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128 Threads found on Coherent
Hi, i want to realize a bpsk demodulator for a receiver tha is not coherent with the transmitter, so the phase of the receiver's local oscillator could be unknown. I read about costas loop but i don't understand how to realize/simulate it. I understand that i have to multiply the input by SINE and COSINE and filter out high frequencies component
It is probably incoherent over the short term but over a long interval it may still be coherent with a PLL and could be harmonically related as harmonics of some lowest common denominator.
Which windowing function are you using? Also can you double check if your coherent sampling is correct.
I don't know absolutely wht's this : optimal coherent signal processing please help me . tnx everybody
If TX are generated, It means that packets are well generated by your board. Now if these packets does not reach your PC, it means that the Destination ip address of your packets are not your PC. Make sure that your ip address lan interface is well configured. For example, the IP address of your board are not coherent with your local network (ex: I
Hi, Please kindly help me~~:cry::cry::cry::cry::-(:-(:-( coherent and Noncoherent detection for MFSK, which needs larger bandwidth??? Why? Assume 4-FSK and binary FSK have same bandwidth, using noncoherent detection, do they have same bit rate?? I mean: According to R/bandwidth=2log2(symbol number)/(symbol numbe
I am working on Optical OFDM using Optisystem. Detection used is coherent. I used 4QAM modulator and demodulator. It is basically four channel OFDM each having data rate of 10 Gb/s. These four channels are send simultaneously using WDM. The Transmission link consists of two optical amplifiers and two optical fibers. After coherent detection i
you need to convert the two linear polarizations into one polarization. Some sort of mode converter. If the two polarizations are not coherent, u could just take off the two polarizations to two coax connectors, and power combine them.
1st of all, there would be no interference if the two transmitters are not coherent , having the same frequency, so even if spatially they are close to each other it doesn't matter what does matter is the operating frequency. Yes they would if you make a tdm plan that is no module can transmit while the other is, each transmitter have certain time
hey shushank.thnx for guide suggest me coherent optical OFDM ,DWDM and tunable filters..what about it??
The energy isn't destroyed. When you have a position where you have full destructive interference, you have other positions where you have full constructive interference. That means both H and E will double, hence the power density will be 4 times higher. If you have two coherent sources with large separation and same strength, you get grating
Hello guys, I have implemented an ideal ADC+DAC converter and I did an FFT analysis. I did a test with coherent sampling with rectangular window and everything was ok. Input freq. 1,376...MHz, 500mV, sinewave and a starting phase of -90?. That gave Me 7,96bits (8bits ideal). Then I changed the phase to -60? and rectangular window and gave me
hi all, kindly, i make sar adc 8-bit and i wanna measure its dynamic performance to calculate ENOB , my max i/p frequency is 574K and fs=2Mhz i choose Nrecord=2048 and Nwindow=585 so fin=573.3K , is this true and what's exactly method to know i.p sinwave needed in fft? thx in advance
Er.. the whole point of combiners is to combine signals, that is, to add signals to the spectrum of those already there, so long as they are all within the operational passband of the combiner. They do not have to be related in any other way. There are uses for combiners where the inputs are deliberately coherent, though possibly p
Hi, I won't say you are "absurdly stupid" but I will say you are misguided. Trying to take some disassembled code like that and turn it into something coherent is difficult to say the least. I would say you have two clear choices, continue to search for some ready made project code that does have the assembly code or sit down and l
I doubt you will get 1mm accuracy with the Sharp sensor, let alone 0.1mm. I cannot see ultrasound being viable for that sort of accuracy. I would have said light was your best option. A coherent laser source using interferometry would be the most accurate but expensive and incremental. A modulated laser phase shift system might be the best
2.) When two dBm numbers need to be added up (for the non-coherent case that FvM mentioned), one cannot avoid the pain of converting back to linear first. This is where even using decibel format could not help. It's right in order to have exact values, but I don't agree with the second part: In that c
I do not see any purpose in using two signals at the same frequency. If they are coherent, they will add up to make one wave. What is what you want?
coherent and noncoherent detection ◮ absolute modulation −→ channel equalisation, coherent detection ◮ differential modulation −→ noncoherent detection 2. Estimation principles ◮ least squares ◮ MMSE 3. Data estimation ϋ
coherent optical dft spread ofdm with pdm,help to implement for a radio over fiber system,doing m tech thesis,to reduce papr,simulation using matlab