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Telecom Business Review | Friday, February 18, 2022
In-building wireless improves cellular performance in any frequency band, including low-frequency frequencies that can penetrate structures.
FREMONT, CA: The world is buzzing about the possibility of 5G, but getting that connectivity inside buildings is just as crucial. Many customers are unaware that 5G frequencies may not be able to transmit inside buildings without additional expenditure and equipment. Cellular connections begin and stop indoors in the wireless industry. Indoor coverage, whether at home or in public, was twice as significant by early 5G adopters as 5G speeds or device battery life. There are several approaches to bringing a macro cellular network indoors, but none is more widespread than dispersed antenna systems (DAS). It is a tried-and-true technology that will be essential for the future growth of 5G.
DAS and several other technologies will continue to be essential for bringing 5G indoors. Still, structures will need to accommodate LTE and various frequency bands used by the three primary US carriers. DAS modularity and the capacity for each DAS to accommodate all of these various frequency bands are thus more crucial than ever. There is no magic solution for picking in-building communication systems, but choosing future-proof one will help avoid having to rip and replace everything.
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Provide enhanced signals
Remote units (RUs) are scattered throughout various deployment sectors and linked to the head-end by fiber optic cables. Depending on the output transmission power of the RU, each RU is further connected via coaxial cable to several serving antennas scattered across the facility to build an antenna network and offer a strong signal there. In some instances, tiny cells are employed to provide a signal source for DAS in place of a base station. It's vital to note that whereas tiny cells are frequently used to increase coverage for a single band or single carrier, DAS excels at bringing coverage for multi-bands or multi-carriers.
Better scalability
Most contemporary deployments use active DASs, which send signals between HE and RUs through a fiber-optic cable. The scalable active DAS is ideal for medium- to large-sized structures. The best DAS for small to medium-sized structures is passive. Passive DAS frequently uses bi-directional amplifiers (BDA) to redistribute signals, and it enhances and distributes wireless coverage from the closest tower using a donor antenna. The scalability of passive DAS is constrained because donor site input determines the strength of the signal. However, installing it can be less expensive.
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