Beam-forming
Presented by Wally
Adviser : Hsin-Mu Tsai
Beam
Forming
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Beam-Forming = DIY Laser?
In Radar
In WLAN
Hey ! I want math!!
Challenge:
Why beam-forming ?
Answer
Design and Experimental Evaluation of Multi-User Beam-forming in Wireless LANs
Hmmm... I'll try my best
Scenario
Synchronization
Some equations
Challenge : How to optimize ?
Challenge : Under what condition performs bad ?
Nice ~ How about VLP?
LED array
0.5 ~ 1m between LEDs
Transmitting Frequency ?
MHz scale
3*10^8 / 10^6 = 300 m ....
H almoooooost the same = =
1m / 300m = 1 degree....
So... My experiment ...
2 LED....
3 LED....
Really ?
有天我做了一個好真實的夢....
Future Work
Finish WN Lab#2....
calculate the H matrix rather than try and error
Request For HELP
Condition to optimize ???
Dual Cam-com
Why dual camera ?
Naive : 30fps + 30 fps = 60 fps ??
Hmmmmm....
+
=
Challenge
What is the real reason ??
Frequency aliasing
Easy way to understand
real period = 20 ms (50Hz
sample period = 25 ms (40Hz
alias period ??
t = 0, A = R(0)
t = 25, A = R(25) = R(5)
t = 50, A = R(50) = R(10)
...
t = 100, A = R(100) = R(0)
Real frequency = 50Hz
Alias frequency = 10 Hz = 50 mod 40
Back to CamCom
Beamforming
By wally wei
