8/2/2023 0 Comments Signal path tribal tech![]() ![]() Journalist and Public Radio veteran Celeste Headlee (NPR, PBS, TEDx) examines old case files and interviews the investigators and family members who are still haunted by these killings. The media dubbed him “The Freeway Phantom.”įrom iHeartRadio and Tenderfoot TV, a new podcast reinvestigates the 50 year old unsolved murders of these young girls. Their bodies were discarded alongside DC freeways. The ability to precisely compute all of this information from multipath lets G1 take advantage of things like reflection and diffraction to bend around objects that would otherwise obstruct the signal.Between 19, six black girls went missing in the Washington D.C. With STFAP, reconstructing the original signal from the various multipaths can actually result in a stronger link because all available energy can be used. Specifically, STFAP works with AC-RD using the antenna arrays to receive the signal from various angles of arrival, amplitude, phases, and delays to combine multipath signals and recreate the original signal. It does this with a technique we call Space Time Frequency Adaptive Processing. Part of the reason G1 is so good at NLoS is, in fact, how it handles multipath. The question is, what is the right path? Or can you combine multiple paths to reconstruct the original signal? When a link is non-line of sight, multipath is guaranteed. AC-RD is a sophisticated, patented closed loop algorithm where the BN and the RN collaboratively work to converge on the optimal beamforming solution for improved link stability and reliability.Īnother enemy of link performance is when a signal is reflected or diffracted such that it takes multiple paths to get from the transmitter to the receiver, otherwise known as multipath. G1 takes beamforming to another level with auto-convergent retro-directive (AC-RD) beamforming. This increases signal strength and reduces the impact of attenuation or interference. With beamforming, the antenna array of the BN and the RN are able to direct RF energy along the best path between them in a directional manner. The more peepholes (antennas), the better chance you’ll be able to look through one or more and see the object you are looking for on the other side clearly. Think of it like a door with many peepholes. This means each device has an array of antennas that can be used to find the best link paths between them. It starts with distributed massive multiple-input, multiple-out (DM-MIMO) at the base node (BN) and the remote node (RN). Tarana G1 overcomes the negative impact of NLoS links in several ways. That’s often not practical either due to the cost of more base stations or because there simply aren’t enough potential mounting sites available. One option is to move base stations closer to homes in hope of getting a clear line of sight. Since chopping down trees or moving your neighbor’s house to get rid of obstacles is rarely an option, a good fixed wireless system needs a plan for dealing with NLoS. Unlike mobile networks where you can take your phone somewhere with a stronger, more reliable signal, the same can’t be done with your home if the connection is poor. Reliability (and customer satisfaction) is always an issue for fixed wireless. NLoS can also lower reliability due to changing conditions. ![]() ![]() Slower link speed impacts what service tiers (at a higher ARPU) can be sold to the customer. Shorter distances decrease the coverage area that a single base station can serve while increasing costs (more base stations needed). This is a big problem since NLoS propagation dramatically lowers range, link speed, and reliability. ![]()
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