Hence, 1/32 gives the lowest protection and the highest data rate; 1/4 results in the best protection but the lowest data rate. Radio waves propagate at the speed of light, 3 μs per 1000 meter (5 μs/mile). Ideally, the guard interval is just longer than the delay spread of the channel.
What is the best guard interval short or long?
Shorter wait time (guard interval) between symbols increases throughput. However, if it’s too short, the amount of ISI will increase, and throughput will decrease. On the other hand, if the guard interval is too long, there is increased overhead due to the additional idle time.
Should I enable short guard interval?
When to use short GI? When intending to improve the throughput, enable short GI can improve the throughput about 10%. If the multipath effect is not too serious (not too many metals or other reflecting materials), you can enable short GI. If you are using 802.11n or 802.11ac only, you can enable short GI.
Should you enable SGI?
Turning on SGI can reduce that interval to 400ns. Only some vendors support SGI on 20MHz channels in the 2.4GHz spectrum. Turning on SGI can increase wireless data rate by 11% by reducing idle time in environments that are not very noisy. … It is definitely worth testing with SGI with both 40MHz and 20MHz channels.
For what purpose guard time is used?
Specified period of time used to separate transmissions so that they do not interfere with each other. In IEEE 802.11n, the guard interval has been reduced from 800 ns to 400 ns to boost the throughput. Also used in TDMA transmissions.
What is the best Dtim interval setting?
If you want an instant connection, keeping your DTIM interval at 1 and beacon interval at 100 will be ideal for you. However, it’s important to point out that a main drawback is that this heavily consumes the power of your battery. In fact, a lower DTIM interval could potentially use up to 20% more battery power.
Why the guard interval is provided in OFDM?
The Guard Interval is the ratio of the Cyclic Prefix “CP1) Contention period, or 2) Cyclic prefix” time to the inverse FFT. See Spectrum. time “T(IFFTInverse Fast Fourier Transform).” The guard interval is used to eliminate inter-symbol and inter-carrier interference. … The extra time is the guard interval.
Should I use 20 or 40 Mhz bandwidth?
If you use 2.4 Ghz broadcasting radio, you should use 20 Mhz for the channel width. The simple reason is that 20 Mhz is really a supportive measure for your older devices. … This is when you should use the 40 Mhz bandwidth. When You Should Use Combination of 20 / 40 Mhz Combination.
What is the best channel for 5ghz?
When using 5 GHz, it is recommended to use at least 40 MHz channel width, as some client devices may not prefer 5 GHz unless it offers a greater channel width than 2.4 GHz.
If using 40 MHz channel width, the bandwidth of the following channel is used:
- 36 – 40.
- 44 – 48.
- 149 – 153.
- 157 – 161.
Is 20 Mhz better than 40MHz?
A 20MHz channel width is wide enough to span one channel. … In crowded areas with a lot of frequency noise and interference, a single 20MHz channel will be more stable. 40MHz channel width allows for greater speed and faster transfer rates but it doesn’t perform as well in crowded areas.
What is the best RTS threshold setting?
The recommended standard of the RTS threshold is around 500. A low threshold implies RTS packets are transferred more frequently and the throughput of the packet is on the lower side.
What does disabling SSID broadcast do?
Disabling the SSID Broadcast is one way of securing your wireless network. This procedure will prevent other users from detecting your SSID or your wireless network name when they attempt to view the available wireless networks in your area.
What is network mode in Wi-Fi?
A wireless network mode is a state, or means of operating, that a wireless network can employ. In other words, they describe the various operational characteristics of the wireless signals. Think of them like AM and FM radio stations.