This document discusses MIMO (Multiple Input Multiple Output) technology. It begins by introducing MIMO, MISO and SIMO systems. It then presents the MIMO channel model as a matrix equation showing the relationship between the transmitted vector, channel matrix and received vector. It explains that MIMO can provide diversity gain through diversity techniques or multiplexing gain through spatial multiplexing techniques. This allows MIMO to improve reliability or data rates respectively. The document also discusses applications of MIMO such as in 3G, WiMAX and 4G LTE networks.

1. Vinod Raj Prajapat
14116075
ECE
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2. MIMO Technology
MIMO
MISO SIMO
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3. MIMO System model
Transmit
Vector
MIMO Channel Received vector
3
X1
X2
X3
.
.
XM
Y1
Y2
.
.
YN
M*1 Matrix N*1 Matrix
N*M Matrix
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4. Y=hx+n
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5. Why not single
antennas?
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6. 6/16

7. Issues in wireless communication
 Channel Capacity :- Shannon-Hartley Theorem
C=B*log2(1+SNR)
 Quality of Signal
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8. MIMO Technologies
 1 MIMO Diversity Technology
 2 MIMO Spatial Multiplexing Technology
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9. MIMO Diversity
 Diversity = NT*NR
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10. Spatial Technique
 Similar to OFDM
 Degree of freedom
= min(NT,NR)
 No additional cost of
Bandwidth
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11. Combination of Multiplexing
and Diversity Gain
For 6*4 model of antenna
Case 1:
Reliable Mode
Multiplexing Rate = 2
Diversity Gain = 3x2 = 6
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12. For a 6*4 antenaa
Case 2:
High Rate Mode –
Multiplexing Rate = 3 –
Diversity Gain = 2x1 = 2
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13. Advantages
 MIMO – implemented using diversity techniques –
provides diversity gain – Aimed at improving the
reliability
 MIMO – implemented using spatial-multiplexing
techniques – provides degrees of
freedom or multiplexing gain – Aimed
at improving the data rate of the system
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14. MIMO Capacity
 Capacity of MIMO system:
C=n*B*log2(1+SNR)
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15. APPLICATION
 HSPA + 3G
 WIMAX
 LTE4G (OFDM+MIMO)
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16. Thank you
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