BICM-ID based Cooperative Network Shujaat Ali Khan Tanoli Advisor Dr. Nandana Rajatheva Telecommunications Asian Institute of Technology.

BICM-ID based Cooperative Network

Shujaat Ali Khan Tanoli

Advisor

Dr. Nandana Rajatheva

TelecommunicationsAsian Institute of Technology

Outline

Overview

Cooperative Network

Simulation Model

Theoretical Bounds

Results and discusion

Conclusion

Future Recommendations

List of Submissions

ReferencesAIT Masters Thesis Competition May 2009

3

　 Wireless Technology

We aiming toward the actualization of the fourth generation portable telephone, to achieve the rate of “giga b/s”.

1G

LTE

2G~64kbps

3G~2Mbps

4G~1Gbps

1980 1990 2000 2006~2010 2015

A s

ervi

ce s

yste

m

Year

3.9G~100Mbs

3.5G~14Mbps

High speed

Past Future

AIT Masters Thesis Competition May 2009

4

4th Generation

4G will appear as ultra high speed wireless network

Main Challenges

Power on terminals

Complexity

Spectral Efficiency

Example: DVD1 (approximately 4.5GB) download time

FDMA FDMA Above 27 hourAbove 27 hour (384kbps)(384kbps)

3.9G Mobile telephone 3.9G Mobile telephone 　　 6 6 minutes!!!minutes!!! (100Mbps)(100Mbps)

4G mobile telephone 4G mobile telephone 36 seconds!!!36 seconds!!!

(1Gbps) (1Gbps)


Reflection, Diffraction, and Scattering create several versions of the signal at the receiver.

These multipath cause a multipath fading.

5

Radio Wave Transmission

Huge reflector

Base Station

Scatterer

(cm)

(cm)

Carrier frequency 2GHz

Arrival wave number 16

Rec

eive

d po

wer

(dB

)

0 5 10 15 20 25 30 35 40 45 50 0 5

10 15

20 25

30 35

40 45

50

-30

-25

-20

-15

-10

-5

0

5

10


6

Multipath Fading

0 5 10 15 20 25 30 35 40 45 50 0 5

10 15

20 25

30 35

40 45

50

-30

-25

-20

-15

-10

-5

0

5

10

Received power

Low High

Received power fluctuates extremely by the fact that it moves through the multipath fading channel.

[cm][cm

]AIT Masters Thesis Competition May 2009

Multipath Fading

7

0 5 10 15 20 25 30 35 40 45 50 0 5

10 15

20 25

30 35

40 45

50

-30

-25

-20

-15

-10

-5

0

5

10

Low High

0 5 10 15 20 25 30 35 40 45 50 0 5

10 15

20 25

30 35

40 45

50

-30

-25

-20

-15

-10

-5

0

5

10

0 5 10 15 20 25 30 35 40 45 50 0 5

10 15

20 25

30 35

40 45

50

-30

-25

-20

-15

-10

-5

0

5

10

0 5 10 15 20 25 30 35 40 45 50 0 5 10 15 20 25 30 35 40 45 50

-30

-25

-20

-15

-10

-5

0

5

10

0 5 10 15 20 25 30 35 40 45 50 0 5 10 15 20 25 30 35 40 45 50

-30

-25

-20

-15

-10

-5

0

5

10

0 5 10 15 20 25 30 35 40 45 50 0 5 10 15 20 25 30 35 40 45 50

-30

-25

-20

-15

-10

-5

0

5

10

0 5 10 15 20 25 30 35 40 45 50 0 5 10 15 20 25 30 35 40 45 50-30

-25

-20

-15

-10

-5

0

5

10

Received power fluctuates extremely by the fact that it moves through the multipath fading channel.

Received power

[cm]

[cm]


8

Multipath Fading

Error

Error

Error

Received power

Low High

0 10 20 30 40 50

Rec

eive

d po

wer

[cm]


9

By increasing the antennas…


To overcome these issues and achieving the designed goals

The diversity techniques are the milestone in the developments of wireless communication.

Spectral efficiency can be improved by using multiple antenna (MIMO) on Transmitter and receiver.

10

By increasing the antenna…


11

Antenna Diversity Reception

[cm]0 10 20 30 40 50

Rec

eive

d po

wer

Multiple Antenna

An antenna spacing of several wavelengths is required.

At a frequency of 2 GHz, this amounts to several multiples of 15 cm.

NOT always practical for small handsets


13

Transmission Power

1km

1Wvoice 8kbps@2GHz

1km

To achieve high-speed data rate, very high transmission power is needed.

30m!

Data [email protected]

How Come!!!!!!!!!!Only near the BS

To send with the same 1W,…?


14

Co-channel Interference

Quality deterioration occurs

Frequency

f1 f2 f3


SOLUTION: • Cooperative Networks

•Multiple-hop Communication•Distributed Antenna Network

Multiple Hop Communication

15AIT Masters Thesis Competition May 2009

Distributed Antenna Network (DAN)

16AIT Masters Thesis Competition May 2009

Developments in Cooperative Network

Further improvement of cooperative networkcoded cooperative system (Nguyen et al., 2007)

To obtain coded cooperation diversity, (Razaghi et al.,2007) proposed a new coding scheme based on LDPC for cooperative networks system.


Bit-Interleaved Coded Modulation Zehavi in 1992 introduced BICM scheme by Introducing Bit interleaving between coding an modulation.

It is proved that BICM could improved the reliability of coded modulation over fading channel in order to enhance the coding diversity (Zehavi, 1992 ).



Taking full advantages of Code diversity by BICM and space diversity by MIMO, (Shahid and Rajatheva, 2008) and (Zummo et al., 2008) analyze the Bit interleaved space time codes and got improved performance.

We analyze the performance of BICM-ID based cooperative networks over AWGN channel, Rayleigh and Nakagami-m fading channels to get the benefits of both code and cooperation diversity.


Simulation Model


Error RateCalculation

R1

MRC

2/3 ConvEncoder

RandInterleaver

Randde-Interleaver

Decoder

BER_data Plot

Info

RandInterleaver

S/P P/S

M

M

M

S/P P/S

M

M

M

Cooperation

Comparisons


Proposed System

2-4dB Gain

BER BOUNDS


For Rayleigh Fading Channels

Results


BER BOUNDS


For Nakagami-m Fading Channels

Results


Conclusion

The theoretical BER bounds of the BICM-ID based cooperative system using BPSK and 8-PSK modulations over AWGN channels Rayleigh fading channels Nakagami-m fading channels

The numerical and simulation results shows that the proposed system obtain 2-5 dB of gain over the existing systems.


Future Recommendations


Different combinations of BICM-ID with other coding schemes i.e. LDPC and Turbo coding.

The decode-and-forward (DF) mode for relaying operation instead of AF.

User cooperation instead of fixed-relays.

Multi-user scenario considering the effect of interference in OFDMA based system.

The effect of other correlated and non correlated fading channels.

List of Submissions

Conference


“Capacity and performance analysis of space-time block coded MIMO-OFDM systems over rician fading channel,” (MWON 2008),Bangkok.

“Asymptotic BER bounds for BICM based multiple relay cooperative network under AWGN and relay fading channels," submitted to ChinaCom2009.

List of Submissions


“SER analysis of hybrid FDMA-TDMA based user cooperation diversity over Nakagami fading channels,” submitted to the 12th International Symposium on Wireless Personal Multimedia Communications (WPMC09).

“Trace-based Analysis for Campus-wide Wireless LAN over Advanced Training System," submitted to ICFIN 2009, China.

List of Submissions

Journal

Book Chapter


“Asymptotic BER bounds for BICM-ID based single-relay cooperative network over Nakagami-m fading channels,“ submitted to IEICE Communications Letter.

“Cooperative Networks,"Advanced Technologies, IN-TECH publisher, ISBN 978-953-7619-X-X, will be published in September 2009.

References

Caire G., Taricco G. and Biglieri E. Bit Interleaved coded modulation. IEEE Transaction of Information Theory , vol. 44 NO.3, May 1998.

Gradshteyn I. S., and Ryzhik I. M., Table of Integrals, Series, and Products, pp.341 sol.3.352.4-3.353.5, 7th ed. New York: Academic Press

Li X., Chindapol A. and Ritcey J. A. Bit-Interleaved coded modulation with Iterative Decoding and 8 PSK signaling. IEEE Transaction of Communication , vol. 50 NO.8, August 2002.

Nguyen H. T., Nguyen H. H., and Le-Ngoc T. Bandwidth-efficient Bit-interleaved Coded Cooperative Communications. Wireless Personal Communications, volume 46, Number 3 / August, 2008.


References

Razaghi Peyman, Aleksic Marko and Yu Wei. Bit-Interleaved Coded Modulation for the Relay Channel Using Bilayer LDPC Codes. 10th Canadian Workshop on Information Theory, 2007.

Shahid I., and Rajatheva N. Asymptotic BER Bounds for Iteratively Decoded Bit Interleaved Space Time Coded Modulation under Corelated Rayleigh and Rician Fading Channels. IEEE communication letters, vol. 12, NO. 10, October 2008.

Zehavi E. 8-PSK trellis codes for a rayleigh channel. IEEE Trans.Commun., vol. 40, pp. 873884,May 1992.

Zummo Salam A., Yeh Ping-Cheng, and Stark Wayne E. New Union Bound on the Error Probability of Bit-Interleaved Space-Time Codes with Finite Interleaver Sizes. IET Communication, 2008.


BICM-ID based Cooperative Network Shujaat Ali Khan Tanoli Advisor Dr. Nandana Rajatheva Telecommunications Asian Institute of Technology.

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