massive mimo Fundamentals, Opportunities and Challenges
应用背景Massive multiuser MIMO (MISO):
◮ M ≫ K ≫ 1 (think 100 × 10 or 500 × 50)
◮ coherent, but simple, processing
◮ Potential to dramatically improve rate & reliability
◮ Potential to drastically scale down TX power
◮ Not only theory, at least one known testbed (64× ∼10)
关键技术
Massive MIMO Operation
Not enough resources for pilots & CSI feedback, so operate in TDD.
◮ On the uplink,
◮ acquire CSI from uplink pilots and/or blindly from data
◮ detect symbols
◮ M ≫ K ⇒ linear processing (MRC, ZF, MMSE) nearly optimal
◮ On the downlink,
◮ use CSI obtained on the uplink
◮ make necessary adjustments based on reciprocity calibration
◮ apply multiuser MIMO precoding
◮ simple precoders desirable (and very good!): MRT, ZF, MMSE, ...
◮ MRC/MRT operation
◮ intracell interference will appear as
- 2022-07-07 16:58:08下载
- 积分:1
能运算的函数: sin,cos,tg,ctg,e^,pow(x,y),cosh,sinh,tgh,log10,ln,sqrt,arcsin,arccos,...
能运算的函数: sin,cos,tg,ctg,e^,pow(x,y),cosh,sinh,tgh,log10,ln,sqrt,arcsin,arccos,
运算方式: +,-,*,/,绝对值(“[ ]”),^,!,
输入规则: 用键盘或按钮都可,输入完按回车运算,(光标要在最后)
sin(21-32)/(12-43)
4(323-4343) 4*(323-4343) e^2-sin3-3^4,(不要输入pow(3,4)) //有无*都可
2*3^4是(2*3)^4 而不是2*(3^4) 也就是要用x^y就要一定要(x^y)加上一个括号
[3-4]是求3-4的绝对值不是中括号 -performance computing functions : sin, cos, tg, rays, e ^, pow (x, y), cosh, sinh, tgh, log10, ln, sqrt, Simulation, arccos computational methods : absolute ,-,*,/, ( "[]"),^,!, importation rules : a keyboard or buttons which can be imported by the transport operator End (cursor to the final) sin (21-32)/(12-43) 4 (323-4343) 4* ( 323-4343), e ^ 2- KF-3 ^ 4 (do not enter pow (3,4))//* there can be 2* 3 ^ 4 is (2* 3) ^ 4 rather than 2* (3 ^ 4) was needed x ^ y must have (x ^ y) with a brackets [3-4] is the pursuit of 3-4 is not the absolute value of the brackets
- 2022-01-26 03:43:37下载
- 积分:1