Joint Beamforming and Power Control for Multiantenna Relay Broadcast Channel With QoS Constraints

This paper studies the two-hop relay broadcast channel (BC) for a relay-assisted wireless cellular network where the multiuser independent downlink signals from the base station (BS) are first transmitted to a fixed relay station (RS), and then forwarded by the RS to multiple mobile users. Assuming...

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Veröffentlicht in:IEEE transactions on signal processing Jg. 57; H. 2; S. 726 - 737
Hauptverfasser: Rui Zhang, Rui Zhang, Chin Choy Chai, Chin Choy Chai, Ying-Chang Liang, Ying-Chang Liang
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York, NY IEEE 01.02.2009
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Algorithms
Applied sciences
Array signal processing
Base stations
Beamforming
Broadcasting
Cellular communication
Channels
Coding, codes
Constraint optimization
convex optimization
Detection, estimation, filtering, equalization, prediction
Downlink
eigenmode switching
Exact sciences and technology
Information, signal and communications theory
Iterative algorithms
Land mobile radio cellular systems
Miscellaneous
multiple-input multiple-output (MIMO)
nonregenerative relay
Power control
Relay
relay broadcast channel
Relays
Signal and communications theory
Signal processing
Signal to noise ratio
Signal, noise
space-division-multiple-access (SDMA)
Stations
Studies
Telecommunications and information theory
Relay
Noise reduction
Base station
Wireless telecommunication
Downlink
Iterative method
Cell network
relay broadcast channel
Beam forming
Optimization
Coding
Broadcast channels
Mobile radiocommunication
Multiple access
space-division-multiple-access (SDMA)
eigenmode switching
multiple-input multiple-output (MIMO)
Interference suppression
Beamforming
Relay channel
Power consumption
Power control
Telecommunication network
Signal processing
Wireless network
convex optimization
nonregenerative relay
Signal to interference plus noise ratio
Service quality
Signal to noise ratio
ISSN:1053-587X, 1941-0476
Online-Zugang:Volltext
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Zusammenfassung:This paper studies the two-hop relay broadcast channel (BC) for a relay-assisted wireless cellular network where the multiuser independent downlink signals from the base station (BS) are first transmitted to a fixed relay station (RS), and then forwarded by the RS to multiple mobile users. Assuming both the BS and RS are equipped with multiantennas, we study the joint optimization of linear beamforming and power control at the BS and RS so as to minimize their weighted sum-power consumption under the user minimum signal-to-interference-noise-ratio (SINR) - quality-of-service (QoS) - constraints. We apply two well-known criteria in the literature, namely, the ldquoSINR balancingrdquo and the ldquochannel-inversion,rdquo for the design of linear precoding in the traditional nonrelay-assisted multiantenna BC to the relay-assisted multiantenna BC. First, a convergence-ensured iterative SINR-balancing algorithm is proposed to successively in turn optimize the transmit parameters at one station (BS or RS) with those at the other station being fixed. Second, a joint BS and RS channel-inversion algorithm is proposed together with a novel technique, termed ldquoeigenmode switching,rdquo at the RS to reduce the power penalty of the channel inversion. Simulation results show that the proposed joint beamforming and power control schemes provide substantial power savings to achieve the assigned user QoS constraints.
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ISSN:1053-587X
1941-0476
DOI:10.1109/TSP.2008.2008254