Interesting developments are now happening fast and furious(ly) in the lower power-wide area strategies. Several initiatives are going on with LoRa, Sigfox and Weightless. I am not a good enough engineer to get terribly into the details, and when it comes to RF my weaknesses are pretty apparent. However my experience is that good radio frequency engineers are an elite bunch, so I will aim this article at guiding the rest of us.
Weightless is a set of standards in the sub 1 GHz license spectrum. Weightless presently has two variants: Weightless N, which is architected in a star network and is suited to urban environments; and Weightless W, which works well for TV White Space solutions.
LoRa is a set of star network implementations that transmit low power, long-range microwave signals between end-devices and gateways spread out on different frequency channels and data rates. The selection of the data rate is a tradeoff between communication range and message duration. Due to the spread-spectrum technology, communications with different data rates do not interfere with each other. Implementations are categorized as “A” end devices that use an ALOHA (think Ethernet) type protocol; “B”, bidirectional with scheduled transmissions; and “C”, which transmits continuous signals...Read More
By 
Tidak ada komentar:
Posting Komentar