Topic hubs
Each hub gives you the lie of the land, a learning path through the relevant lessons, reference tables, and the latest news and papers on that subject.
Wireless foundations
Radio links end to end, bands, bandwidth, SNR and the main system families
02Signals and spectra
Complex baseband, IQ sampling, FFTs, filters, pulse shaping and dB arithmetic
03Antennas and propagation
Antenna gain and arrays, path loss, Friis, fading, Doppler and channel models
04Link budgets and noise
Thermal noise, noise figure, sensitivity, link margin, interference and capacity
05Modulation
Keying a carrier, constellations, bit error rate and adaptive modulation
06Channel coding
Block, convolutional, turbo, LDPC and polar codes, and HARQ in LTE and NR
07OFDM and multicarrier
OFDM, cyclic prefix, NR numerology, OFDMA, DFT-s-OFDM and PAPR
08MIMO and beamforming
Diversity, spatial multiplexing, precoding, massive MIMO and hybrid beamforming
09Synchronisation and estimation
Timing and frequency recovery, channel estimation, equalisation and phase noise
10RF front ends
LNAs, PAs, mixers, oscillators, data converters, linearity and DPD
11Software-defined radio
SDR architectures, GNU Radio, UHD and SoapySDR, sample rates, IQ files
12Cellular 4G LTE
E-UTRAN and EPC, frame structure, resource grid, physical channels
135G NR
NR numerology, bandwidth parts, beam management, the 5G core and Open RAN
146G and research
IMT-2030, 3GPP Release 20 studies, ISAC, RIS, AI in the air interface, sub-THz
15Wi-Fi
IEEE 802.11 generations, the MAC, OFDMA in Wi-Fi 6 and MLO in Wi-Fi 7
16Short-range radio, Bluetooth and UWB
Bluetooth Classic and LE, UWB ranging, Zigbee, Thread, Matter and NFC
17LPWAN and IoT
LoRa and LoRaWAN, NB-IoT, LTE-M, Sigfox, duty cycles and battery life
18Satellite and non-terrestrial networks
GEO, MEO and LEO link geometry, Doppler, 3GPP NTN and direct-to-device
19Spectrum, security and regulation
Regulators, spectrum access models, RF exposure limits and wireless security
20Careers and industry
Wireless roles and skills, test and measurement, standards work and the market