Cooperative Communication in Wireless Networks
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Transcript of Cooperative Communication in Wireless Networks
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Cooperative Communication inWireless Networks
Aria Nosratinia, University of Texas, Dallas, Todd E. Hunter, Nortel NetworksAhmadreza Hedayat, University of Texas, Dallas
Speaker : Ching-Chung Lin
IEEE Communications Magazine October 2004
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Outline
Introduction Assumption Cooperative Communication Performance Conclusion
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Introduction
The mobile wireless channel suffers from fading signal attenuation can vary significantly
Transmitting independent copies of the signal from different location generates spatial diversity effectively combat fading
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A
B C
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Assumption
One antenna Each host have one partner
may be assigned mutually by the base station Each host is a both a user and a relay One cooperator forward “overheard” information
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Cooperative Communication
Amplify and forward Decode and forward Coded cooperation
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Cooperative Communication
Amplify and forward Decode and forward Coded cooperation
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Amplify and forward
Assumption Each user receives a noisy version of the signal transmitted by
its partner The base station knows the interuser channel coefficients to do
optimal decoding
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A
B C
User
relay
destination
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Cooperative Communication
Amplify and forward Decode and forward Coded cooperation
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Decode and forward
Assumption each user
transmits its own bits detects the other user’s second bit
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Decode and forward
symbol definition each user has its own spreading code
C1(t) C2(t) two user’s data bits
Signal amplitudes
i : transmission interval
j : power level
ex :
)(1nb )(
2nb
j ia
2 1a 1 2a
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Decode and forward
)]()( , )( , )([)( 2)2(
2141)2(
1131)2(
1121)1(
1111 tcbatcbatcbatcbatX
)]()( , )( , )([)( 2)2(
2241)2(
1232)2(
2222)1(
2212 tcbatcbatcbatcbatX
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Decode and forward
)]()( , )( , )([)( 2)2(
2141)2(
1131)2(
1121)1(
1111 tcbatcbatcbatcbatX
)]()( , )( , )([)( 2)2(
2241)2(
1232)2(
2222)1(
2212 tcbatcbatcbatcbatX
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Decode and forward
)]()( , )( , )([)( 2)2(
2141)2(
1131)2(
1121)1(
1111 tcbatcbatcbatcbatX
)]()( , )( , )([)( 2)2(
2241)2(
1232)2(
2222)1(
2212 tcbatcbatcbatcbatX
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Decode and forward
J. N. Laneman, G. W. Wornell, and D. N. C. Tse,
“An Efficient Protocol for Realizing Cooperative Diversity in Wireless Networks,”
Proc. IEEE ISIT, Washington, DC,June 2001 When the SNR is high , user enter into cooperative mode. When the SNR is low , user enter into noncooperative mode.
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Cooperative Communication
Amplify and forward Decode and forward Coded cooperation
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Coded cooperation
each user decode the transmission of its partner data is encoded into a codeword
N bits = N1 + N2
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A
B C
N1 bits : userA’s data
Frame1
N2 bits : userA’s data
Frame2
N1 bits : userB’s data
Frame1
N2 bits : userB’s data
Frame2
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A
B C
N1 bits : userA’s data
Frame1
N1 bits : userB’s data
Frame1
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Performance
rate-compatible punctured convolutional (RCPC) codes
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User 1
User 2
destination
SNR=X
SNR=X
SNR=X
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Performance
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User 1
User 2
destination
SNR=X+10
SNR=X
SNR=X
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Performance
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conclusion
Results to date are indicative of a promising future for cooperative communication.
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Thank You
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英 文: Block Error Rate (BKER, BLER) 台 灣: 塊誤率 大 陸: N/A 修訂時間: 2000/9/13
字組錯誤率,數據組出錯率,信息組差錯率錯誤地接收方塊 (Blocks) 的數目和送出方塊總數目的比率,來衡量塊處理效果。