NR_PHY: Optimize layer demapping for PDSCH/PUSCH receiver performance#286
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rupanjali-ux wants to merge 2 commits into
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NR_PHY: Optimize layer demapping for PDSCH/PUSCH receiver performance#286rupanjali-ux wants to merge 2 commits into
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- Use switch on mod_order to make memcpy size a compile-time constant, allowing the compiler to inline it as fixed-size vector stores Signed-off-by: Rupanjali <rupanjali.srivastava@openairinterface.org>
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Move layer de-mapping logic into a shared nr_layer_demapping() in nr_phy_common, callable by both UE PDSCH and gNB PUSCH receivers. Signed-off-by: Rupanjali <rupanjali.srivastava@openairinterface.org>
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Optimizes layer de-mapping in the NR receiver path and refactors the implementation into a common function shared by both the UE (PDSCH) and gNB (PUSCH) receive paths.
Commit 1: [NR_UE_PDSCH] Optimize PDSCH layer de-mapping
Uses a switch with a LAYER_DEMAPPING(MO) macro for modulation orders 2, 4, 6, and 8. Since the copy size is now known at compile time, the compiler can replace memcpy calls with inline fixed-size vector stores.
Commit 2: [NR_PHY] Common layer de-mapping implementation
Extract a common nr_layer_demapping() function for both UE and gNB. Update the UE and gNB receive paths to use the shared implementation, reducing code duplication while bringing the same optimization to the gNB PUSCH path.
With ./nr_dlsim -s30 -b106 -R106 -n100 -e25 -x2 -y2 -z2 -P, the layer demapping compute time reduces by ~30x.
Develop:
Post-optimization:
