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Wireless & Mobility · Intermediate

Quadrature Phase Shift Keying (QPSK)

PSK using four phase states to carry 2 bits per symbol.

Definition

QPSK doubles BPSK's bits per symbol while remaining robust. It is used for 802.11 OFDM rates 12 and 18 Mbps and MCS 1 and 2. LTE and 5G also use QPSK for robust channels.

Exam tip

QPSK = 2 bits per symbol.

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