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Achievable Rate Region of the Bidirectional Achievable Rate Region of the Bidirectional Buffer-Aided Relay Channel with Block Fading Buffer-Aided Relay Channel with Block Fading Vahid Jamali , Nikola Zlatanov , Aissa Ikhlef , and

SLIDE 1

Achievable Rate Region of the Bidirectional Buffer-Aided Relay Channel with Block Fading Achievable Rate Region of the Bidirectional Buffer-Aided Relay Channel with Block Fading

Vahid Jamali†, Nikola Zlatanov‡, Aissa Ikhlef‡, and Robert Schober†

†University of Erlangen-Nürnberg, Germany ‡University of British Columbia, Canada

December 31, 2014

SLIDE 2

System Model System Model

We consider a simple network in which user 1 and 2 exchange in- formation with the help of a relay node:

W12(i) W21(i)

W21(i)
W12(i)
W21(i)
W12(i)
W 12(i)
W 12(i)

X1(i) X2(i) Xr(i) Y1(i) Y2(i) Yr(i)

User 1 User 2 Relay Encoder Encoder Encoder Decoder Decoder Decoder B1 B2

h1(i) h1(i) h2(i) h2(i) Z1(i) Z2(i) Zr(i)

Half-duplex constraint for the nodes. Channels are reciprocal and block fading. The relay is equipped with buffers B1 and B2

Vahid Jamali†, Nikola Zlatanov‡, Aissa Ikhlef‡, and Robert Schober† – Achievable Rate Region of the Bidirectional Buffer-Aided Relay Channel with Block Fading 1 / 3 1 / 3

SLIDE 3

Possible Transmission Modes Possible Transmission Modes

User 1 User 1 User 2 User 2 Relay Relay

R1r(s) R2r(s) Rr1(s) Rr2(s)

C (P1(s)s1) C (P2(s)s2) C (Pr(s)s1) C (Pr(s)s2) C

P1(s)s1

1+P2(s)s2

C
P2(s)s2

1+P1(s)s1

Multiple-Access Mode

Broadcast Mode

Main Idea: The transmission modes, their achievable rates, and the nodes’ transmit powers can be employed adaptively by taking into account the channel state information.

Vahid Jamali†, Nikola Zlatanov‡, Aissa Ikhlef‡, and Robert Schober† – Achievable Rate Region of the Bidirectional Buffer-Aided Relay Channel with Block Fading 2 / 3 2 / 3

SLIDE 4

Numerical Results Numerical Results

Simulation Conventional Protocol Proposed Protocol

Pmax

= 10 dB Pmax

= 0 dB Pmax

= 10 dB Pmax

= 0 dB ¯ R21 (bits/symbol) ¯ R12 (bits/symbol) Per-Node Long-Term Power Constraint

0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5

Vahid Jamali†, Nikola Zlatanov‡, Aissa Ikhlef‡, and Robert Schober† – Achievable Rate Region of the Bidirectional Buffer-Aided Relay Channel with Block Fading 3 / 3 3 / 3