May 20, 2017 · I am trying to analyze whats the major difference between these three variants of 4PSK. I know that QPSK - signal points are at 0,90,180,270 OQPSK - The bit period of Quadrature …

Dec 8, 2021 · I agree the higher order modulations above QPSK require better phase noise for same performance but don’t think that is the case with BPSK vs QPSK for the same arguments made with …

Sep 15, 2023 · I'm curious about the reasons behind this choice of modulation schemes. Why is QPSK preferred for multi-tone transmission in NB-IoT, especially considering that π/4-QPSK is used for …

Dec 27, 2016 · There are different types of QPSK: Offset (staggerd) QPSK, $\pi/4$-QPSK, etc. In its most known form, QPSK is identical to $4$-QAM or $4$-PSK. That is, the same constellation can be …

Sep 18, 2020 · The blue piecewise constant graph under a Pulse Shaping header resembles a 4-PAM signal waveform, if anything, and certainly does not represent a sample of 16QAM waveform. Neither …

Jan 24, 2014 · In QPSK, after splitting the odd and even bits into the I and Q channels, and then multiplying them with the sine and cosine function, what next am I suppose to do? Do I rearrange …

Feb 8, 2021 · From what I've read, the spectral properties of the modulation largely depend on the rate of change of the signal phase - "a signal in which the phase changes stepwise has a broad …

I'm simulating a QPSK system in Matlab and I'm trying to calculate the theoretical bit error rate to compare it with the simulated ber. The formula that I'm aware of involves the term Eb/N0, but how do …

May 13, 2018 · What is the difference between a $\\pi/4$-QPSK modulation and a QPSK differential modulation (DQPSK)? Are these modulations identical?

I conducted a research on how to implement a QPSK demodulator. I found out the Quadrature QPSK demodulation technique which seems very straight forward. Here is what i understood from the …