Cyclic prefix, live — computed while you read
computed at page load The working half of Cyclic prefix. That page is the explanation; this one is what the simulator can compute about it, kept apart so the written note stays a document rather than a control panel.
In one line. Every number below is produced by
5G Simulation/src/nrsim/while this page renders, from the same code its tests run against — so nothing here can drift from what the written note says.
The prefix at every numerology
N_CP in units of T_c, in microseconds, and as a share of the slot. What collapses with μ is the absolute length — 4.69 µs at 15 kHz, 0.59 at 120 kHz, 0.07 at 960 kHz. The share is near 7 % across FR1 and the low FR2 spacings but is not constant: it reaches 9.6 % at 960 kHz, because every half-subframe still begins with one longer prefix and there are 64 slots in it rather than one.
What that costs an FR2 carrier
The prefix is what a receiver spends on delay spread. At FR2's 120 kHz it is roughly 0.6 µs, which is why mmWave needs the short delay spread of a line-of-sight or near-line-of-sight path.
Where this comes from
Computed, not transcribed. ../widgets/sim_show.py imports the simulator's specification and
parameter tiers inside the engine process. Those tiers are stdlib-only precisely so this is
possible — the engine's own environment has no NumPy, which is also why anything from the physical
layer (LDPC, HARQ, the waveform) cannot appear here and is offered as a nrsim show command on the
written note instead.
This page is generated by tools/make_live_pages.py from LIVE_FOR in that widget. To change
what appears, edit the declaration, not this file.