Energy-Efficient, Large-scale Distributed Antenna System (
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Energy-Efficient, Large-scale Distributed Antenna System ( L-DAS ) under revision for JSTSP Parts of this work have been presented at the IEEE GLOBECOM, Atlanta, GA, USA, Dec. 2013. Jingon Joung , Yeow Khiang Chia, Sumei Sun Modulation and Coding Department

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Jingon Joung , Yeow Khiang Chia, Sumei Sun Modulation and Coding Department

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Jingon joung yeow khiang chia sumei sun modulation and coding department

Energy-Efficient, Large-scale Distributed Antenna System (L-DAS)under revision for JSTSP Parts of this work have been presented at the IEEE GLOBECOM, Atlanta, GA, USA, Dec. 2013

Jingon Joung, Yeow Khiang Chia, Sumei Sun

Modulation and Coding Department

Institute for Infocomm Research, A*STAR

Internal Meeting with Prof. Moe Z. Win

14 January 2014


Motivation

Motivation

  • To achieve high spectral efficiency (SE) and energy efficiency (EE)

  • For high SE

    • MU-MIMO: LTE-A beyond Re-7

    • Distributed systems: e.g., coordinated multi-point operation (CoMP), LTE-A Re-11

    • Massive (large) MIMO: recent trend

  • For high EE

    • Power control (PC): efficient-power transmission


L das system

L-DAS System

BBU: baseband unit

(signal processing center)

IAD: intra-ant distance

U users

M antennas

H: U-by-M MU-MIMO ch. matrix

S: M-by-U binary AS matrix

W: M-by-Uprecoding matrix

P: U-dim diagonal PC matrix

x: U-by-1 symbol vector

n: U-by-1 AWGN vector


Objectives contribution

Objectives & Contribution

  • Study an L-DAS

  • Provide a practical power consumption model

  • Formulate an EE maximization problem

  • Resolve issue on huge signaling, complexityrequirement:

    • Antenna selection(AS) method

    • Threshold-based user-clustering method

    • MU-MIMO precoding method

    • Optimal and heuristic power control methods

  • Verify the EE merit of L-DAS


Power consumption model

Power Consumption Model

Power consumption

TPI(transmit power independent) term

TPD (transmit power dependent) term

eRF (electric RF)

oRF (optical RF)


Jingon joung yeow khiang chia sumei sun modulation and coding department

Cont.

  • TPD term

  • TPI term

Pcc1: eRF

Pcc2: per unit-bit-and-second of oRF

Ru: target rate of user u

β>=0: implies overhead power consumption of MU processing

compared to SU-MIMO


Ee maximization problem

EE Maximization Problem


Splitting problem

Splitting Problem

  • Channel-gain-based greedy AS: RSSI

  • Min-dist-based greedy AS: localization Info.


Jingon joung yeow khiang chia sumei sun modulation and coding department

Cont.

  • SINR-threshold-(γ)-based clustering

    • SINR btw users in the same cluster < γ

    • SINR btw users in diff clusters > γ

γ = 25dB

γ = 32dB


Per cluster optimization

Per-Cluster Optimization

  • Now, AS matrix is given

  • For fixed PC matrix,

    • ZF-MU-MIMO precoding matrix


Jingon joung yeow khiang chia sumei sun modulation and coding department

Cont.

  • Now, AS and precoding matrices are given

  • Assumption: ICI is negligible

    • Optimal for MU: using bisection algo, convex feasibility test

    • Heuristic for MU and optimal for SU:


Numerical results

Numerical Results

Single cell

Single antenna for each user

No adaptation for

- # of antennas for each user

- clustering threshold


Remaining issues for l das

Remaining Issues for L-DAS

  • Deployment, implementation, and operation

    • Cell planning,

    • Regular/irregular deployment of antennas

    • Synchronization for large cluster

    • Robustness against CSI error

    • Infrastructure cost for wired optical fronthaul

    • Comparative, quantitative study of L-DAS and L-CAS considering Capex and Opex


Jingon joung yeow khiang chia sumei sun modulation and coding department

Cont.

  • Iteration for

    • # of antennas

    • clustering threshold


Jingon joung yeow khiang chia sumei sun modulation and coding department

Cont.

  • Example at cell boundary of two cells

  • Outage  increase # of active DAs

Circle: Non-outage user

Circle color stands for the cluster/DA

X: Deactivated DA

Colored Square:

Active distributed antenna (DA)

Colored Thick Circle: Active DA

allocated to the outage user

Black Dot: outage user

Circle color stands for the cluster/DA


Jingon joung yeow khiang chia sumei sun modulation and coding department

Cont.

  • Outage 


Jingon joung yeow khiang chia sumei sun modulation and coding department

Cont.

  • Increase clustering threshold γ  outage 


Jingon joung yeow khiang chia sumei sun modulation and coding department

Cont.

  • Increase # of active DAs  outage 


Jingon joung yeow khiang chia sumei sun modulation and coding department

Cont.

  • Increase clustering threshold γ  outage 


Jingon joung yeow khiang chia sumei sun modulation and coding department

Cont.

  • Increase # of active DAs  outage 


Jingon joung yeow khiang chia sumei sun modulation and coding department

Cont.

  • No outage: threshold update (2,3) times


Jingon joung yeow khiang chia sumei sun modulation and coding department

Cont.

  • Demo

  • cell_no_outage


Jingon joung yeow khiang chia sumei sun modulation and coding department

Cont.

  • Demo

  • cell_outage


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