 12:
if add_pos == 1:
occupied_syms = np.append(occupied_syms, 9)
elif add_pos == 2:
occupied_syms = np.append(occupied_syms, [6, 9])
elif add_pos == 3:
occupied_syms = np.append(occupied_syms, [5, 8, 11])
elif sym_alloc in [13, 14]:
if add_pos == 1:
occupied_syms = np.append(occupied_syms, l1)
elif add_pos == 2:
occupied_syms = np.append(occupied_syms, [7, 11])
elif add_pos == 3:
occupied_syms = np.append(occupied_syms, [5, 8, 11])
else: # Table 7.4.1.1.2-4, Type A
if add_pos == 1:
occupied_syms = np.append(occupied_syms, l1)
elif add_pos == 2:
occupied_syms = np.append(occupied_syms, [7, 11])
elif add_pos == 3:
occupied_syms = np.append(occupied_syms, [5, 8, 11])

if dmrs_len == 2:
occupied_syms = [x+1 for x in occupied_syms]
if sym_alloc in [10, 11, 12]:
occupied_syms = np.append(occupied_syms, 8)
elif sym_alloc in [13, 14]:
occupied_syms = np.append(occupied_syms, 10)
elif add_pos > 1:
raise ValueError("add_pos has to be [0, 1] for double-symbol")

occupied_syms = np.concatenate((occupied_syms[np.newaxis], occupied_syms[np.newaxis] + 1), axis=0).T.ravel()

return occupied_syms

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