UNDERSTANDINGTHE CONCEPTOFMU-MIMO

HWM (Malaysia) - - LEARN - Ken­nyYeo

by MU-MIMO is shap­ing up to the next big thing in wire­less tech­nol­ogy, but how can it help im­prove wire­less per­for­mance and how does it work? Sit back and let us tell you. Let's start from the top. MIMO refers to Mul­ti­ple In­put Mul­ti­ple Out­put and refers to send­ing and re­ceiv­ing mul­ti­ple data sig­nals on the same ra­dio chan­nel and at the same time us­ing a tech­nique called mul­ti­path prop­a­ga­tion. Most wire­less de­vices to­day em­ploy MIMO to boost per­for­mance and a corol­lary to this is also the use of mul­ti­ple an­ten­nas at both the trans­mit­ting and re­ceiv­ing ends to im­prove wire­less per­for­mance. Us­ing mul­ti­ple an­ten­nas to trans­mit and re­ceive data im­proves re­li­a­bil­ity and speed. This is why you some­times see routers or client de­vices be­ing re­ferred to as 1x1 or 2x2 or even 3x3. The first num­ber denotes the num­ber of trans­mit­ting an­ten­nas, while the sec­ond refers to the num­ber of re­ceiv­ing an­ten­nas. For the most part, most routers and client de­vices use a sym­met­ri­cal de­sign.

How­ever, the next part is un­known to most users and it deals with how most routers in the mar­ket to­day work. The vast ma­jor­ity of routers in the mar­ket in the mar­ket to­day are SU-MIMO only or Sin­gle-User Mul­ti­ple In­put Mul­ti­ple Out­put. As hinted by the name, SU-MIMO tech­nol­ogy can only trans­mit to a sin­gle user (sin­gle de­vice) at a time. This is why per­for­mance de­grades rapidly as more and more de­vices are con­nected to the router. The router has to quickly serve one de­vice and go on to the next, and if there are many de­vices con­nected, the “wait­ing time” gets longer and longer.

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