Vegetation is a bad thing since it causes signal absorbtion.
Reflection are nice, since it helps signals around the corners. Multipath is not much of a problem with suitable modulation methods, such as COFDM or DSSS. Some diversity can be used with two or more antennas on the same unit. MIMO (Multiple Input Multiple) antennas can be used to dynamically pick out a specific reflection or even summing multiple reflections.
This was a problem of the old NBFM systems with frequent multipath nulls, one of which is always just ahead of the red traffic light :-). NBFM was usable even above 1 GHz even if the signal was interrupted tens or hundred times each second when driving at road speeds, but problem started, if you had to stop at traffic lights. Modern wide band modulation methods get away with much of this selective fading issue.
I have often wondered, how much data rate is needed by a handheld unit. Due to the small screen on most handheld devices, the data rate needed is only a few megabits / second.
Running a data base engine on a handheld which loads the whole data base into the handheld before selecting the requested data will require a huge bandwidth, but such applications do not make much sense,
True. 5G claims up to 10Gbps, which would allow you to download a full length movie in a few minutes. This is a scam. Most cable companies only offer 100Mbps, and WiFi usually runs at 100Mbps. So there is no way you could use 10Gbps.
Plain 4G is more than fast enough, and 5G is simply expensive hype.
Here are some links with numbers:
Does 5G affect Internet speed?
What is clear is that 5G can provide download speeds of up to 10 Gbps, which is much faster than most existing wireless and home broadband connections. Cable company home broadband plans often start at 100Mbps - a fraction of what's possible with 5G.
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What is a good WiFi speed?
Internet speeds in the 100 - 200 Mbps range are considered to be good, since they can handle common uses like streaming and video chat for 2 - 5 users at once. Speeds above 200 Mbps and up into the
1,000 Mbps range are considered to be faster than average, and can support five or more users.
What is a good WiFi speed?
4-6 mbps will provide a good Web surfing experience.
6-10 mbps: Usually an excellent Web surfing experience. Generally quick enough to stream a 1080p (high-def) video.
10-20 mbps: More appropriate for a "super user" who wants a reliable experience to stream content and/or make fast downloads.
How many GB is a 2 hour movie?
High definition (HD) videos use 3 GB per hour.
4K Ultra HD streams use up to 7 GB per hour of video. This means you'll use around 2 GB to stream a two-hour SD movie, 6 GB to stream the HD version or 14 GB for the 4K stream.
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SMARTPHONES
Most smartphones come with 32GB, 64GB, or 128GB of inbuilt storage, with a few high-end models featuring 256GB or 512GB.
Your operating system will take up about 5GB to 10GB of storage and you'll need to factor about the same for all your apps.
If you use your phone for sending messages and emails, browsing the internet and taking the occasional photo then 32GB should be plenty.
But if you like taking a lot of photos and videos then you should consider 64GB, but even then you may need to move some files to your computer or portable hard drive.
Videos and photos take up a lot of storage space. A 30-second video is about 50 megabytes (MB) so 20 clips will take up 1GB, and once you add all in your photos you quickly start running out of space.
If you do take a lot of videos and also like downloading movies to watch on your phone then you'll need to look at 128GB or 256GB of storage.
Another consideration is music. If you use a streaming service then you don't need to worry about have much space is available but if you're still downloading songs then you'll consider how many you like to have on your phone. For example, 200 songs takes up about
1GB of storage.
Also, check if your phone has expandable storage. iPhones don't but many Android devices do.
You can buy a microSD card that's inserted into your phone. Expect to pay about $50 for 64GB and it's worth paying extra for a reliable brand such as SanDisk or Samsung.
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