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39 Threads found on edaboard.com: Ask Demodulation
Hi everyone. 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 (...)
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.
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
Hi 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. Thanks
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.
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
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
see this general PSK type . you can modify it to ask , it is very simple clc; clear all; disp('M-Array PSK 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-PSK modulation to produce y y=modulate(modem.
Look at this simulink(matlab 7.0 or later) model: qpsk_fb_symbol_sync_fb_phase_sync_agc_2008_05_15.rar and ask questions...
clc; clear all; 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 y=modulate(modem.qammod(M),x); %% %follow with rectangular pulse shaping. ypulse=rectpulse(y,n
Hi, 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? Regards, Chris
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.
Check this
I'm not sure if they use multipliers. Do you have references for squarer stages used with ask demodulation?
Hi there, 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!!
Hello, 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
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
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..
Hello, 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 (...)
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
Hi all, 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? Thanks a
check ti ISM band tarnsivers , these IC's very good , have FSK , ask modulation and demodulation , and controller via a micrcontrollers khouly
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.... Super chip. Paul. I would select frequency hopping since ihis is th
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 or Next time ask google first...
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.
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"..
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
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
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
this is simple examples for ask MOODULATION i will upload alot of tutorial about digital modulation
Please see details at Feel free to ask any question ? we will respond in 12 h or sooner (depending on a time zone shift).
I understand, that in EPC Class-1 Generation-2 modulation methods no carrier is either added or supressed. Cause the digital baseband signal is non-zero in idle state, an idle carrier is transmitted in each of the 3 methods (which is obviously required for RFID with passive tags). While DSB-ask has a continuous carrier by definition, SSB-ask and
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
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
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.. Features: Low Power Consumption for 5V?0.5V Operation Designed for 434/868MHz communication systems FSK Modulation/demodulation Low Spurious Noise Data Rat
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'
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
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
Hello everyone, 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