MIMO In Wireless Communication

Kailash KarkiM.Tech(Communication and Radar System)

ID No:152040006

kailash202012@gmail.com

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Introduction

• MIMO stands for Multiple Input Multiple Output.

• Technology that used multiple antenna in transmitter side as well as in receiver side.

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Problem Statement

• Capacity C=B*log2(1+SNR)

• Quality• Coverage

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Multipath Propagation

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Existing Systems Before MIMO

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MISO-Multiple Input Single Output-Also called Transmitter Diversity

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SIMO• Single input Multiple Output• Also called Receiver diversity• Out of two signals the receiver processes

strongest one.

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How MIMO works?

• MIMO takes advantages of Multipath.• 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) .

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Continue:

• “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.

• Multiple data streams transmitted in a single channel at the same time.

• Multiple radio collects multipath signals.• Adaptive signal processing at both transmitter and

receiver

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Formats For MIMO• Spatial Diversity: - Same information is transmitted by different antenna. - Improves the link reliability. - Improves the coverage.

• Spatial Multiplexing: -Information is divided into number of streams. -Different antenna transmit different data streams. -Increase the data rate.

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MIMO Diversity and MIMO Multiplexing

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MIMO System Model

Transmit Vector MIMO Channel Received vector

X1X2X3..XM

Y1Y2..YN

M*1 Matrix N*1 Matrix

N*M Matrix

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Contn.........• Y=h x + n

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Multipath is enemy????

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MIMO Capacity• Capacity of MIMO system: C=n*B*log2(1+SNR)

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Advantages of MIMO• Takes advantage of Multipath propagation.• Increased Capacity.• Increased Quality.• Spectral Efficiency.

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Applications

• HSPA+(3G)• WiMax (IEEE 802.16)• LTE(4G)• 5G (proposed)

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Thank you