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Tag: Phase Locked Lop (PLL)

A discrete-time PLL with a PI loop filter and an NCO consisting of a phase accumulator and a Look-Up Table (LUT)
August 24, 2017 Wireless/SDR

Phase Locked Loop (PLL) in a Software Defined Radio (SDR)

IBM Watson and Google DeepMind are the most complex computers that, some believe, will try to run the world in

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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 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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An illustration of wiping off the modulation process without any training information
August 11, 2016 Wireless/SDR

Non-Data-Aided Carrier Phase Estimation

A carrier phase offset rotates the Rx constellation causing decision errors even in a perfectly noiseless environment. One of the

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A BPSK constellation in a the presence of a carrier phase offset. A hypothetical QPSK constellation is also shown for comparison
July 23, 2016 Wireless/SDR

How to Detect a Carrier Lock in an SDR

We have discussed before the effect of a phase offset on the received signal. We have also seen a logical

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