Linked Questions

7 votes
1 answer
4k views

Location of Matched Filter

In a digital communication receiver, matched filter(SRRC filter) is used. In different literatures, the location of the matched filter is mentioned in two different places. One is just after the ADC ...
avi1987's user avatar
  • 181
6 votes
2 answers
3k views

Recovering signal for psk

I am currently working on a product (can't disclose too much details of the actual project) in which some data is being sent via audible (but on the higher freq) sound that is encoded with dqpsk. ...
Wong Shek Hei Felix's user avatar
1 vote
1 answer
819 views

PLL for Phase Demodulation and Carrier Tracking

I've been playing around with using a PLL for phase demodulation and it's working pretty well. The PLL locks to the carrier and the error term is the demodulated message signal. However, depending on ...
user67081's user avatar
  • 723
1 vote
1 answer
959 views

GNU Radio Low Pass Filter doesn't work as expected with different transition widths

I'm new to GNU Radio and signal processing. I don't know if the following is a simple question, but I have been scratching my head about it. I created a simple flow graph with a random source (0-3) ...
leonboe1's user avatar
  • 125
0 votes
1 answer
492 views

Signal Timing Recovery, Loop Bandwidth and SNR

As explained in the answer here, for the symbol timing recovery loop we need to keep loop bandwidth sufficiently below the modulation bandwidth of the signal so as to avoid the filtering of the signal ...
sarthak's user avatar
  • 303
0 votes
1 answer
540 views

Adaptive equalizer for BPSK signals with frequency offset

I'm trying to equalize a BPSK signal which has a residual frequency offset on it. This frequency offset is dealt with at a later stage in the DSP chain, along with phase estimation. I have ...
Philip's user avatar
  • 1
0 votes
1 answer
419 views

MATLAB: Generating a random bit stream in a frequency Band for PSK Modulation

I want to generate a pseudo-random bit stream in MATLAB in a given frequency band for PSK Modulation. I am using the idinput function to generate the bit stream: <...
sarthak's user avatar
  • 303
1 vote
3 answers
342 views

What is Self-noise in TED algorithm

I am working on a research project. The main task is timing error correction algorithm. I start with studying algorithms which are exist. Currently I have read about Gardner TED algorithm for PSK ...
LeeLeeYa's user avatar
0 votes
1 answer
273 views

Loop Bandwidth for Carrier Demodulation loop

I am trying to implement a simple MATLAB model for the demodulators for phase modulated signals (PSK) used in communication systems. For the detection of the phase modulated output (PM out in the ...
sarthak's user avatar
  • 303
0 votes
1 answer
247 views

How to perform a phase recovery for higher order modulation schemes

My objective is to demodulate the signals with different modulation orders and schemes. In particular, I want to recover the phase first. Let us say, my signal looks like in the constellation below . ...
Python's user avatar
  • 133
1 vote
1 answer
227 views

Timing recovery lock in receiver

I have done my receiver design with QPSK modulation. I am trying to communication between two systems at L band. My data rate is 1 Mbps. As my data rate is high I have allocated 64 bit for timing ...
mark's user avatar
  • 65
0 votes
0 answers
136 views

The timing offset remains after Gardner loop

I would like to use Gardner loop to remove the timing offset in order to demodulate the signal. My signal contains the frequency offset, however I know that the Gardner loop can handle substantial ...
Python's user avatar
  • 133
0 votes
1 answer
102 views

My preamble bits not enough for locking the timing recovery for a gaussian channel

I have chosen the preamble to be 48 bits (16 bits for carrier recovery+16 bits for timing recovery+ 16 bits for AGC of 30dB + 16 bits for phase ambiguity) As channel is gaussian and there is no much ...
Steve's user avatar
  • 59
-1 votes
1 answer
100 views

Carrier and timing offset

Assume my reference is 1 ppm so if my transmit frequency is 400 MHz and symbolrate is 100 kHz. Then, my carrier will have +/- 400 Hz offset and then my symbol will have +/-0.001 Hz offset. Similarly,...
nancy's user avatar
  • 55