QPSK


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QPSK

QPSK

(Quadrature Phase Shift Keying) A phase modulation technique that transmits two bits in four modulation states. See PSK, phase modulation and QAM.
References in periodicals archive ?
Symbols with index 1 (squares) are symbols of QPSK 1, symbols with index 2 (crosses) are symbols of QPSK 2 and final 8PSK symbols (asterisks) are represented by two letters with relevant subscripts.
By maintaining only first two terms in (7) and (8) for BPSK and QPSK detection, respectively, and using (9), one can get simple expressions, which lead to infinitive series-form evaluation of BER performance for wide range of propagation scenarios.
The PSO-200 provides multiple ways to view and analyze random or repetitive signals including constellation and eye diagrams and new modulation schemes such as QPSK, mQAM, DQPSK, and dual polarization transmission.
TABLE I MODULATION AND CODING COMBINATIONS Coded RS CC Overall Payload Uncoded Blocks Modulation Code Code Coding (Bytes) Blocks (Bytes) (Bytes) BPSK (12,12,0) 1/2 1/2 11 12 24 QPSK (32,24,4) 2/3 1/2 23 24 48 QPSK (40,36,2) 5/6 3/4 35 36 48 16QAM (64,48,8) 2/3 1/2 47 48 96 16QAM (80,72,4) 5/6 3/4 71 72 96 64QAM (108,96,6) 3/4 2/3 95 96 144 64QAM (120,108,6) 5/6 3/4 107 108 144
The QPSK EVM actually compares the measured filtered samples with the filtered samples for an ideal QPSK reference.
Closed-form expressions for FOBP for classical BPSK, QPSK and MSK modulation have been derived and compared to PSD calculations to verify their accuracy.
As an example a QPSK digital modulator in a wireless network is discussed.
Other applications for these devices are phase comparators, QPSK demodulators and linear vector modulators.
To achieve a wideband linear QPSK modulator in the 1 to 2.
50 MHz / downlink polarization: vertical / transponder transmission rate: 22 MB/s QPSK FEC 5/6; Service name: ASTRA VISION 3
The Hitachi Kokusai 24GHz unlicensed band Broadband Wireless Point to Point (P-P) system enables in-service wireless Ethernet with innovative adaptive modulation from QPSK, 16QAM to 64QAM, up to 150 Mbps air data rates TDD Point to Point.