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127 Threads found on edaboard.com: Am Demodulation
Hi All, I am a newbie to demodulation and carrier synchronization. For low power demodulation the data after ADC in RX, what are the various algorithms algorithm available? A google search returned Viterbi, LDPC, Matched filter etc. For optimum demodulation, one also needs carrier synchronization for good BER performance? What (...)
Dear sir/madam, I am working in implementation of chirp slope keying modulation and demodulation in MATLAB. Simulations that I completed are: 1. Chirp signal(up and down chirp) generation completed 2. Linear frequency modulation/chirp signal simulated 3. Random data generation completed 4. finally, i need
Dear sir/madam, I am working in implementation of chirp slope keying modulation and demodulation in MATLAB. Simulations that completed are: 1. Chirp signal(up and down chirp) generation completed 2. LFM with up-chirp and down-chirp simulated
Envelope of SSB rectified with detector does not recover intelligible audio. AM has envelope which after rectification gives normal audio. One of method for demodulation of SSB is to first mix SSB with carrier to get AM and then rectify it.
Hi I am working on an audio file in simulink .I have given the A-law compressor and expander for source coding and used digital pass band modulation and demodulation and unbuffer and buffer but still Im not getting an output without noise. Im unable to find out where is the mistake and how to rectify it. Please help me to solve this.
My project is to demodulate a SSB signal using a Freescale DSP Micro. I have completed the code for the FFT, filter and then IFFT with overlap add etc. Sampling is done at 20 kHz. What I am not sure if is how exactly is the SSB demodulation done with one complex FFT. What I know is: The I and Q channels are fed into the Real and Imaginary va
For AM, you can throw away the Q, and take the amplitude of I and there's your audio stream, badda-bing. Using the 31kHz as the "IF" I suppose would work but might lose you some audio quality (like you care, about AM audio quality to that degree). I think you'd have less software burden if you could notch filter the incoming signal, but if your ge
Hi I have downloaded I/Q samples of AM modulated signals (Radio broadcast) that contains 2 stations. one centered at 0 Khz and other at 8 Khz. I am able to play 0 Khz stations by demodulation. now i want to shift (down-conversion) the 8 Khz signal to 0 Khz. I understand the process and studied various books but by applying what i have studied i
Hi I have a question about direct down-conversion mixer Right now i have a RF AM signal like this. attachment1 ook It has it's carrier freq & signal freq we know that we can generate the above waveform by using a single mixer attachment2 mixer My question is ,can we demodulate this AM signal by a using a Direct down-conversion mixer
I am trying to implement 16 QAM MODEM & phasing a problem of demodulation of received signal. I want to know the algorithm for thresholding a received signal.
i am currently creating a code where the signal vector will be segmented out to a certain amount of bits and i will add noise to it and demodulation and get the BER. But my BER vs SNR plot graph looks very wierd to how a normal BER vs SNR graph should look like. I would appreciate if someone can tell me what is wrong with my code or something I am
We often see phasenoise being represented in dBc/Hz or deg rms. I am not very sure ,how to use these phasenoise values to find out whether the achieved phasenoise at a transmitter output is sufficient for an authentic or error free demodulation at receiver end? I believe these values are more stringent for say 8-psk than bpsk demodulation.:?:
for details of fm/am modulation and demodulation refer the book electronic communication systems by george kennedy here you will get the full idea fm / am radio
Hello I am building a CDMA simulation software and i have a question? I know that CDMA based on spreading data with PN codes by preforming xor operation between each bit of data to the PN sequence and also for multi user i need to spread the data by walsh code before i spread it by PN sequence(am i right????). So my question is :In order to crea
Can anybody name an IC that can be used for AM demodulation!!! I want to remove the carrier from Amplitude modulated signal of frequency 455 KHz and receive the signal in it. But no circuit. IC is required!! plz urgently To detect the modulation signal from the AM spectrum, you need literally a "crystal s
I want to know about how to construct a 43 tap FIR filter in verilog using "Generate" function in verilog, if you could please guide me, I am trying to make "costas loop " for demodulation and extraction of 8bit data word from 10 bit encoded BPSK transmission at 2 MHz, the system will work at CLK - 200MHz. I am trying to get all the modules in
Hi, I am implementing an OFDM modulation scheme as part of an LTE project in C/C++ and then testing it on a DSP board. I am using turbo coding with soft decision decoding. On the receiver side of the LTE system, I need to perform a soft demodulation (16-QAM and 64-QAM) so I can feed real values to the turbo coder for decodin
Hi, I am new to Digital Communications and MATLAB. I am learning to implement modulations and demodulations in MATLAB. I have an amplitude modulated signal at the receiver input. I am trying to recover the message bits after the demodulation. Following are the parameters of the modulated signal: Carrier frequency = 22000 Hz (can be
?In AM synchronous demodulation, Why we don?t divide the received signal, m(t)coswt, by cos(wt) using a simple divider circuit instead of multiplying by cos(wt)?? I asked this question to two professors and I got different answers: #Professor 1 Reply: "For your scheme to work you must know exactly what the frequency w is that the transmitter
I agree. CA3012 cannot be used for AM demodulation at all. The only internal stage that can be used in a AM receiver is the audio preamplifier, which is available at pin 14 and pin 12.