difference between CINR R3 and CINR R1

What is the difference between CINR R3 and CINR R1

Comments

#1

Frosty-MODERATOR wrote 2 years ago

Good question. I don't know, so I will ask ...

Cheers,

Steve

#2

meisamnaderi wrote 2 years ago

Thanks for your attention. but I made a mistake; CINR not CRNR ;)
Meisam

*** fixed that typo for you

#3

Frosty-MODERATOR wrote 2 years ago

OK, I got a quite long and very technical reply which I won't bore you with, but in layman's terms and very briefly:

* CINR means signal-to-noise ratio, as described in this FAQ article:
http://forum.vividwireless.com.au/forum/faqs/faq-what-are-rssi-and-cinr-...

* the R1 and R3 refer to "re-use 1" and "re-use 3" respectively, and this is a method of interference reduction which is part of the OFDMA specification ... it describes two different methods of using the wireless bandwith

* R1 CINR references how your connection is established ... you want it to be >15 dB to get and keep a stable connection

* R3 CINR references the level of performance (data transfer) you can expect and should normally be about 3dB higher than R1 CINR

* you want both of these to be as high as possible (close to 30)

* if R1 CINR is lower than R3 CINR by 5dB or more it may indicate that there is some interference in the area or significant multipath problems; moving the modem around may make it better

Does that help? I am going to add this to the RSSI and CINR FAQ now.

#4

meisamnaderi wrote 2 years ago

thank you so much sir, I think R1 is real CINR at the receiver but R3 is CINR after correction and amplification, is it correct?

#5

Frosty-MODERATOR wrote 2 years ago

There's a more technical explanation of WiMAX and OFDMA here if you are interested (I'm not an RF engineer, so I would be guessing):

http://www.itr-rescue.org/bin/pubdocs/mtg-weekly/9-16-05%20Intel_WiMAX_White_Paper%20(Hassib).pdf

#6

meisamnaderi wrote 2 years ago

Thank you so much indeed.

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