5G • RAN
pi/2-BPSK
pi/2-Binary Phase Shift Keying
Ultra-low PAPR modulation mapping 1 bit per symbol with 90-degree phase rotation, enhancing uplink cell-edge range.
Technical Explanation
When combined with DFT-s-OFDM, pi/2-BPSK rotates the constellation by 90 degrees (pi/2 radians) on consecutive symbols. This completely prevents the waveform from crossing through the origin, slashing the Peak-to-Average Power Ratio (PAPR) to near 0 dB and extending uplink reach by up to 3 dB.
Key Functions
- Slashing PAPR to near 0 dB when paired with DFT-s-OFDM
- Extends uplink cell-edge coverage by 2 to 3 dB
- Features specialized spectral shaping filter options in 3GPP
Specifications
3GPP TS 38.211
Interfaces
Uu
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