Questions tagged [symbol-timing]
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52 questions
0 votes
1 answer
32 views
OFDM timing algorithm in FPGA
What algorithm is typically used for OFDM (4G/5G) timing recovery in FPGA implementation?
- 1
0 votes
1 answer
62 views
Circuit symbol timing algorithm
Sorry I am new to FPGA symbol timing recovery. Let's say I have a perfect channel (small AWGN noise is the only problem). The modulation format is BPSK, and the pulse shaping is square/rectangular ...
- 55
1 vote
1 answer
155 views
Symbol Timing Synchronization
I knew there are several posts regarding a similar topic, however I would still ask the question to make sure I understand the symbol timing offset (STO) correctly. For instance, if a modem claimed to ...
- 33
0 votes
1 answer
61 views
Gardner symbol sync is not working (GNU-Radio)
I have to demodulate signal, modulate as a test signal in this way: ...
0 votes
1 answer
71 views
symbol duration vs data rate in wifi 5 vs wifi 6
I have a question reg below statement: In Wi-Fi, symbol duration refers to the time it takes to transmit one symbol, which is a unit of data transmission, and it's a key factor in data rates and ...
0 votes
1 answer
74 views
Effect of high SPS under low SNR
I want to ask a question about symbol synchronization in demodulation process. As far as I understand, symbol synchronization block consists of three main components: time error detector, interpolator ...
- 124
0 votes
1 answer
415 views
FM0 (bi-phase space) decoder
I'm looking for the solution for decoding FM0 (bi-phase space) encoded signal from RFID tag. Response from the tag starts with preamble and then followed by 16 bit random number. Link rate is 40kHz. ...
- 11
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
1 vote
0 answers
153 views
Understanding the (complex) GNU Radio implementation of Mueller & Muller
I have some questions about the M&M implementation of GNU Radio that uses complex samples. I started reading the implementation for real values: ...
- 11
0 votes
1 answer
254 views
Symbol Sync blocks in GNU Radio seem to use PID (well, PI) for their clock sync feedback loops. Why not IIR/FIR?
E.g. the Symbol Sync block has a Loop Bandwidth, which (if I read the source right) ends up as a PI loop. I know what PID does mathematically, and what FIR and IIR ...
- 115
1 vote
3 answers
281 views
GRC implementation for IQ data acquisition of 2-GFSK Radio
I am trying to design a 2-GFSK receiver for acquiring IQ symbols. The aim is to implement the entire receiver chain but the decision stage. The 2-GFSK waveform is being generated by a standard IoT ...
- 27
0 votes
1 answer
190 views
How to choose sample offset values in timing synchronization for a QPSK demodulator?
I am implementing a timing synchronization loop for a QPSK demodulator. I have chosen to use a Gardner timing error detector, which has often been mentioned. I am about to close my loop and I am ...
- 31
2 votes
0 answers
200 views
MFSK symbol synchronization
I am working on a simple MFSK modem for use on the HF band. I'm having trouble recovering the symbol timing information from the stream. With 2-FSK it's easy - just subtract one frequency from the ...
- 23
0 votes
0 answers
170 views
Biphase/Manchester floating-point decoder based on matched filter
I need to perform soft Viterbi decoding on a Manchester-encoded BPSK/QPSK signals. To that end, I need a floating point Manchester decoder. Most of the implementations I have seen operate on hard bits....
0 votes
1 answer
327 views
oQPSK symbol synchronization
I'm validating a C++ oQPSK receiver. The 5Mbps oQPSK signal is generated by a satellite emulator. The receiver structure goes as follows: SDR --> AGC --> Costa's Loop --> Delay --> ...