Questions tagged [synchronization]
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119 questions
0 votes
1 answer
15 views
The flow of frames in a full synchronization chain in digital receivers
I have a full synchronization chain in a digital receiver that consists of: Coarse frequency synchronization: this is a blind balanced quadricorrelator Frame synchronization: this is data-aided ...
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0 votes
1 answer
46 views
Constellation scattering when receiver is frequency-wise desync
I've used BPSK for this experiment. I've noticed that when the receiver is desynchronized in frequency with $\delta f=0.5T^{-1}$ (such that $T$ is the sampling period of the emitted signal), received ...
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1 vote
3 answers
129 views
Preventing cycle slips in PLL design
I am trying to build an all-digital PLL for carrier synchronization on an FPGA. Once my local oscillator is locked onto the carrier of the incoming signal (MSK modulation), it still suffers from ...
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0 votes
1 answer
146 views
Sampling frequency in digital communication with higher order modulation (QPSK, APSK)
Is it necessary to use a sampling frequency higher than the Nyquist frequency in digital communication? In general, it is known that to receive a signal with bandwidth $B$ the sampling frequency equal ...
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0 answers
54 views
What is the best way to sync I/O audio streams to mix them in real-time?
I want to mix loopback stream with audio from microphone in real-time and use the result of mixing for speech recognition. The project is for Windows, so I use WASAPI and am willing to know what is ...
- 1
0 votes
1 answer
108 views
Why do I have to increase the delay periodically while trying to synchronize two streams at the receiver?
I am trying to synchronize two streams at the receiver in GNU Radio. You can see in the Picture below that I subtract the receiver signal from the signal that has been demodulated and modulated again. ...
0 votes
0 answers
88 views
Issue with small signal ML TED with low RRC excess bandwidth
I have a simple BPSK system using RRC TX & RX filters with 10% excess bandwidth with a receiver that uses a symbol synchronizer of the common type consisting of a polyphase filter bank (performing ...
- 753
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154 views
Can PLL for OQPSK be used for carrier frequency recovery?
This is the phase detector of PLL of OQPSK modulation. Apparently, it introduces a self-noise labeled in red which can’t be offset. I simulate this algorithm in Matlab, it doesn’t perform as well as ...
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