2010年9月2日 · So for example, an increase of 6dB would correspond to an increase of (2x2) or four times the power. Conversely, a decrease of 6 dB would be one-fourth the power. Alternatively, for 6dB, ( 3dB + 3dB = 2 x 2 = 4 times the power) and ( -3dB -3dB = 1/2 x 1/2 = 1/4 the power). 6dB also equates to a doubling (or halving) of the range.

Bluetooth simply links the RSSI to dBm with +/- 6 dB accuracy in some cases; however, it also allows for a remapping of RSSI based on a golden range for receiver signal strength. That is, a device may have what the specification calls a golden range …

2010年2月9日 · The ratio of area 2 to area 1 is 4pi [ 20 squared ] to 4pi [ 10 squared ] = [ 20 squared ] / [ 10 squared ] = 4. Now 10 log 4 = 6 [ approximately ]. If you've ever wondered on the CWNA books why it says that when we double the distance, the loss is 6 dB, there is the reason.

2024年12月18日 · A 40 MHz channel will add 3 dB while an 80 MHz channel will add 6 dB to the noise floor. It's important to consider this during coverage planning to maintain the desired SNR. The second consideration is spectrum availability, including channels and transmit power levels allowed within the regulatory domain.

@1 m: -46 dB Every time you double the distance, you reduce signal by 6 dB AP @1 m: -46 dB Received signal = X I know I will get 1/4 of that at 2d d 2d Distance For the same reason, if you reduce your power by 6 dB You get the same signal at half the distance E.g.: AP at 17 dBm, RSSI -63 dBm @ 100 feet AP at 11 dm… -> signal about -63 dBm at ...

2019年5月30日 · From your numbers, the AP would be putting out (200/100) = + 3 dB more power.. The antenna gain difference is (8-2) = 6 dB. 3 + 6 = +9 dB advantage to the AP. A difference of 6 dB, is already double the range compared to the client. A real problem is that you can't equate most client device antennas with those on an AP.

2009年11月12日 · An increase from 10 Mhz to 20 MHz can be expressed as a 3 dB increase. If we add 3 dB to the last result, you can see that every 20 MHz wide channel must contain at least -101 dBm of noise. That is equal to 4 times (6 dB) the noise contained in a 5 MHz channel. Here’s the step-by-step process to get that, starting with the 5 MHz result from ...

2023年7月16日 · You can safely assume that if Cisco says it put out 17 dBm, at a certain modulation rate, in the 2.4 GHz band, it does that reliably across every channel with probably better than 0.5 dB variation. If a small AP claims that same power level, you "might " find the average power to be that high, but more likely that is the maximum power level on ...

2008年1月5日 · It shoud be the EIRP minus 22 db (Inverse Square law). 180 degree phase cancelation is rare, as is gain from receiving the signal from 2 seperate multpaths perfectly in phase. MIMO uses DSP to cancel out any multipath and combining the energy per symbol (via maximum ratio combining) of multiple receive antennas to produce gain, thereby ...

• Every Channel Bonding (of 40 MHz) results in SNR decreased by 3 dB. • For an 80 MHz channel SNR will decrease by 6 dB. • EIRP rules identify the maximum level of transmitted power regardless channel width. • With 6 GHz there is new threshold instead of EIRP - it’s called Power Spectral Density (PSD).