control channel design for many-antenna mu- mimo jihoon yun c. shepard, a. javed, and l. zhong,...
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Control Channel Design for Many-
Antenna MU-MIMOJihoon Yun
C. Shepard, A. Javed, and L. Zhong, “Control Channel Dsign for Many-Antenna MU-MIMO”, Mobicom 2015
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Introduction
• The lack of an efficient and reliable control channel in current MU-MIMO architectures.• In existing systems all control channel operations are performed in
the no-CSI mode -> the operational range is limited
• Use a combination of open-loop beamforming and coding gains -> reduce the range gap between the CSI and no-CSI modes• Provide their control channel design for many-antenna MU-MIMO
C. Shepard, A. Javed, and L. Zhong, “Control Channel Dsign for Many-Antenna MU-MIMO”, Mobicom 2015
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Background: Multiple-Input Multiple-Output• Multiple-Input Multiple-Output(MIMO)• Single-User MIMO (SU-MIMO)• Multi-User MIMO (MU-MIMO)
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Background: Beamforming
• Beamforming• Utilizes multiple antennas transmitting at the same frequency to realize
directional transmission• Open-loop Beamforming : uses precomputed beamforming weights without
knowledge of the user’s location• Closed-loop Beamforming(adaptive beamforming) : employs channel state
information (CSI) to calculate the beamweights.
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Background: Control Channel
• Performs operations required to setup data communication• Synchronization
• Since nodes in wireless networks do not share oscillators , their time-frequency reference is subject to drift
• Association• Before a user can transmit or receive data, it must first identify the nearby base stations, select one,
then connect to it. • Beacon: base stations typically transmit a unique identifier
• Channel state information(CSI) Collection• Pilot : to obtain CSI, the transmitter sends a pre-known sequence
• Paging and Random Access• Paging : the control channel handles notifying users when they have incoming data• The control channel handles coordinating users to randomly access the network when they have
outgoing data
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Gap grows between no-CSI and CSI mode
Traditional Sync MU-MIMO
M Base Station AntennasK Users
M2/K
M
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Open-Loop Beamforming
• Sweep extra-long synchronization sequences across the coverage area
Coverage Gap
Traditional Sync
Open-loop Beam
MU-MIMO
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Coding Gain
• Achieved by sending a signal over a longer period of time
Traditional Sync
Open-loop Beam
MU-MIMO
Faros
Full Coverage
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Control Channel Design
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Experiment Setup
’’’’’’
Base-station LocationsUser Locations
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Beacon Performance
Method
Beac
on S
wee
ps D
etec
ted
(%)
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Beacon Performance
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Summary
• A fundamental re-design of the wireless control channel in many-antenna MU-MIMO systems• Improve the range, or transmission efficiency by over 40dB
• Most of experiments held in stationary status.(Briefly explain mobility but there is no detailed explanation.• For mobile network(LTE), the mobility have to be considered.