QPSK Archives - GaussianWaves

π/2 BPSK (pi/2 BPSK): 5G NR PHY modulation

Mathuranathan — Mon, 07 Feb 2022 03:36:47 +0000

The 5G New Radio (NR) supports quadrature phase shift keying (QPSK), 16- quadrature amplitude modulation (16-QAM), 64 QAM and 256 QAM modulation schemes for both uplink and downlink [1][2]. This is same as in LTE. Additionally, 5G NR supports π/2-BPSK in uplink (to be combined with OFDM with CP or DFT-s OFDM with CP)[1][2]. Utilization ... Read more

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Rician flat-fading channel – simulation

Mathuranathan — Sat, 15 Aug 2020 13:54:24 +0000

In wireless environments, transmitted signal may be subjected to multiple scatterings before arriving at the receiver. This gives rise to random fluctuations in the received signal and this phenomenon is called fading. The scattered version of the signal is designated as non line of sight (NLOS) component. If the number of NLOS components are sufficiently ... Read more

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Constellation diagram – investigate phase transitions

Mathuranathan — Sun, 28 Jun 2020 12:15:57 +0000

The phase transition properties of the different variants of QPSK schemes and MSK, are easily investigated using constellation diagram. Let’s demonstrate how to plot the signal space constellations, for the various modulations used in the transmitter. Typically, in practical applications, the baseband modulated waveforms are passed through a pulse shaping filter for combating the phenomenon ... Read more

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Symbol Timing Recovery for QPSK (digital modulations)

Mathuranathan — Mon, 18 Nov 2013 08:29:30 +0000

The goal of timing recovery is to estimate and correct the sampling instants and phase at the receiver, such that it allows the receiver to decode the transmitted symbols reliably. What is Symbol timing Recovery : When transmitting data across a communication system, three things are important: frequency of transmission, phase information and the symbol ... Read more

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QPSK – Quadrature Phase Shift Keying

Mathuranathan — Tue, 19 Oct 2010 08:20:00 +0000

Quadrature Phase Shift Keying (QPSK) is a form of phase modulation technique, in which two information bits (combined as one symbol) are modulated at once, selecting one of the four possible carrier phase shift states. The QPSK signal within a symbol duration \(T_{sym}\) is defined as where the signal phase is given by Therefore, the ... Read more

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