Post on 20-Apr-2018
2010 IEEE 71st Vehicular Technology Conference: VTC2010-Spring16-19 May 2010, Taipei, Taiwan
Power-Efficient Opportunistic Amplify-and-ForwardSingle-Relay Aided Multi-User SC-FDMA Uplink
Jiayi Zhang, Lie-Liang Yang, Lajos Hanzo
Communications Research GroupSchool of Electronics and Computer Science
University of Southampton, UK.Email: {jz07r, lly, lh}@ecs.soton.ac.uk
http://www-mobile.ecs.soton.ac.uk
Slide 1 - Outline
IEEE VTC2010-Spring in Taipei
Outline
o The state-of-art
o Relay assisted SC-FDMA system model
o Signal detection at the BS and results
o Opportunistic cooperative relaying and results
o Conclusions
Slide 2 - Key References
IEEE VTC2010-Spring in Taipei
Slide 2 - Key References
IEEE VTC2010-Spring in Taipei
Key References
o N. Benvenuto and R. Dinis and D. Falconer and S. Tomasin, “Single Carrier Modulation With NonlinearFrequency Domain Equalization: An Idea Whose Time Has Come–Again”, Proceedings of the IEEE,vol. 98, no. 1, pp. 69–96, Jan. 2010.
o J. Zhang, L.-L. Yang and L. Hanzo, “Multi-user performance of the amplify-and-forward single-relayassisted SC-FDMA uplink”, in Proceedings of IEEE VTC2009-Fall, 2009.
o L.-L. Yang, Multicarrier Communications, Wiley, 2009.
o H. G. Myung and J. Lim and D. J. Goodman, “Single carrier FDMA for uplink wireless transmission”,IEEE Vehicular Technology Magazine, pp. 30–38, Sept. 2006.
o A. Bletsas, A. Khisti, D. P. Reed and A. Lippman, “A simple cooperative diversity method based onnetwork path selection”, IEEE Journal on Selected Areas in Commuications, vol. 24, no. 3, pp.659–672, Mar. 2006.
o A. Sendonaris, E. Erikip and B. Aazhang, “User cooperative diversity - part I and II”, IEEE Transactionson Communications, vol. 51, pp. 1927–1948, Nov. 2003.
o D. Falconer, S. L. Ariyavisitakul, A. Benyamin-Seeyar and B. Eidson, “Frequency domain equalizationfor single-carrier broadband wireless systems”, IEEE Communications Magazine, pp. 58–66, Apr. 2002.
Slide 3 - The State-of-Art
IEEE VTC2010-Spring in Taipei
Slide 3 - The State-of-Art
IEEE VTC2010-Spring in Taipei
Slide 3 - The State-of-Art
IEEE VTC2010-Spring in Taipei
Motivation
o 3GPP LTE-Advanced prospective
o Green radio awareness - power efficiency
o High transmission throughput requirement: broadband rather than narrowband
o Problem: have to mitigate both the shadow and Rayleigh/Rician fading overdispersive channels
Slide 4 - The State-of-Art
IEEE VTC2010-Spring in Taipei
Slide 4 - The State-of-Art
IEEE VTC2010-Spring in Taipei
Slide 4 - The State-of-Art
IEEE VTC2010-Spring in Taipei
Slide 4 - The State-of-Art
IEEE VTC2010-Spring in Taipei
Why SC-FDMA?
o Carrier modulation aware transmitter design
• Power amplifier (PA) requires low peak-to-average power ratio (PAPR) due to its limitedlinear range
RF, PAS/PDSP
RF module, PADSP
S/P SubcarrierMapping IDFT PA
RF
Conventional multi−carrier (MC) modulation
Conventional single−carrier (SC) modulation
IDFTSubband
DFT MappingRFPA
DSP
DSPSC−FDMA: DFT−spread OFDMA structure
Orthogonal frequency−division multiple−access (OFDMA)
Signal
Time
and PA PAPRHardware
generation complexityflexibility
Single
SingleTD Low
High Low
LowFlexible
modulation
(FD)
(TD)−domain
−domainFrequency
−moudulusConstant
Constant−moudulusmodulation
RF module Configure
Reconfig
diversity
Yes
No
Single Low Low
ReconfigFlexible
TD Multiple Low High No
Depend onreceiver
Multi−path
U -point
U -pointN -point
Slide 5 - The State-of-Art
IEEE VTC2010-Spring in Taipei
Slide 5 - The State-of-Art
IEEE VTC2010-Spring in Taipei
Slide 5 - The State-of-Art
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Slide 5 - The State-of-Art
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Slide 5 - The State-of-Art
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o Digital signal processing (DSP) at receiver
• Conventional SC receiver: time-domain equaliser (TDE) with hundreds of filter taps incase of long channel impulse responses imposed by frequency-selective fading
RF TDE
SC−TDE
Detection
− high DSP complexity
Multi−tap
• SC-FDE receiver transforms the received signal to the frequency-domain, as in OFDMand employs single-tap multiplicative frequency-domain equaliser (FDE)
• SC-FDE receiver includes IDFT operation after conventional OFDM receiver
FDESingle−tap
IDFTDetectionRF DFT
SubbandDemapping
(K−1) other users
OFDMA(OFDM) style
− low DSP complexity
− multi−path diversityUser 1
SC−FDMA(SC−FDE) receiver
N -pointU -point
Slide 6 - The State-of-Art
IEEE VTC2010-Spring in Taipei
Slide 6 - The State-of-Art
IEEE VTC2010-Spring in Taipei
Slide 6 - The State-of-Art
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Slide 6 - The State-of-Art
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Slide 6 - The State-of-Art
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Slide 6 - The State-of-Art
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o Multiple-access oriented subband mapping schemes
Subbands
Subbands
Distributed
Localised User 1
User 2
User 3
• Distributed mode provides higher multi-path diversity gain than localised mode.
• Localised mode may achieve multi-user diversity when invoking channel-dependentscheduling, it is more suitable for a system in which a few users require high bit-rate.
• Interleaved mode is a special case of the distributed mode, where subbands arearranged equidistantly from each other.
• The transmitted TD signal of localised mode requires a few subcarriers, while forinterleaved mode only single carrier is used.
Slide 7 - The State-of-Art
IEEE VTC2010-Spring in Taipei
Slide 7 - The State-of-Art
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Slide 7 - The State-of-Art
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Slide 7 - The State-of-Art
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Slide 7 - The State-of-Art
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Slide 7 - The State-of-Art
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Slide 7 - The State-of-Art
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Why Cooperation?
o Aims
• Achieving energy/power efficiency
• Increasing system throughput
• Extending cellular coverage
• Supports multiple users
• Guarantees a given quality of service (QoS)
o Relay selection: whom to cooperate with?
• Fixed - aiming for cooperative diversity, fixed relaying gain
• Random - limited relaying gain and selection diversity gain
• Distance-dependent - aiming for relaying gain
• Channel-dependent - aiming for both relaying and selection diversity gains -Opportunistic Relaying
Slide 8 - Overview
IEEE VTC2010-Spring in Taipei
Slide 8 - Overview
IEEE VTC2010-Spring in Taipei
Slide 8 - Overview
IEEE VTC2010-Spring in Taipei
Slide 8 - Overview
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Slide 8 - Overview
IEEE VTC2010-Spring in Taipei
Slide 8 - Overview
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Slide 8 - Overview
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Slide 8 - Overview
IEEE VTC2010-Spring in Taipei
Opportunistic Amplify-and-Forward Cooperative Relaying forSC-FDMA Uplink
o Our proposed systems are capable ofproviding:• Multi-user (selection) diversity gain
• Cooperative (spatial) diversity gain
• Multi-path (frequency) diversity gain
o Additionally,• Free of multi-user interference (MUI)
and reduced AF relaying noise
• Low DSP complexity at the relay andBS
BS(destination)
MT(source)
MT(source)
MT(relay)
MT(relay)
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Source MT Transmitter
o DFT-spread-OFDMA style transmitter
DFT PowerAllocation
T−domain T−domainF−domain
1 2 3 4 5 6
IDFTSubbandMapping Add CPPPPk
xxx(f)k
FFFN
xxx(t)kxxx
(t)k
FFFHU PS,k
xxx(f)k sss
(t)S,k
• k-th user’s N consecutive TD symbol in the vector xxx(t)k
• Bandwidth (BW) expansion factor M supports a maximum of M users
• N -point FFT matrix FFFN offers a normalised BW of N per user
• U -point IFFT matrix FFFHU provides the total normalised BW of U = N×M
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Slide 10 - Relay Assisted SC-FDMA System Model
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Slide 10 - Relay Assisted SC-FDMA System Model
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o Total transmitted signal power Pt is normalised to unity,the source MT’s transmitted power PSt,k = εS,kαS,kPt,power sharing factor αS,k = αR,k = 0.5, in terms of Equal Power Allocation (EPA),Power Control Error (PCE): log-normal distributed samples with zero mean andvariance of σ2
ε , i.e. εS,k(dB) ∼ N (0, σ2ε ).
o Subband mapping matrix PPPk of the k-th user• Interleaved mode - achieves multi-path diversity gain
Pk,un =
8<: 1, for u = nM + k
0, otherwise
o Transmitted signal before inserting cyclic-prefix CP
sss(t)S,k =
√PSt,kFFFHUPPPkFFFNxxx(t)
k
xxx(f)k
xxx(f)k+1
x(f)k,n
x(f)k,n+1
x(f)k+1,n
x(f)k+1,n+1
x(f)k,n
x(f)k+1,n
x(f)k+2,n
x(f)k,n+1
x(f)k+1,n+1
x(f)k+2,n+1
xxx(f)k + xxx
(f)k+1
N
N
U = N×M
Interleaved subband mapping
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0 10 20 30 40 50 60 70−1.5
−1
−0.5
0
0.5
1
1.5SC−FDMA Discrete Time−Domain Waveform (N=8,M=8)
Normalised time
Am
plitu
de
signal point 1 real
signal point 1 imag
signal point 4 real
signal point 4 imag
−1.5 −1 −0.5 0 0.5 1 1.5−1.5
−1
−0.5
0
0.5
1
1.5SC−FDMA Time−Domain Constellations (BPSK)
I−real
Q−
imag
signal point 1signal point 4
0 10 20 30 40 50 60 70−1.5
−1
−0.5
0
0.5
1
1.5SC−FDMA Discrete Frequency−Domain Waveform (N=8,M=8)
Normalised frequency
Am
plitu
de
signal point 2 realsignal point 2 imagsignal point 3 realsignal point 3 imag
−1.5 −1 −0.5 0 0.5 1 1.5−1.5
−1
−0.5
0
0.5
1
1.5SC−FDMA Time−Domain Constellations (BPSK)
I−real
Q−
imag
signal point 2
signal point 3
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Channel Modelling
o 2D propagation map, direct link: source-destination (S-D),relaying links: source-relay (S-R), relay-destination (R-D)
o Reference distance: S-D link, normalised distances: δSR + δRD = 1
o Average path-loss: δ−ηSR and δ−ηRD
o Path-loss exponent η = 4, shadow fading ξ(dB) ∼ N (0, σ2ξ)
o Instantaneous path-loss: GSR = ξSRδ−ηSR and GRD = ξRDδ
−ηRD
RelaySource Destination
δSR δRD
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Assumptions
o BPSK modulation without channel coding
o AWGN CN (0, σ2N ) at the relay and BS
o Perfect Channel State Information at the Receiver (CSIR) of the BS
o Channel-Dependent Relay Selection (CD-RS) based on pilots
o Orthogonal subbands of the DFT-S-OFDM signals, avoiding MUI among the source MT
o A sufficiently long CP for each transmitted TD signal block, leading to zero inter-blockinterference (IBI)
o Each subband encounters independent and identically Rayleigh distributed block fading
o The K users’ signals are transmitted synchronously over the uplink channels
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Relaying Topologies
o Half-Duplex Time-Division Cooperation• Time slots
TS1: S→D and S→R, TS2: R→D
• Direct Transmission
rrr(t)SD =
K−1Xk=0
HHH(t)SD,ksss
(t)S,k + nnn
(t)D1
• Single-Dedicated-Relaying (SDR):K sources and K relays
rrr(t)
SR,k′ =√GSR
K−1Xk=0
HHH(t)SR,ksss
(t)S,k + nnn
(t)R,k
rrr(t)RD =
√GRD
K−1Xk′=0
HHH(t)
RD,k′sss(t)
R,k′ + nnn(t)D1
TS1
SK−1
TS1
D
R0TS2
S0
TS1
TS1TS2
RK−1
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Cooperative Strategies
o Amplify-and-Forward combined with subband-based FD equalisation andremapping
SubbandDemap
DFT
CP
Remove
SubbandMapping
IDFTAdd CP
Matrix
Amplify
21 24
17181920
22 23
Subband FFFU
βββ(f)k
rrr(t)SR,k
sss(t)R,k
TS1
TS2
PPPTk
PPPkFFFH
U
• Subband-specific equalisation and amplification matrix
βββ(f)k = diag{β(f)
k0 , β(f)k1 , · · · , β
(f)
k(N−1)},
where the n-th element is the specific gain factor of the n-th subband
β(f)kn =
qPRt,k/[PSt,kGSR|h(f)
SR,kn|2 + σ2N ].
• The transmitted signal of the k-th relay during TS2
sss(t)R,k =
pPSt,kGSRFFFHUPPPkβββ
(f)k HHH
(f)SR,kxxx
(f)k + nnn
(t)R,k
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Signal Processing at the BS’s Receiver
o MMSE Assisted Joint FD Equalisation and Combining (JFDEC)
SubbandDemap CP
Remove
789DFT
101112
U−pointN−pointIDFT
JFDECTS2:rrr
(t)RD
TS1:rrr(t)SD
PPPTk
yyy(f)D,k′yyy
(f)D,k′yyy
(t)D,k′
FFFHN w∗
D,k′(n+N)
w∗D,k′n
WWWHD,k′
FFFU
• The k′-th user’s received signals include direct and relay branches:
yyy(f)
D,k′ =pPSt,k′HHH
(f)
D,k′xxx(f)
k′ +nnn(f)D
• MMSE optimum weight matrixWWWD,k′ , jointly carry out single-tap FDE and diversitycombining of the direct and relay branches.
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o JFDEC-MMSE cont.
• The n-th and (n+N)-th element of the JFDECWWWD,k′ can be expressed as
wD,k′n =h
(f)
D0,k′n
σ2N
|h(f)
D0,k′n|2
σ2N
+|h(f)
D1,k′n|2
ND1,n+ P−1
St,k′
!−1
,
wD,k′(n+N) =h
(f)
D1,k′n
ND1,n
|h(f)
D0,k′n|2
σ2N
+|h(f)
D1,k′n|2
ND1,n+ P−1
St,k′
!−1
• TD decision variable vectoryyy
(t)
D,k′ = FFFHNWWWHD,k′yyy
(f)
D,k′
• The k′-th user’s overall received SINR
γk′ =
8<: 1
N
N−1Xn=0
24 1 + γSD,k′n+“γ−1SR,k′n + γ−1
RD,k′n
”−1
35−19=;−1
− 1
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Simulation Results
o Power reduction of JFDEC receiver by ignoring path-loss and shadowing
10-5
2
5
10-4
2
5
10-3
2
5
10-2
2
5
10-1
2
5
1
0 2 4 6 8 10 12 14 16 18 20
. ..
.
.
10-5
2
5
10-4
2
5
10-3
2
5
10-2
2
5
10-1
2
5
1B
ER
0 2 4 6 8 10 12 14 16 18 20
Eb/N0 (dB)
SC-FDMA AF (N=M=K=L=8)
SimulationSemi-analysis
. Non-Coop, GaussianNon-Coop, RayleighSDR, FDE-EGCSSR, FDE-EGCSDR, JFDECSSR, JFDEC
Power Reductionat BER=10
-4up to
2dB
4dB
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 19 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Opportunistic Cooperative Relaying
o Opportunistic relaying- allows a single relay to be selected from a cluster of J(J > 0) inactive MTs, the so-called Relay
Candidates (RC), depending on which MT provides for the best end-to-end link quality between the
source and destination
RelayCandidate
Source
Target Relay
Base Station
SU−RS MU−RS
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 20 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Relay Selection Schemes
o Single-User Relay Selection (SU-RS) for the SDR
• High number of idle MTs, more RCs may be considered
• Each source MT is capable of seeking a target relay from a cluster of J RCs which areindependent of the other source MT’s RC
j(opt)k = arg max
j∈[0,J−1]{γj,k}
o Multi-User Relay Selection (MU-RS) for the SDR
• Low number of inactive MTs results in an insufficient number of available RCs
• A cluster of K source MTs is assocated with a cluster of J(J≥K) RCs, the system onlyrequires a total of K relays
j(opt)k,i = arg max
j∈[0,J−1],k∈[0,K−1]{γj,k}
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 21 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Simulation Results
• BER performance of relay selection schemes- for path-loss exponent η = 4, 4 source MTs and total 16 RCs case
10-5
2
5
10-4
2
5
10-3
2
5
10-2
2
5
10-1
2
5
1
0 2 4 6 8 10 12 14 16 18 20
. ..
.
.
10-5
2
5
10-4
2
5
10-3
2
5
10-2
2
5
10-1
2
5
1B
ER
0 2 4 6 8 10 12 14 16 18 20
Eb/N0 (dB)
SC-FDMA SDR AF JFDEC (N=M=L=8, K= =4)
2=0dB,
2=0dB
2=4dB,
2=0dB
. Non-Coop, GaussianNon-Coop, RayleighEPA, RRSEPA, SU-RSEPA, MU-RS
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Slide 22 - Opportunistic Cooperative Relaying
IEEE VTC2010-Spring in Taipei
Simulation Results
• Power reduction of relay selection schemes- for path-loss exponent η = 4, 4 source MTs and total 16 RCs case
0
2
4
6
8
10
12
14
16
18
2 4 6 8 10 12 14 16 18 200
2
4
6
8
10
12
14
16
18T
rans
mit
pow
erpe
rbi
t(dB
)
2 4 6 8 10 12 14 16 18 20
Sum-Rate (bits/transmission)
SC-FDMA SDR AF JFDEC (N=M=L=8, K= =4)
2=0dB,
2=0dB
2=4dB,
2=0dB
Non-CoopEPA, RRSEPA, SU-RSEPA, MU-RS
Power reduction(without shadowing)
Power reduction(with shadowing)
4.75
dB
5dB
6.75
dB
8.08
dB7.
75dB
9.67
dB
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Slide 23 - Conclusions
IEEE VTC2010-Spring in Taipei
Conclusions
o Cooperative SC-FDMA was studied• Proposed diversity-optimised FDE receiver
– achieved 4dB power reduction
• Relay selection schemes for opportunistic relaying– Over fading channels free freom shadowing:
SU-RS provides 6.8dB power reductionMU-RS provides 7.8dB power reduction
– Over 4dB shadow fading channels:SU-RS provides 8dB power reductionMU-RS provides 9.7dB power reduction