Mimo wireless system
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Transcript of Mimo wireless system
MIMO WIRELESS SYSTEM
Created By:-
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WIRELESS SYSTEM
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Summary of Wireless System- • Existed for less than 200 years. • Wireless telephony began to appear in 1907.
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Mimo background- • Mimo OVERVIEW • Mimo Channel Capacity
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MIMO OVERVIEW- MIMO Stands for multi input multi output. Uses multiple antennas at transmitter & reciever
port. MIMO exploits the space dimension to improve
wireless systems capacity, range and reliability. An antenna technology that is used both in
transmission andreceiver equipment for wireless radio communication
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WIRELESS CHANNEL
X1(k) Y1(k) X2(k) Y2(k) . . . . . . . . . . . . Xn(k) Yn(k) AndroidWallet.blogspot.in
Four basic models-
• SISO • SIMO
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• MISO • MIMO
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CHANNEL CAPACITY- • SISO- C= log2(1+y) bps/hz (shannon formula) • SIMO- C= log2(1+my)
• MISO- C=log2(1+ny) • MIMO- C=log2(1+mny)
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How MIMO works- • MIMO takes advantage of multi-path. • MIMO uses multiple antennas to send multiple parallel signals (from • transmitter). • In an urban environment, these signals will bounce off trees, • buildings, etc. and continue on their way to their destination (the • receiver) but in different directions. • “Multi-path” occurs when the different signals arrive at the receiver • at various times. • With MIMO, the receiving end uses an algorithm or special signal • processing to sort out the multiple signals to produce one signal that • has the originally transmitted data.
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PROBLEMS IN MIMO-
• Fading; a- Small scale b- Large scale
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