Title :
MIMO Systems with Arbitrary Antenna Array Architectures: Channel Modeling, Capacity and Low-Complexity Signaling
Author :
Raghavan, Vasanthan ; Poon, Ada S Y ; Veeravalli, Venugopal V.
Author_Institution :
Univ. of Illinois at Urbana-Champaign, Urbana
Abstract :
The focus of this work is on multi-antenna systems with arbitrary antenna array architectures. First, we propose a multi-antenna channel model that encompasses many of the existing models and study the capacity of such systems. We show that capacity is achieved by pre-nulling the input signals along the transmit array manifold with a transmit-SNR dependent rank and power control. The rank of the optimal signaling scheme is monotonically non-decreasing as SNR increases. Thus our results generalize many known results in this area. Further, we compute two explicit SNR values, rholow below which rank-1 signaling and rhohigh above which full-rank signaling are near-optimal, respectively. Finally, with a focus on low-complexity scalar signaling schemes, we propose a sub-optimal beamforming approach that minimizes the statistical feedback necessary to implement such schemes. While almost all works in this area assume a genie-aided statistics acquisition process, we show that the proposed scheme trades-off performance with statistical feedback overhead attractively.
Keywords :
MIMO communication; antenna arrays; array signal processing; telecommunication channels; MIMO systems; arbitrary antenna array architectures; channel modeling; genie-aided statistics acquisition process; optimal signaling scheme; power control; scalar signaling schemes; statistical feedback; sub-optimal beamforming approach; transmit array manifold; transmit-SNR dependent rank; Antenna arrays; Argon; Channel capacity; Feedback; MIMO; Power system modeling; Scattering; Statistics; Transmitters; Transmitting antennas;
Conference_Titel :
Signals, Systems and Computers, 2007. ACSSC 2007. Conference Record of the Forty-First Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
978-1-4244-2109-1
Electronic_ISBN :
1058-6393
DOI :
10.1109/ACSSC.2007.4487419