Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

question about modulation classification!

Status
Not open for further replies.

m_mir

Newbie level 6
Joined
Dec 17, 2004
Messages
13
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,281
Activity points
87
hello,

i need to recognize the modulation type of incoming signal in IF(intermediate band) .that is, i want recognize the modulation of signal is FSK or non FSK(such as PSK or QAM or ASK)?
how can i design this classifier?
remark:
the non FSK modulation have pulse shape.
i test several methods but all of them have problem and work in a special condition.
the methods have been tested : wavelet, zerocrossing, cumulant, ...
please help me.
 

atul_microwaves_antenna

Member level 5
Joined
Jul 6, 2007
Messages
80
Helped
7
Reputation
14
Reaction score
2
Trophy points
1,288
Activity points
1,848
Why don't you just detect the phase change ?
I mean...lets assume you know frequency of transmitted signal and assume all other necessary data...u know phase(freq shift) shift...
Do FFT with standard Cross-correlation method...
Wavelet thing is very suitable for Non-stationary signals...and here I am assuming that u are playing with stationary signal...
 

mahdithdn

Advanced Member level 4
Joined
Aug 18, 2004
Messages
107
Helped
27
Reputation
54
Reaction score
9
Trophy points
1,298
Location
Iran
Activity points
896
Hi,

As my experience Quasi-likelihood methods are exelent for MPSK modulation classification. there is the capability to classify also pi/4-shifted QPSK. It has some problems also, such as it needs a fine carrier frequency estimation and food timing recovery.

regards
 

    m_mir

    points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top