Network Coordinated Beamforming for Cell-Boundary Users: Linear and Nonlinear Approaches

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In this paper, low-complexity linear and nonlinear network coordinated beamforming (N-CBF) algorithms are proposed for the multi-cell downlink channel. We consider a downlink scenario with three base stations (BSs) equipped with one transmit antenna each and three mobile users, each of which has more than one receive antenna and is located on the cell-boundary. A single data stream is transmitted to all three cell-boundary users where each user receives his/her own independent data stream (called full broadcast channel), or where two users receive the same data stream while the third user receives a different data stream (called clustered broadcast channel). For full and clustered broadcast channel scenarios, we propose low-complexity linear N-CBF algorithms approaching the sum capacity realized by multi-cell dirty paper coding. We also propose low complexity nonlinear N-CBF algorithms that avoid power enhancement and maximize the effective channel gain for enhancing the bit error rate (BER). The impact of the number of receive antennas on the behavior of the proposed system is also discussed. Monte Carlo simulations are carried out to verify the sum rate and BER performances of the proposed algorithms.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2009-12
Language
English
Article Type
Article
Keywords

MULTIANTENNA MULTIUSER COMMUNICATION; VECTOR-PERTURBATION TECHNIQUE; MIMO BROADCAST CHANNEL; BLOCK DIAGONALIZATION; CAPACITY LIMITS; SUM-POWER; PART II; SELECTION; INTERFERENCE; OPTIMALITY

Citation

IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING, v.3, no.6, pp.1094 - 1105

ISSN
1932-4553
DOI
10.1109/JSTSP.2009.2035857
URI
http://hdl.handle.net/10203/96698
Appears in Collection
MA-Journal Papers(저널논문)
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