4G / 5G
Explore how LTE synchronization, broadcast, reference, control and data channels map onto individual resource elements.
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Learn by doing across telecom, cloud-native, DevOps, and agentic AI—all in your browser, with no installations and no cloud lab bills.
Resource grid: a slot of 14 symbols by 10 resource blocks with control, synchronisation, reference and data channels in distinct colours, and a highlight moving across the symbols.
Pick a topic to launch its live simulation.
Explore how LTE synchronization, broadcast, reference, control and data channels map onto individual resource elements.
Configure NR numerology, bandwidth parts and channels and inspect their live resource-element mapping.
Inspect browser-local packet captures: dissect 4G/5G telecom protocols, follow flows and conversations, and filter packets Wireshark-style.
Move the CU/DU split from RRC down to RF and see fronthaul bandwidth and latency trade off.
Tune μ from 0–4 and watch subcarrier spacing, symbol timing and the 10 ms radio frame recompute live.
Set DL/UL slots and the special-slot symbol split and see the TDD pattern and guard period recompute.
Pick a channel bandwidth and SCS and see how many Resource Blocks NR actually transmits on.
Sweep candidate SSB beams inside a half-frame and see the burst set repeat on its periodicity timer.
Set antenna ports and density and see the RE overhead and mapping pattern change.
Set type, mapping and additional positions and watch DMRS symbol overhead move.
A real Monte-Carlo simulation in your browser: modulate, add noise, demodulate, count errors, trace the BER curve.
See the constellation, Gray-coded bit mapping, and required SNR for each modulation order.