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Relay-Assisted MIMOTransmission System

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Contents: What is MIMO? Basic Concepts of MIMO Forms of MIMO Concept of Cooperative MIMO What is a Relay? Why Relay channels? Types of Relays What is a Relay-Assisted MIMO system? Infrastructure Relay–Assisted MIMO system

Topologies of Relay Transmission Advantages, Applications of Relay-Assisted MIMO

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What is MIMO ?MIMO (Multiple Input and

Multiple Output):Multiple Input- ie. Multiple Antennas at the Transmitter. Multiple Output- ie. Multiple Antennas at the Receiver.

Basic MIMO

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Transmitter ReceiverUser Data

stream

User Data

stream

MIMO Antenna Array Technology

Antenna Array = Use of Multiple Antennas at the Transmitter and Receiver.

Basic Concepts of MIMO

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Spatial Multiplexing: Transmission of data signals (streams) from each of Multiple Antennas

Input

Streams

Output

Streams

Forms of MIMO

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SISO SIMO MISO MIMO

SISO : Single Input and Single Output

SIMO : Single Input and Multiple Output

MISO: Multiple Input and Single Output

MIMO: Multiple Input and Multiple Output

Basic SISO,SIMO,MISO

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Y - Antennay y

yYY

YY y

SISO

SIMO

MISO

No Multiple Antennas at both Transmitter or Receiver

Multiple Antennas at Receiver only

Multiple Antennas at Transmitter only

Functions of MIMO

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Minimize Errors Optimizes Data Speed

Advantages

High Throughput Avoids Multipath Fading

Concept of Cooperative MIMO

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Cooperative MIMO (Co-MIMO): Multiple Transmitters with Multiple Antennas each transmits different encoded streams to a Single Receiver with Multiple Antennas.

Advantages: High Multiplexing gain High diversity gain

Basic Co-MIMO

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Different Versions ofIdentical Information

Transmitter

Receiver

T1

T3

T2 R

What is a Relay ?

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Relay: Relays are the nodes or channels that interconnects the source(transmitter) and destination(receiver), which they can receive and transmit information from the source to destination.Basic Relay:

Relay with single antenna , transmitter and receiver.

Relay with multiple antennas, transmitter and receiver.

Relay Relay

Phases in Relay

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Relay-Receive Phase : This is the part of the relays, wherethey receive the signal from a transmitter (Source).

Relay-Transmit Phase : This part of the relay transmits the received signal to a receiver (Destination).Relay-Receive Relay-Transmit

Relay

Why Relay channels ?

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Because, They link source and destination easily even in a dense network.

High speed transfer even on challenging environment.

They improve overall throughput.

They improves the network coverage, since MIMO are poor at long range coverage.

Minimizes the propagation delay on MIMO.

Application of Relay

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Relay as node

Source Destination

Shor

ter di

stan

ce

Shorter distance

Large distance

Types of Relays

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Amplifier and Forward : Relay Amplifies the received and then forwards.

Decode and Forward : Relay decodes the received in the relay-receive phase and transmits after re-encoding.

Compress and Forward : Relay compresses the received and then transmits from relay-transmit phase.

What is Relay-Assisted MIMO?

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Relay-Assisted MIMO : Application of relays in between the source and destination of a MIMO transmission system is relay-assisted MIMO transmission system.

For : High speed data transfer and increases efficiency of the transmission.

Basic Relay-Assisted MIMO

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Transmitter Receiver

Relays

Infrastructure Relay-Assisted MIMO

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Infrastructure Relay-Assisted MIMO: It is the design format by which the relays are arranged in a pattern, such that it makes communication more effective when placed between a MIMO. Infrastructure is based on different relaytransmission topologies, i) Serial , ii) Parallel , iii) Hydrid.

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Infrastructure Relay-Assisted MIMO

Destination 2

Destination 1

Source

2nd Ring of Relays

Serial Relay TransmissionParallel Relay Transmission

Topologies of Relay Transmission

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Serial Relay Transmission : It has multiple relays connected in series, which increases the transmission rate by increasing the transmission power.

DestinationSource Multiple Relays in Series

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Parallel Relay Transmission : It has multiple relays connected in parallel, which we can add multiple receiving stations. But its transmission rate is not much as serial relay transmission.

Source Destination

Multiple Relays in Parallel

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Hybrid Relay Transmission : It is the combination of serial and parallel relay transmission system, which will increases the transmission rate very much higher than any other infrastructure.

Source Destination

Relays in serial and parallel

Half Duplex Transmission

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Orthogonal phase 1 Orthogonal phase 2

Relay-receive phase Relay-Transmit phase

Advantages

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Provides high throughput even on high mobility.

Removes multipath fading.

High speed broadband transmission on GHz range.

Minimizes propagation delay.

Communication has been made very much effective.

Applications

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Because of its advantages, wireless communication has been attracted towards it.

Relay-Assisted system is planned to be used in :Mobile radio telephone standards, such as

3GPP , 3GPP2, (Generation Partnership Project),

HSPA+ ( High Speed Packet Access Plus) and in

LTE ( Long Term Evolution).

Conclusion

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Relay-Assisted MIMO Transmission strategy will contribute a lot in

Future

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Thank you