![]() Signal-to-noise ratio is the ratio of the amplitude of the signal of interest to the amplitude of the surrounding noise floor or competing signals. There are many ways of increasing SNR, but the use and careful placement of remote antennas may be the most straightforward and accessible. ![]() Keeping signal-to-noise ratio as high as possible is the most effective (although not the only) means for reducing dropouts and interference on wireless devices of any kind. When it comes to wireless audio signal quality, nothing is more important than maintaining excellent signal-to-noise ratio (SNR). Alex Milne, author at Audio Gloss, explains more. He is the author of the books Wireless LANs (Sams) and Wireless Networks – First Step (Cisco Press).Share this How External Antennas Improve Signal-to-Noise Ratio Jim Geier provides independent consulting services and training to companies developing and deploying wireless network solutions. Thus, it’s generally a good idea to recheck the SNR from time-to-time, even after the network is operational. Changes made in the facility, such as the addition of walls and movement of large boxes, will affect SNR too. ![]() A variance in antenna gain between the survey equipment and user device will likely result in users having different SNR (and performance) than what you measured during the survey. When measuring SNRs, be sure to use the same radio card and antenna as the users will have if possible. Users associating with access points at closer range will have higher SNR and better performance. Keep in mind that the corresponding level of performance only occurs at the boundary of each access point. That ensures a constant association with fairly good performance. These values seem consistent with testing I’ve done in the past, as well as what some of the vendors publish.īased on this testing, I recommend using around 20dB as the minimum SNR for defining the range boundary of each access point. > 40dB SNR = Excellent signal (5 bars) always associated lightening fast.Ģ5dB to 40dB SNR = Very good signal (3 – 4 bars) always associated very fast.ġ5dB to 25dB SNR = Low signal (2 bars) always associated usually fast.ġ0dB – 15dB SNR = very low signal (1 bar) mostly associated mostly slow.ĥdB to 10dB SNR = no signal not associated no go. To ensure accurate comparisons, I cleared the laptop’s cache before reloading the page: For various SNRs, here’s what I found for the signal strength (found in the Windows radio status), association status, and performance when loading the webpage from a wireless laptop. I recently ran user-oriented tests to determine the impacts of SNR values on the ability for a user to associate with an 802.11b/g access point and load a particular webpage.
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