![]() ![]() ![]() This modulation technique is the most robust of all PSKs since it takes the highest level of noise or distortion to make the demodulator reach an incorrect decision. In the quadrature phase-shift keying (QPSK) scheme, two bits are grouped Example of BPSK modulation is shown in Figure 2. −Bandwidth efficient but power inefficient −Example: ASK, QPSK ¾Nonlinear modulation: the amplitude of the transmitted signal, s(t), does not vary linearly with the modulating This paper presents a new practical QPSK receiver that uses digitized samples of incoming QPSK analog signal to determine the phase of the QPSK symbol. For Offset QPSK, when the Half Sine Filter is selected, the OQPSK reference constellation points fall on a circle with a magnitude of sqrt(2)/2, but the EVM is still expressed as a percentage of the carrier. This assumes that the subframe does not carry PBCH, PSS, SSS. Qpsk modulation example The BER of QPSK scheme over AWGN & Rayleigh fading channel. ![]()
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