Iterative Power Allocation Scheme for MIMO Systems

Hui SHI  Tetsushi ABE  Hirohito SUDA  

IEICE TRANSACTIONS on Communications   Vol.E89-B    No.3    pp.791-800
Publication Date: 2006/03/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.3.791
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
power allocation,  MCS selection,  MIMO,  interference canceller,  equivalent SINR,  

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In closed-loop multiple-input and multiple-output space-division multiplexing (MIMO-SDM) systems, allocating power among multiple transmit data streams improves the channel capacity. However, the optimum power allocation values are not always available in closed-form. For instance, when we use transmission and reception schemes that do not transfer the MIMO channel into parallel orthogonal channels (e.g., eigen-mode SDM), the signal to interference plus noise ratio (SINR) of each data stream at the output of the receiver is not proportional to its corresponding transmit power. This feature makes it difficult to obtain the optimal closed-form power allocation value for each data stream. Thus, in this paper, we propose an iterative power allocation scheme for MIMO-SDM systems where the SINR is not proportional to the transmit power. Furthermore, we incorporate a transmit antenna selection scheme into the proposed power allocation scheme in order to attain further capacity enhancement. Computer simulation results are provided to show the effectiveness of the proposed power allocation schemes.