5G • RAN
QPSK
Quadrature Phase Shift Keying
Robust modulation scheme mapping 2 bits per symbol, used for control channels and cell-edge conditions.
Technical Explanation
QPSK maps pairs of bits into four distinct phase constellation points. It provides high resilience against low signal-to-noise ratios (SINR), making it the universal modulation for PDCCH, PUCCH, PBCH, and cell-edge PDSCH/PUSCH data transmissions.
Key Functions
- Maps 2 coded bits per complex modulation symbol
- Serves as baseline modulation for all 5G control channels
- Maintains connectivity under harsh negative SINR conditions
Specifications
3GPP TS 38.211
Interfaces
Uu
Related 5G Concepts
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