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Another main reason is communication capicity, which is realted to channel bandwidth and power. If you use lower frequency, the bandwidth is reduced of course, at 10KHz, you cannot achieve 20 KHz bandwidth. Then to support 1 Mb/s data rate, you have to use very high level modulation scheme and...
FPGA consumes more current than DSP for the same functionality. DSP is more flexible in programming. FPGA is also hard for timing, while dsp is not that critical.
You can compensate it in digital domain, by calibrating with the weakest signal. By measuring the DC offset when there is no signal, then substract the same offset from the real time signal. Some solution calibrate once some everytime.
input to lna
It all depends what you want. Actually, you can put a low frequency trap in the input of LNA, which will improve the IIP3 greatly and make the 9.6dB rule invalid. It includes an inductor > 1 uH and a cap in serial usually.
You can just go to maxim-ic.com. I suggest you just evaluate their 2.4 GHz solution for WLAN. Those are cheap, tested. And you can apply to 2.5 GHz without problems. You need to choose the technology like SiGe, or similar.
The simplest way is use dipole antenna. It is small, and easy to get. If you want to use patch antenna, I am not sure whether you will buy or design yourself. If you just want to have your own network at home, you can get the off the shelf devices/components. If you want to design the...
WLAN for voice.
Does anyone ever research the possibility of using WLAN for voice and high rate data service? From the specs, if we have enough base coverage, we can achieve the same service as 3G or even better, but with much low cost. The 802.11a support higher data rate than any current 3G...
Yes you can. I am not sure whether you are familar with the HAM radio. People are using modem with HF/VHF/UHF transceiver transmitting packet data over the air for a long time. The only thing you need to pay attention is protocol. You will not be able to use your current software. Use google...
You can also try ansys, a good FEM software. That software can do both mech and EM simulations. Although the EM simulation is not very powerful, especially for anisotropic dielectric or ferrite. But I believe it will be enough for most case, especially for MEMS. I havent heard any one doing...
According to a lot of literature, transponder means receiving then transmitting. However, for the radio signal, you cannot just put an amplifier there. I may couse oscillating if you just amplify the original signal. I havent seen those real transponder yet. But for the HAM transponder, you will...
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