110 Threads found on edaboard.com: Ask Demodulation
What do you mean by "the modulation should be decoded according to the used standard"?
The signal is more or less a filtered (lowpass + highpass) ask-signal (which uses FM0 code as specified in the UHF-RFID-standard DIN 18000-6b btw, if that's of interest). It just uses two amplitudes, A and -A, which is why I so far used the zero
Digital Signal Processing :: 28.05.2008 20:24 :: parra :: Replies: 5 :: Views: 2830
I am trying to implement an Amplitude shift Keying ask modulation and (synchronous)demodulation in Matlab,I have to use a PLL at the receiver end for demodulation.The task is to read a hexadecimal file (attached) and convert it to a binary stream. the binary stream is the modulated with a carrier frequency of (...)
Digital Signal Processing :: 18.12.2011 14:31 :: ultraviolet_ray :: Replies: 0 :: Views: 765
How to program a VHDL to implement demodulation of AM, FM, PM, PSK, QPSK, PCM, FSK, ask, CDMA.. on FPGA (Xilinx)
could anybody give me some advice, CORDIC or some other algorithms are appreciate,
thx in advance.
PLD, SPLD, GAL, CPLD, FPGA Design :: 21.02.2003 16:41 :: goodguy1 :: Replies: 2 :: Views: 3032
i want implantable RF transceiver. Min freq is 400MHz . its should be low power.Modulation type for Rx-ask and Tx-FSK is preferable .....
Can anyone suggest some vendors? I need it ASAP.
Thanks in advance
RF, Microwave, Antennas and Optics :: 12.06.2003 09:39 :: niks :: Replies: 8 :: Views: 1451
I have a couple of Wenshing Rx/Tx modules for data communication, working in the 433Mhz band.
Wenshing datasheets say they're ask modulation, but I think they may specifically be OOK (no carrier during tranmission of zero)
Due to low-power requirements I need the transmitter module to be off the most of the time, but the problem arises when t
RF, Microwave, Antennas and Optics :: 14.12.2004 15:26 :: Regnum :: Replies: 6 :: Views: 1970
I want to ask a question about the subject. Can we implement such a demodulation with DSPs? Is there a DSP card for this application (TI or Motorola)? I want to learn whether such a demodulation can be implemented on a DSP using simulink automatic code generation tool.
Digital Signal Processing :: 10.10.2005 10:01 :: emrek :: Replies: 4 :: Views: 1410
Most use a load pull method to make ask as seen from the reader side. It is possible that the ask tone is changed in frequency or phase to produce a modulated subcarrier. I suspect that this is rarely done.
Electronic Elementary Questions :: 26.11.2006 15:42 :: flatulent :: Replies: 2 :: Views: 599
this type of code is hard to find, because the code generally is proprietary.
Does any one have a working Verilog code/ algorithm for envelope detection, phase discriminator and/or frequency discriminator? I already have a working code for demodulation of ask and FSK but i dont think they'd work for their analog counterpart. Tha
PLD, SPLD, GAL, CPLD, FPGA Design :: 14.06.2007 15:25 :: funster :: Replies: 2 :: Views: 1447
I have this Rf transmitter & receiver which uses ask modulation. A comparator is connected to the receiver. My problem is that the resistor in the comparator is unstable and as a result a potentiometer is needed in order to receive the signal coming out of the transmitter. Does anybody has a solution for this? I don't want to use a potentiometer in
RF, Microwave, Antennas and Optics :: 25.02.2009 19:12 :: headman333 :: Replies: 8 :: Views: 933
Can anyone help me with modulation and demodulation of Bask with addition of noise and checking of error due to noise........
Please help me ASAP.... next 2 days......
Digital communication :: 15.05.2009 02:49 :: vishalsratti :: Replies: 9 :: Views: 10405
Look at this simulink(matlab 7.0 or later) model:
and ask questions...
Digital Signal Processing :: 10.10.2009 13:00 :: ux :: Replies: 1 :: Views: 1674
disp('M-Array ask Modulation')
%create a random digital message
M=input ('M= '); %alphabet size
x=randint(input('Number of binary bit stream = '),1,M);
nsample=40; %oversampling rate.
%use M-ask modulation to produce y
%follow with rectangular pulse shaping.
Digital communication :: 30.12.2009 16:00 :: Aya2002 :: Replies: 5 :: Views: 8885
Hm, I think it depends. Are you trying to extract an analog audio signal from the wav files, or is it actually digital data modulated with ask or FSK?
Digital communication :: 22.03.2010 13:07 :: cdh7 :: Replies: 2 :: Views: 1339
What exactly are you trying to do?
certainly, a basic FFT will be able to demod low-rate signals. especially low-rate ask/FSK signals, and even some PSK ones.
but without timing/carrier recovery, or equalization, you will eventually run into limits.
Electronic Elementary Questions :: 01.08.2010 08:19 :: permute :: Replies: 1 :: Views: 871
Digital communication :: 06.08.2010 09:47 :: Ahmed Alaa :: Replies: 1 :: Views: 2590
I'm not sure if they use multipliers. Do you have references for squarer stages used with ask demodulation?
Analog Circuit Design :: 29.12.2010 10:44 :: FvM :: Replies: 4 :: Views: 490
I am studying how bad is demodulation in case of not having a real match filter as the first block in the reception of the signal. do you know where could I find curves which take into account this error in the filter?? The only curve I found is the teoretical one and I guess, its behaviour is not the same
Thanks in advance!!
Digital communication :: 23.01.2011 15:09 :: Xavipersonal :: Replies: 0 :: Views: 820
Im also beating with the head to demodulate a tag with the same U2270B... but in my case I now for sure that the reader is working fine.
When I read the I/O of the u2270b with a LA I also get surprised with the same... see this print screen with no tag
and with tag:
RF, Microwave, Antennas and Optics :: 29.07.2011 17:45 :: abukede :: Replies: 3 :: Views: 803
I have written a matlab code for ask modulation and demodulation. I have taken 1 bit at a time, modulated tat bit, added noise to it and demodulated that bit to recover the original data bit. I need to modify this code for all the bits present in the data sequence.... I have to repeat the above steps for 10 bits... How to do tat.. kindly
Digital communication :: 03.02.2012 08:24 :: Shruti01 :: Replies: 2 :: Views: 932
Spectrum lab is excellent!
I can see there is a plugin to demodulate I/Q. I have not used it extensively but I hope you could connect directly the outputs of an image reject mixer to the stereo input of a PC soundcard to recover and filter the audio.
I would like to ask you if there is any plugin for the inverse process, i.e to create an audio
RF, Microwave, Antennas and Optics :: 17.03.2012 10:50 :: neazoi :: Replies: 0 :: Views: 427
I need an ask modulator circuit using 555 timer IC and analog switch (transistor based), also need a demodulator for the same..
pls help me..
Microcontrollers :: 02.08.2012 14:51 :: maximus332 :: Replies: 4 :: Views: 363
I'm intersetd to find out more about the demodulation of noisy Amplitude Shift Keying (ask) modulated signal.
If I have singal that is modulated using ask and I'm sending it over the channel with very high white noise (making the SNR at the receiver very low ~ 0dB), how should I perform demodulation? I'm learning (...)
Digital communication :: 25.01.2013 18:27 :: stani :: Replies: 1 :: Views: 124
I have to tune receiver for radio control aircraft , freq: 72mhzFM.
2. Then after demodulation i should tune for max output or after IF stage i should do that .
3. the signal i am receiving is PWM so i canot adjust sine wave.
4. How to detect if ceramic filter is working alright because many times after crash of model the filt
RF, Microwave, Antennas and Optics :: 06.06.2003 00:07 :: E-design :: Replies: 6 :: Views: 2370
I heard that people in Japan and USA can utilize the signal sent out by observatories so as to calibrate their clock or watch. I wonder if it is really the case? I just know the signal is in ask format. Anyone have the details of the signal? Frequency, power......etc. Also, any suggestion on the demodulation circuits?
RF, Microwave, Antennas and Optics :: 11.03.2003 17:16 :: mesfet :: Replies: 6 :: Views: 1112
Here you are..
title - "RF-Communication Circuits"
chapter title - "Modulation"
Author - Jens Vidkj?r
Class Notes, 48260 RF-Communication, Spring 2001
I Modulation, Transmission, and demodulation ........................... 1
I-1 Basic Modulation Types and Concepts ......................... 2
Amplitude Modulations, AM
RF, Microwave, Antennas and Optics :: 06.06.2003 20:00 :: marcomdd :: Replies: 4 :: Views: 1481
Thermocouples only introduce additional error due to cold junctions.
The PT100 is platinum resistance thermometer (RTD), so don't require for a cold junction compensator.
How achieve high accuracy temperature measurements is not then an easy matter, however some su
Professional Hardware and Electronics Design :: 28.09.2003 00:33 :: james :: Replies: 17 :: Views: 4727
Hi, sorry if I'm so insolent, but I also need this codes for voice recognition. My task is just for 3 different words. So when I say one of them the program should define and write it.
Could someone be so kind and send such a code to my mail - firstname.lastname@example.org
Digital Signal Processing :: 10.05.2010 15:20 :: Arcadia :: Replies: 100 :: Views: 38314
The most efficient amplifier for 13.56 MHz is a Class E amplifier.
I think you only need to transmit ask.
For example you can use the IRF510/IRL510 transistor for that and easily get up to and more than 20W at 13.56 MHz.
There are many reference designs for that amplifier.
For example just search for Microchip MCRF45X REFERENCE DES
RF, Microwave, Antennas and Optics :: 14.05.2006 23:30 :: harkonnen :: Replies: 8 :: Views: 2276
do not invent the wheel again
use ADC + Isolation products from and
they have 4 channel isolators in a chip that is small and low cost.
They used the two different magnetic technology ,you can also use some single channel opto with logic output that works up to 1mbps,but nve works ap to 30mbps
I hate to us
Professional Hardware and Electronics Design :: 01.06.2004 11:32 :: 7rots51 :: Replies: 29 :: Views: 7591
very pleased to get your help! After i read these papers,i will ask for your advices.
Also, please take a look at these two papers from Q. Huang.
Analog IC Design and Layout :: 26.06.2004 14:31 :: legend :: Replies: 21 :: Views: 5199
Sorry, forgot to ask
Is your idea to use the data in the digital domain?
or do you just want PC controlled receiver, or have it stand alone with pic to use on a CVBS monitor?
Professional Hardware and Electronics Design :: 07.07.2004 22:44 :: Frosty :: Replies: 10 :: Views: 5977
thank you guys for your help .
I just want to ask whether the new modem (if implemented using FPGA) would be smaller in size or I will end up with the same size of what is existing in the market or even larger .
thanks again ,
PLD, SPLD, GAL, CPLD, FPGA Design :: 09.10.2004 19:40 :: jaz396 :: Replies: 6 :: Views: 898
I just begin to design a RF product which runs on 433MHz. The transmitter is made by a SAW resonator in ask mode. The transmitter is normally in sleep mode and need a signal to wake up it. The wake up signal is in 433Mhz lasted for about 10ms(always in "1" level) and sent by an interrogator 15 meters away. The output power of the
RF, Microwave, Antennas and Optics :: 12.11.2004 05:59 :: HeiFelix :: Replies: 10 :: Views: 2584
What's actually you want to ask?
Electronic Elementary Questions :: 25.04.2005 03:25 :: hill :: Replies: 5 :: Views: 1262
Perhaps you heard about Software Defined Radio, or SDR, which suggests that use digital devices in radio facilities as much as possible. But you still have to design some analog parts: RF front-end, and baseband signal amplifer.
i agree with Whizkid's opinino.Analog demodul
PLD, SPLD, GAL, CPLD, FPGA Design :: 30.05.2005 16:43 :: cevitamic :: Replies: 24 :: Views: 6101
You can ask for the problem in with the program code and the error message. So that we can learn whether it is a bug or not. Sometimes matlab gives suspicious (even mystic) errors or warnings. For example after running a simulink model when you look at the matlab window you can see lots of warnings many of which you can
Software Problems, Hints and Reviews :: 27.07.2005 15:13 :: emrek :: Replies: 5 :: Views: 3926
if his bit rate it too high this pulsed after passing through LPF stage demodulation>of an FM reciver will widen the pulse and he will be unable to receive wot he tranmitted coz of pulse widing.
i was trying same using printer port, but in ask.
i am not good at electronics but trying to help
i can be wrong. if i am point then do
Analog Circuit Design :: 04.10.2005 19:35 :: coldnuke :: Replies: 11 :: Views: 1489
you may follow many concepts, i.e. minimize the number of instruments.
To measure spar, you need a VNA, but ask yourself are spar really needed, or |s11| and |s21| are enough? In the latter case a more economical SNA may be used instead.
Ehh... for usable using of S11 and S21 (in simulator etc.) you ne
RF, Microwave, Antennas and Optics :: 12.11.2005 14:51 :: xxargs :: Replies: 4 :: Views: 1233
Hi evrey member,
I ask if someone have a code matlab for WCDMA with smart antenna. when I hope simulate the encoded channel with et impulse response of channel multi-users and the location of direction of arrival.
thank you for your help
Added after 12 minutes:
my @ mail is
Digital communication :: 19.06.2009 13:26 :: karim98 :: Replies: 54 :: Views: 20084
using LED like using omni direction antenna but laser like directed one
if u want to concentrate ur power into a small area use laser but if u want to distribute the power use led it depend on the application u will implement but if u ask about the theory of operation u will find alot of document on the net talk about that sorry i do not have one
RF, Microwave, Antennas and Optics :: 26.03.2006 20:47 :: eng_islam :: Replies: 7 :: Views: 1197
check ti ISM band tarnsivers , these IC's very good , have FSK , ask modulation and demodulation , and controller via a micrcontrollers
RF, Microwave, Antennas and Optics :: 10.04.2006 00:00 :: khouly :: Replies: 2 :: Views: 993
Like as at varicap diodes, when tuning voltage is increased diode capacitance decreases. Here are used three transistors to increase total variable capacitance.
Transistor you are asking for is for temperature compensation of oscillator (middle transistor).
RF, Microwave, Antennas and Optics :: 29.04.2006 20:58 :: Borber :: Replies: 17 :: Views: 1793
Hi, I would go for an Analog devices device ADF7020 series. Cheap (1.50 USD @ 100 pcs) very few external components (should have a look) and easy to use. Complete digital radio technology with digital filtering and demodulation. Can do FSK/GFSK/GMSK, OOK, ask, GOOK etc....
I would select frequency hopping since ihis is th
RF, Microwave, Antennas and Optics :: 10.05.2006 18:49 :: PaulHolland :: Replies: 22 :: Views: 1488
Plz specify your question clear becuase I/Q downconversion has some different schematics.
But i think u ask about image filter rejection for rejecting high frequency cosine term, isnt it?
If it is true then u cant filter both line(I/Q) with just 1 filter because of separate processing of I and Q channel or interpretation of these line as comp
Digital Signal Processing :: 02.06.2006 11:54 :: m_llaa :: Replies: 7 :: Views: 1216
i am doing FSK modulation for data transmission thru power line
so please suggest me how it would be possible and also provide the available IC'sTry with
Next time ask google first...
Service Manuals, Requests, Repair Tips :: 19.08.2006 15:23 :: sinip :: Replies: 3 :: Views: 1271
Hey friends.. I need Matlab code for digital modulation techniques... like ask, PSK, BPSK, DPSK, QAM, QPSK, etc... If you have that, Please post that...
Advance tnxs to you
Digital communication :: 06.09.2006 20:38 :: Raghuvij :: Replies: 24 :: Views: 19750
For realization of your idea you must cascade FM modulator and AM modulator after it. To get undistorted FM signal after FM demodulation the modulation depth of AM must be lower than 90%. Simple ask can not be used.
RF, Microwave, Antennas and Optics :: 26.10.2006 19:22 :: Borber :: Replies: 19 :: Views: 956
GMSK is a constant amplitude signal while the data is loaded on the phase of the signal so any variation in the amplitude of the signal will not affect the information in the signal as the information is exctracted from the phase of the signal. Non-linear PA will only affect the Amplitude Modulation signal such as ask or whatever.
Digital communication :: 04.12.2006 22:51 :: Haytham-Sief :: Replies: 16 :: Views: 1831
you WANT an ofdm report to submit and you also WANT wcdma simulation. Why don't you start working on it YOURSELF and then ask others to help. No one would GIVE you his/her work... no one!
Unless they copied it themselves, of course!
Secondly, I quote "i need wcdma matlab simulation or any kind of wcdma simulation"
You're not even sure what
Digital communication :: 03.09.2009 11:48 :: Communications_Engineer :: Replies: 10 :: Views: 3580
I would ask what's the dynamic range of a transceiver and how it's related with the design of each block
RF, Microwave, Antennas and Optics :: 22.01.2007 04:27 :: sapphire :: Replies: 22 :: Views: 2116