This method used to improve the throughput of MIMO system by using spatial multiplexing and more number of sub carriers are added to avoid interference problem

1. E.G.S.PILLAY ENGINEERING COLLEGE
IMPROVING THE THROUGHPUT OF
MIMO Ad hoc NETWORKS WITH
SPATIAL MULTIPLEXING AND
SCHEDULING
FROM 3rd ECE & PRESENTED BY,
K.SHAMILI,S.SINTHANA

2. CONTENT
 INTRODUCTION
 METHODOLOGYAND
THROUGHPUT
 SCHEDULING AND ITS TYPES
 SPATIAL MULTIPLEXING AND ITS
CAPABILITY
 PACKET ERROR RATE
 SUMMARY
 OUTPUT AND CONCLUSION

3. INTRODUCTION
 Wireless network is a computer network that uses
wireless data connection between the network nodes.
 MIMO-OFDM is the foundation for most advanced
wireless LAN.
 Ad hoc network is LAN is built spontaneously as device
connect.

4. METHODOLOGY
 To improve the system throughput:
 Spatial multiplexing
 Scheduling
 More number of subcarriers are
introduced to overcome interference
problem

6. THROUGHPUT AND ITS
ANALYSIS
• Data transfer from one node to other node in
given amount of time.
• Measured in bits per seconds.
• System throughput is sum of data rate that
delivered to all terminals.

7. SCHEDULING
 Process of arranging, controlling and
optimizing work and workload in a
network process.
 To improve network throughput and
transmission quality.
 Transmitter nodes and their antenna are
selected opportunistically.

8. SCHEDULINGTYPES
TDMA SCHEDULING OPPORTUNISTIC SCHEDULING
 Frame divided into
transmission duration.
 Transmission rate within a
frame can vary.
 It exploit the multiuser
diversity.
 To enhance the system
throughput

9. SPATIAL MULTIPLEXING
 Transmission technique in MIMO
wireless communication.
 Requires transmit and receive antenna.
 No.of receiver antenna is smaller than
No.of transmitter antenna.
 Increases the capacity of MIMO.

11. SPATIAL MULTIPLEXING IN
MIMO

12. MULTIPLEXING CAPABILITY
OF MIMO CHANNEL
 With co-located transmit and receive
and far away scatters provides degree
of freedom gain.
 Each transmitted from different
transmit antenna in the same
frequency channnel.
 Receiver separate stream into parallel
channel.

14. PACKET ERROR RATE
•PER=no. incorrectly received data packet
Total no. of received packet
•Test the performance of access terminal receiver.
Incorrect packet
Atleast one bit is erroneous.

15. OUTPUT
0 5 10 15 20 25 30
2
2.2
2.4
2.6
2.8
3
3.2
3.4
SNR(db)
Throughput(bits/sec)
Throughput
subcarrier=64
subcarrier=128
2 3 4 5 6 7 8
0.5
1
1.5
2
2.5
3
3.5
X: 4
Y: 1.654
No. of users
Throughput(bits/sec)
Throughput
X: 6
Y: 2.405
Throughput
enhancement of 2×2
MIMO-OFDM using
TDMA and Opportunistic
scheduling as a function
of the number of users.
Throughput enhancement of
MIMO OFDM using
scheduling and spatial
multiplexing by varying SNR

16. SUMMARY
 In MIMO-OFDM has two parts
 OFDM modulator(transmitter side)
 OFDM demoudulator(receiverside)
APPLICATION
 It can provide reliable information at
same time.
 Transmission quality and throughput
also improved.

17. CONCLUSION
 MIMO throughput can be enhanced by varying
no. of users and SNR.
 This system depend on no. of antenna and user.
 Thus the throughput of MIMO-OFDM system is
improved by using TDMA and
OPPORTUNISTIC scheduling.

18. THANK YOU