39 Threads found on edaboard.com: Ask Demodulation
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 08:31 :: ultraviolet_ray :: Replies: 0 :: Views: 1185
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 10:41 :: goodguy1 :: Replies: 2 :: Views: 3770
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 09:26 :: Regnum :: Replies: 6 :: Views: 2456
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 04:01 :: emrek :: Replies: 4 :: Views: 1692
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 09:42 :: flatulent :: Replies: 2 :: Views: 739
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. Thanks.
PLD, SPLD, GAL, CPLD, FPGA Design :: 14.06.2007 06:31 :: reyge :: Replies: 2 :: Views: 2053
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 14:24 :: parra :: Replies: 5 :: Views: 3205
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 :: 14.05.2009 20:49 :: vishalsratti :: Replies: 9 :: Views: 11662
Look at this simulink(matlab 7.0 or later) model:
and ask questions...
Digital Signal Processing :: 10.10.2009 07:00 :: ux :: Replies: 1 :: Views: 2088
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 10:00 :: Aya2002 :: Replies: 5 :: Views: 11659
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 08:07 :: cdh7 :: Replies: 2 :: Views: 1735
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 02:19 :: permute :: Replies: 1 :: Views: 1155
Digital communication :: 06.08.2010 03:47 :: Ahmed Alaa :: Replies: 1 :: Views: 3385
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 04:44 :: FvM :: Replies: 4 :: Views: 604
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 09:09 :: Xavipersonal :: Replies: 0 :: Views: 1127
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 02:24 :: Shruti01 :: Replies: 2 :: Views: 1624
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 05:50 :: neazoi :: Replies: 0 :: Views: 1033
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 08:51 :: maximus332 :: Replies: 4 :: Views: 617
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 12:27 :: stani :: Replies: 1 :: Views: 256
The waveform descriptions are apparently referring to previous threads
Apart from the many unclear points in your post, the circuit is at best forming an envelope detector, but it's missing the decision circuit required for an ask demodulator.
If the mod
Analog IC Design and Layout :: 20.08.2013 12:06 :: FvM :: Replies: 4 :: Views: 294
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 11:16 :: mesfet :: Replies: 6 :: Views: 1217
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 :: 09.04.2006 18:00 :: khouly :: Replies: 2 :: Views: 1177
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 12:49 :: PaulHolland :: Replies: 22 :: Views: 1663
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 09:23 :: sinip :: Replies: 3 :: Views: 1533
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 13:22 :: Borber :: Replies: 19 :: Views: 1137
Please kindly help me think (predict) a few questions regarding transceiver (GSM/WCDMA) that interviewer could ask.
This position is an Application Engineer so they won't ask IC process question.
Could you please proivde must-know questions with transceiver ?
Such like "what is DC-Offset" , "What is (dis)advantage of Zero-IF architecture"..
RF, Microwave, Antennas and Optics :: 22.12.2006 07:10 :: passerby :: Replies: 22 :: Views: 2537
HI ..this brings old memories ...well.the only way possible is to use an old ISA (8 bits ) floppy controller ..beacuse the floppy drive only outputs MFM format data ,to get binary code ,that requires complicated demodulation that is done in the floppy controller other words the floppy controller is not just a bunch of registers to hook to the I
Microcontrollers :: 02.03.2007 02:29 :: eltonjohn :: Replies: 4 :: Views: 900
its not that i am asking u ppl to spoon feed.i m sorry if i gave that impression.i just needed some basics.sorry again
RF, Microwave, Antennas and Optics :: 01.11.2007 02:19 :: nidahas :: Replies: 7 :: Views: 2159
you need an ieee paper or just a tutorial?
if ieee make a search and choose the one you need to get help.
Else just ask
RF, Microwave, Antennas and Optics :: 31.10.2007 08:57 :: pouchito :: Replies: 5 :: Views: 517
this is simple examples for ask MOODULATION i will upload alot of tutorial about digital modulation
Electromagnetic Design and Simulation :: 09.01.2008 13:51 :: khald_1980 :: Replies: 6 :: Views: 3726
Please see details at
Feel free to ask any question
? we will respond in 12 h or sooner (depending on a time zone shift).
EDA Jobs :: 03.04.2008 10:05 :: FreelanceT :: Replies: 2 :: Views: 953
In UHF RFID 3 modulation types are used from reader to tag:
For SSB a carrier is added, but what about DSB-ask. When a continuous wave is ask modulated, two sidebands are created. Is the carrier suppressed in this way, since only the two sidebands remain.
And what (...)
RF, Microwave, Antennas and Optics :: 01.04.2009 09:56 :: jancambodia :: Replies: 1 :: Views: 1154
receiver cannot tell BER unless it knows what was transmitted before-hand, maybe a training sequence that is known by both transmitter and receiver.
In general (without training sequence/pre-stored data), only external equipment can do general BER estimation, since the same equipment sends the data and it reads back the received data and makes a
Digital communication :: 17.10.2009 04:10 :: Gemini1706 :: Replies: 2 :: Views: 713
i am using a bias t.the out put is rf+dc+_ook signal. i want to convert ook signal to RS 485.Still I can't understand what you want to do.
Even if you use Bias-Tee, you can not create OOK(ask) signal.
Use industrial standard and correct terminologies.
What you want to do is a demodulation or
RF, Microwave, Antennas and Optics :: 10.07.2010 03:45 :: pancho_hideboo :: Replies: 5 :: Views: 916
i've bought a TX and RX module.. TX have chip TDA5210 and RX K110.. its is FSK RF module.. here's the picture and the specifications..
Low Power Consumption for 5V?0.5V Operation
Designed for 434/868MHz communication systems
Low Spurious Noise
RF, Microwave, Antennas and Optics :: 03.01.2011 08:26 :: cuber18 :: Replies: 1 :: Views: 545
yes, i ll try.
I am implementing a communication transmission in Matlab, it means, there are a transmitter and a receiver.
Modulation could be ask. I have programmed a 'weak signal detection method' in the receiver but it doesnt work as well as 'a coherent detection system (BPF + cos(wt))' works.
The point is that my 'weak signal detection method'
Digital communication :: 15.01.2011 04:57 :: Xavipersonal :: Replies: 3 :: Views: 395
first of all, state clearly which Tx and Rx you are using ??
If you are using simple IR LED as Tx and a 38/36/40 kHz detector at Rx, then for programming on the Tx side, make a function which will transmit a ask waves at 38 khz. So, when 1st switch is pressed on the Tx side, you are sending something like 0x01 hex ( 0000 0001 b) which is ask modul
Microcontrollers :: 28.05.2011 08:08 :: mehtadhaval :: Replies: 1 :: Views: 1593
1) make sure there is a current limiting resistor in series with the external led
2) These ask receivers are very sensitive to noise--any noise. Also they do not work at all if overloaded (transmitter is too close). Finally, they are "tuned up" for a 4800 bps data rate--if you are too fast or too slow, the demodulator circuit has the wrong time
RF, Microwave, Antennas and Optics :: 10.02.2013 10:34 :: biff44 :: Replies: 5 :: Views: 526
I'm new here and would like to ask for feedback advices on an idea.
Is it possible to perform digital to analog, then analog to digital conversion of a signal without any loss?
I mean the resulting digital signal should be the the same, bit-for-bit as the original one.
The plan is to connect two PC sound card and send thr
Digital Signal Processing :: 25.03.2013 16:06 :: gaiuscaesar :: Replies: 1 :: Views: 209