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A Signal Space Diversity-Based TDBC Protocol in Two-Way Relay - - PowerPoint PPT Presentation

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A Signal Space Diversity-Based TDBC Protocol in Two-Way Relay Systems Hamza Umit Sokun Salama Ikki Mehmet Cagri Ilter Halim Yanikomeroglu Lakehead University Carleton University Canada Canada sikki@lakeheadu.ca {husokun, ilterm,

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A Signal Space Diversity-Based TDBC Protocol in Two-Way Relay Systems

Hamza Umit Sokun Mehmet Cagri Ilter Halim Yanikomeroglu

Carleton University Canada {husokun, ilterm, halim}@sce.carleton.ca

Salama Ikki

Lakehead University Canada sikki@lakeheadu.ca

IEEE Globecom, Dec. 2015, San Diego, CA, USA 1

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SLIDE 2

Two-Way Relaying

  • Interest in terminal relaying (D2D) in 5G standards.
  • Traditional one-way relay systems enable

spatial diversity at the expense of spectral efficiency due to half-duplex transmission.

  • Two-way Relaying  higher spectral efficiency

– Time Division Broadcast Protocol (TDBC) (Using direct link  higher reliability) – Best-relay selection

A B R1 A B R1

One-way Relaying Two-way Relaying

  • 1. slot
  • 2. slot
  • 3. slot

RL RL

IEEE Globecom, Dec. 2015, San Diego, CA, USA 2

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Signal Space Diversity

[1] J. Boutros and E. Viterbo, “Signal space diversity: a power-and-bandwidth-efficient diversity technique for the Rayleigh fading channels,” IEEE Trans. Info. Theory., Jul. 1998. [2] S. A. Ahmadzadeh, S. A. Motahari, A. K. Khandani, “Signal space cooperative communication,” IEEE Trans. Wireless Comm., Apr. 2010. [3] O. Amin, R. Mesleh, S. Ikki, M. Ahmed, and O. Dobre, “Performance analysis of multiple relays cooperative systems with signal space diversity,” IEEE Trans. Veh. Technol., Aug. 2015.

  • SSD [1] is a type of diversity that is

extracted in the modulation signal space.

  • In [2], the idea of SSD is applied

to cooperative schemes (with single relay) and the constellation expansion method is proposed.

  • Using the constellation expansion method proposed in [2], the

performance of multi-relay cooperative schemes is investigated in [3].

Constellation expansion [2]

IEEE Globecom, Dec. 2015, San Diego, CA, USA 3

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Novelty/Contributions

  • Two-way relaying + Signal space diversity

Good combination, because two end-sources exchange – Baseline: 2 symbols over 4 time-slots – Proposed: 4 symbols over 3 time-slots Adapt SSD signaling for two-way relaying (TDBC)

  • Obtained E2E error probability for arbitrary 2D constellations (as a

function of SNR), which accounts for all non-uniform rectilinear constellation caused by constellation rotation. This allows – choosing the best rotation angle as a function of SNR. – the joint optimization of rotation angle, and transmit powers of all nodes.

IEEE Globecom, Dec. 2015, San Diego, CA, USA 4

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System Model (1/4)

First symbol (belongs to the rotated constellation) Second symbol (belongs to the rotated constellation) The new constellation point that will be sent from source A (belongs to the expanded constellation),

In the first time slot: In the second time slot:

  • Original data symbols are rotated by a certain angle before being transmitted,

and then the end-sources and the relay cooperate for transmitting in-phase and quadrature components of two consecutive rotated symbols.

IEEE Globecom, Dec. 2015, San Diego, CA, USA 5

A B R1

  • 1. slot
  • 2. slot

RL A B R1 RL

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SLIDE 6

System Model (2/4)

In the third time slot: Since each node knows their data, the known parts will be removed:

IEEE Globecom, Dec. 2015, San Diego, CA, USA 6

A B R1

  • 3. slot

RL

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SLIDE 7

System Model (3/4)

Considering the direct and the cooperative links, the received signals at the end-source B: To detect the original message, the end-source B reorders the received components:

IEEE Globecom, Dec. 2015, San Diego, CA, USA 7

A B R1 RL

  • 1. slot
  • 3. slot
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SLIDE 8

System Model (4/4)

Finally, the end-source B applies ML detector on the reordered signals to detect the end-source messages:

IEEE Globecom, Dec. 2015, San Diego, CA, USA 8

1. 2.

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SLIDE 9

Error Rate Performance

where

End-to-End Average SER

IEEE Globecom, Dec. 2015, San Diego, CA, USA 9

[4] L. Szczecinski, H. Xu, X. Gao, and R. Bettancourt, “Efficient evaluation of BER for arbitrary modulation and signalling in fading channels,” IEEE Trans. Comm., vol. 55, no. 11, pp. 2061–2064, Nov. 2007. (Difference of the 𝑚-th and 𝑙-th symbols in the expanded constellation) (Complementary CDF of a bivariate Gaussian variable)

1) 2) 3) 4)

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Simulation Results (1/4)

  • Fig. 1. SER performance of the proposed TDBC (P-TDBC) in compared to

the conventional TDBC (C-TDBC) . (EA =EB =ER =E) IEEE Globecom, Dec. 2015, San Diego, CA, USA 10

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E/ N0 (dB) 7 PB (e)

C-TDBC with 16-QAM (Simulation) P-TDBC (θ = 10°) with QPSK (Simulation) P-TDBC (θ = 15°) with QPSK (Simulation) P-TDBC (θ = 40°) with QPSK (Simulation) P-TDBC (θopt) with QPSK (Simulation) Analytical

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SLIDE 11

Simulation Results (2/4)

  • Fig. 2. The impact of different rotation angles on the system performance

at the different SNR values. IEEE Globecom, Dec. 2015, San Diego, CA, USA 11

5 10 15 20 25 30 35 40 10

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θ (deg)

7

PB(e)

θopt= 30.28 θopt= 27.91 θopt= 27.66 θopt= 27.56 θopt= 27.53 θopt= 27.5 θopt= 28.52

E / N0 = 5 dB E / N0 = 10 dB E / N0 = 15 dB E / N0 = 20 dB E / N0 = 25 dB E / N0 = 30 dB E / N0 = 35 dB

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Simulation Results (3/4)

IEEE Globecom, Dec. 2015, San Diego, CA, USA 12

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ET=N0 (dB) P A(e) + P B (e)

Rotation angle with fixed power, GAR/GRB=-30 dB Joint rotation angle and power, GAR/GRB=-30 dB Rotation angle with fixed power, GAR/GRB=10 dB Joint rotation angle and power, GAR/GRB=10 dB

  • Fig. 3. Impact of joint optimization of rotation angle, and transmit powers

at all nodes on the system performance. (EA +EB +ER = ET, Emax= 0.8ET)

A B R1 A B R1

GAR/GRB =10 dB GAR/GRB =-30 dB

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SLIDE 13

Simulation Results (4/4)

  • Fig. 4. SER performance of the proposed TDBC (P-TDBC) in compared

to the conventional TDBC (C-TDBC) with reactive relay selection, when the number of relays is 3. (EA =EB =ER = ET/3) IEEE Globecom, Dec. 2015, San Diego, CA, USA 13

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ET =N0 (dB) PB(e) Reactive Relay-Selection with Three Relays

C-TDBC with 16-QAM (Simulation) P-TDBC (θ=10°) with 4-QAM (Simulation) P-TDBC (θ=15°) with 4-QAM (Simulation) P-TDBC (θ=20°) with 4-QAM (Simulation) P-TDBC (θopt) with 4-QAM (Simulation) Analytical

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Summary

  • A signal space diversity-based TDBC protocol is proposed.

– Higher spectral efficiency, – Higher spatial diversity.

  • Error rate performance analysis with arbitrary constellation is obtained.
  • Effect of rotation angle is investigated.
  • Joint effect of rotation angle and power allocation is shown.

IEEE Globecom, Dec. 2015, San Diego, CA, USA 14

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Future Works

  • Imperfect channel estimation
  • Impact of coding rate
  • Cognitive radio

IEEE Globecom, Dec. 2015, San Diego, CA, USA 15

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Thank you!

This work is supported in part by Huawei Canada Co., Ltd., and in part by the Ontario Ministry of Economic Development and Innovation’s ORF-RE (Ontario Research Fund - Research Excellence) program.

IEEE Globecom, Dec. 2015, San Diego, CA, USA 16