This document discusses MIMO (multi-input multi-output) wireless systems. MIMO uses multiple antennas at both the transmitter and receiver to improve capacity, range, and reliability compared to traditional SISO systems. It works by transmitting multiple parallel signals that take different paths to the receiver due to multipath propagation. The receiver then uses signal processing to combine these signals into a single output. MIMO can significantly increase channel capacity compared to SISO, SIMO, and MISO configurations according to Shannon's capacity formula. A key challenge is fading effects which can degrade signal quality.

1. MIMO WIRELESS SYSTEM
Created By:-
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2. WIRELESS SYSTEM
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3. Summary of Wireless System• Existed for less than 200 years.
• Wireless telephony began to appear in 1907.
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4. Mimo background• Mimo OVERVIEW
• Mimo Channel Capacity
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5. 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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6. X1(k)
Y1(k)
X2(k)
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Xn(k)
Y2(k)
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Yn(k)
WIRELESS
CHANNEL
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7. Four basic models• SISO
• SIMO
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8. • MISO
• MIMO
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10. CHANNEL CAPACITY•
SISOC= log2(1+y) bps/hz (shannon formula)
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SIMOC= log2(1+my)
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MISOC=log2(1+ny)
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MIMOC=log2(1+mny)
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12. How MIMO works•
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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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17. PROBLEMS IN MIMO• Fading;
a- Small scale
b- Large scale
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