Mimo wireless system

MIMO WIRELESS SYSTEM

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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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