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Using other than a wired connection to transfer signals or power. Includes optical and (ultra)sound, but most often refers to RF (radio-frequent). Distances can be as low as centimeters (e.g. RFID), there's no upper limit.

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The discontinuity between symbols has spectral components higher than the channel width, and because individual channels are not bandpass filtered, it spreads into adjacent channels. This still happe …
answered Nov 27 '16 by Simon Richter
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Actually, the angle is 90 degrees, and in an ideal setup, the I and Q components are fully orthogonal. The system becomes clearer by splitting it between generation of a complex baseband signal and s …
answered Jun 11 '14 by Simon Richter
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There are two problems: Separately encoding symbols means that there are discontinuities where symbols are glued together. These discontinuities have theoretically infinite bandwidth, which would g …
answered Feb 19 '16 by Simon Richter
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Historical reasons. The original channel allocation is for 802.11 and 802.11b, which has 11 non-overlapping channels. The 802.11g standard increases the bandwidth used, which means that channel 1 is …
answered Oct 6 '15 by Simon Richter
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This sounds like a perfect match for LoRa. 10km in rural areas, no additional licence required, and lots of example designs to learn from.
answered Jun 4 '18 by Simon Richter
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The reference would be relative to the top of the dynamic range of the FFT block input, plus maybe a fixed offset. If you want absolute power, you need to know the gain for all the components between …
answered Jul 23 '14 by Simon Richter
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The CP acts as a buffer between the symbol and the wideband noise from the discontinuity at the symbol boundary. The higher-frequency components of that noise need to be filtered out as they exceed y …
answered May 1 '18 by Simon Richter
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I'd suggest using an RF relay, which will allow you easily keep the signal path shielded, which is a major factor when dealing with signal levels this low. The only way I'd use an IC here would be af …
answered Aug 6 '14 by Simon Richter