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# Coherent And Non Coherent

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coherent , non coherent , coherent fft , fsk coherent
21 Threads found on edaboard.com: Coherent And Non Coherent

## Power combiner for non-coherent signals

Er.. the whole point of combiners is to combine signals, that is, to add signals to the spectrum of those already there, so long as they are all within the operational passband of the combiner. They do not have to be related in any other way. There are uses for combiners where the inputs are deliberately coherent, though possibly p

## Soft Decision Decoding and Matlab

hi everyone, i'm working on a project related to Soft Decision Decoding of FH-MFSK in Matlab. the soft matrics (expressions) for non-coherent detection of MFSK have been derived. now the time is to implement these soft decisions in matlab to see the results. can anyone help me in how to implement this soft metrics in matlab for (...)

## Why is differential encoded signal is 3db inferior to normal signal?

All differential encoded signal are received using non coherent demodulation. Other normal signals are detected using coherent demodulation. My books says "The differential encoded signal has a larger BER compared to normal signals and it's inferior to it by an amount of 3db". Why is (...)

## help needed to solve some problems.

1. A digital communication system operating over an AWGN channel requires a probability of bit error (Pb) of 10^-3, find the required Eb/No (dB) for the following binary modulations: BPSK, BFSK, OOK, DPSK, non-coherent BFSK, and non-coherent OOK. Show computations. 2. (...)

## Analog communication........

Because the modulation index is the ratio between the DC value added to baseband signal and baseband minimum value. In DSBSC and SSBSC no DC value is added and no non-coherent detection is applied so the modulation index is not defined.

## Communication problem

You can check non-coherent systems.

## coherent and non-coherent addition- ICI cancellation technique

Hi ReComm, Let see this example: R1 = S + n1 R2 = S + n2 where S is the "useful signal" and n1, n2 are non-correlated noise contributions with zero mean and standard deviation sigma. The addition is R = R1 + R2 = 2*S + n1+n2 The total signal is 2*S and the total noise contribution is (...)

## FFT window, Quantization and Noise Floor

If you do not use "coherent sampling" you need to apply a window function to your signal before the fft, see below.nsignal=4096; fs=44100; f=1001*fs/nsignal; % coherent sampling i.e. integer number of cycles (1001) in nsignal samples %f=1000; %non-coherent sampling. Use hann (...)

## Regarding Differential PSK schemes

Here you go to start with I suggest you go through Xiong's book on Digital Modulation schemes. It may be available in the library of your university

## Coherent and Non Coherent Receiverin Frequency Hopping

can any body tell me why coherent receivers are not used in Frequency Hopping?

## need matlab code- time varying channel modulation, detection

i need matlab code for modulation and detection of time varying channel.. i need the code for interleaver,modulation using coherent bpsk,non coherent fsk,

also pay attention if spreading spectrum technique is used which requires non-coherent sync

## Non-coherent/Coherent integration

What is the non-coherent integration and coherent integration in the GPS receiver? Thanks so much for your help.

## What's coherent and non coherent modulation?

What's coherent and non coherent modulation?

## PN code noncoherent acquisition frequency offset problem

If I understand ur problem correctly .. U r trying to Acquire a PN code having some doppler (frequency offset) from base band. The best approach I can think is FFT acquisition technique if u r using DSP processor for acquisition . U take coherent data and then do non (...)

## What's the difference between coherent and non-coherent FSK demodulator?

what's the difference between coherent and non-coherent FSK demodulator?

## What's the difference between the coherent/non-coherent detection of orthogonal FSK ?

hello what is the difference between the coherent and non coherent detection of orthogonal FSK signals. i.e.: the minimum required frequency separation in coherent detection is 1/2T, where T is the symbol duration, to achieve the orthoganality. at the same (...)

## FSK demoudulator using a PLL and data slicer is cohereent ?

We using FM PLL demodulator with a data slicer as FSK demodulator, my question is what is it a coherent demodulator or non-coherent demodulator? and FSK demodulator has two another method: 1: general band pass filter and envelope comparator 2: match (...)

## 8-DPSK BER and Viterbi

Hello, I've been trying to apply Viterbi to 8-DPSK and I do not find an enormous amount of references, not even about how much I could gain in performance compared to a ususal non-coherent receiver... would anyone know where to point me to? Thanks in advance, ;)

## coherent and non-coherent transmission

Hi all of u, I've had some trouble with the concepts : coherent and non-coherent transmission in digital transmission system, and what is difference between them. Anyone know can explain it to me. Thanks a lot