5G NR: Massive MIMO in 5G #Part-3


Now Massive MIMO So it is important that you stay connected with me to the last of video and if you watching this video on YouTube then please click on red subscribe button and also click on bell button to enable the email notification. If you are watching this video on Facebook then please click to like and follow the page. Now Massive MIMO First question comes Why Massive MIMO?? We use very High freq signal in 5G High frequency means size of single antenna will be very small That means there aperture size will be very small We can say antenna area Antenna area of receiving energy will be very small To overcome this issue in high frequency by using larger number of transmission antenna You can see here distance between transceiver and receiver antenna is R. Received power is inversely proportional to square of the distance…From the transmission antenna That means Prx=Ptx/4R2 R is the distance between Tx and Rx antenna If distance get increase by two times away then received power will decrease by 4 times In real scenario we know that received signal power is also affected by frequency and received antenna gain Grx is received antenna gain Here I have told Received power is affected by frequency Affected by frequency means….. If frequency increase then their wavelength will decrease If wavelength will decrease their received power will decrease so received signal power will affected by frequency and received antenna gain As mathematically formula is we can see here..Received power is proportional to the square of the wavelength square of the wavelength Received power is proportional to the square of the wavelength From example we can say Antenna gain does not change and Frequency get increased by 2 times Frequency get increased by 2 times If Frequency get increased by 2 times That means wavelength will decrease by 2 times That means wavelength will get decrease by 2 times means…lemda/2 That means received power will decrease by 4 times (lemda/2)2 Received power will decrease by 4 times In another example If we use 3GHz freq in current communication and now we use 30GHz FREQ in 5G NR wavelength in 30 GHz is 10 times shorter then 3GHz Because frequency is increased by 10 times then wavelength will decrease also by 10 times It means received power at 30 GHz will be 100 times lower then received power at 3GHz frequency Now received power become 100 times lower …so what need to do here? If we will multiply by 100 times then received power will maintain right…. We can resolve this issue by multiplying by 100 times so here we will add another parameter…This is transmitter antenna gain… In that situation it will get more complicated because not only receiver antenna gain but also transmitter antenna gain will play the role to increase received signal power.

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