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Hi guys,
I am currently writing-up my PhD thesis, research topic is in the area 4G LTE and optical fibre communication integration, from not very well reputed university in UK. I have published about 8 papers, where 3 of it are IEEE journals. I have another 3 under review, with one of it is...
Hi, I am designing an RF link. Before my spectrum analyzer, I have an RF low noise amp with a NF of 2.5 dB. Without this amplifier, my error vector magnitude or error rate is 2.1%, after an amplifier it goes down to 0.7%.
My question is, the receiving signal will have its own SNR and with that...
Hi guys. I have an important question. I have a my full program of OFDM and a laser to modulate it in Matlab. its optical communication.
Now I have a solid complicated nonlinear Schrodinger equation to defines my optical fibre. To program it in matlab might take me ages. Cause it concerns...
Hi vimalkhanna. Thanks for your reply. Can you explain please how this CMOS logic 4066 works and why need 547/337 after this? Also can you specifically state what is 547 or 337 please? Thank you very much.
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Hi...
Hi guys. I recently posted to discuss on switching signals. I have resolved that.
Now, Im trying to switch a DC voltage/current.
Say Im supply a DC stable bias current of about 40 mA. If I want to switch it off at certain time interval, maximum of 40 us. Which means, the maximum pulsewidth...
Hi guys, can anyone suggest a switch that works similarly like CD4016 IC (Quad Bilateral Switch for Analog & digital signal) that operates for signal minimum of 3 GHz. Cause this switch only operates at MHz range. Please someone. Thank you. Attached is datasheet for the switch.
Hi Chuckey. Thanks for your reply.
My "bias" has different input and the cathode has different. The cathode have to be supplied at 2.5 V, the "bias" should be supplied between 40 mA to 120 mA.
The 100 kHz is only the pulsewidth, and not period. It should one time switching. Once the rise...
Hi guys, Im Thava. Im working in optical communication. Currently I want to design a circuit to turn of couple of inputs to my laser.
Say I have a supply of 5V to two pins of the laser, anode and cathode (pin 1 and pin 2). And then a bias current to another pin (pin 3).
At some interval of...
Hi guys, I have a problem in understanding LTE. LTE is the long term evolution 4G technology. The LTE requirement is 100 Mbps with 1.3, 2.5, 5, 10, 15 and 20 MHz for 128, 256, 512, 1024, 1536 and 2048 subcarriers.
Each bandwidth corresponds to each number of subcarriers.
My problem here is...
Hi guys, Im trying to implement Analogue FDM on top of my single carrier modulation (eg: QAM and QPSK) or Multi carrier modulation (eg: OFDM). For an example, I have two different pair of I and Q channels, where first pair is upconverted at 2.2 GHz and the next pair at say 2.7 GHz and them MUX...
Hi guys, I am having real trouble to design a transmit filter for my OFDM system.
Here is the scenario. Initially I have upsampled after adding cyclic prefix to achieve 20 MHz bandwidth. Let me explain my parameters first.
-I have 128 subcarriers of data and zeros
-Modulated them with...
Hi guys, Im having problem with on analyzing the time of the symbols or bandwidth of the discrete signals after IFFT in OFDM. Below are my codes that I used.
nchannel1=128; %Total number of carriers
nchannel =76; %Occupied carriers with OFDM symbols
padding=nchannel1-nchannel; %zero padding...
Hi guys, I understand that I can design OFDM system with Labview software. My question is:
If anyone have experience using Agilent equipment, please help me out:
-Can we implement the I and Q vectors from the labview directly into agilent E4438C ESG vector signal generator via GPIB or LAN...
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