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Category: Wireless/SDR

Wireless communications and Software Defined Radio (SDR)

Eye diagrams for I arm of a 4-QAM signal for 15, 30 and 45 degrees phase offsets and a Raised Cosine filter with excess bandwidth 0.5. A similar eye diagram exists for Q arm as well
December 23, 2016 Wireless/SDR

What is Carrier Phase Offset and How It Affects the Symbol Detection

In case of Quadrature Amplitude Modulation (QAM) and other passband modulation schemes, Rx has no information about carrier phase of

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For the same area and their spacing (with respect to the wavelength), the number of elements in the array at high band is larger thus capturing a similar or increased amount of power
December 20, 2021 Wireless/SDR

Free Space Propagation in mmWave Systems

In this article, we describe the free space propagation in mmWave systems. During the discussion, we dispel a common myth

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Phase jumps at every zero crossing from modulating data onto the carrier phase for a QPSK waveform
October 7, 2016 Wireless/SDR

The Fundamental Problem of Synchronization

We have seen in the effect of phase rotation that the matched filter outputs do not map back perfectly onto

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A general QAM detector with respective waveforms at each block
October 7, 2016 Wireless/SDR

Quadrature Amplitude Modulation (QAM)

We discussed earlier that Pulse Amplitude Modulation (PAM) transmits information through amplitude scaling of the pulse $p(nT_S)$ according to the

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A matched filter in continuous frequency domain along with the corresponding frequency matched filter for excess bandwidth 0.25
September 10, 2016 DSP / Wireless/SDR

Band Edge Filters for Carrier and Timing Synchronization

Band edge filters for carrier frequency and symbol timing synchronization is a very interesting topic that elegantly relates the tool

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5G Physical Layer - An Easy Guide to Key Technologies
Learn about 5G physical layer through great visualizations, simple maths and intuitive explanations

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