Benefits of Channel Diagonal Dominance to Cooperative MIMO Systems
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概要
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In cooperative multiple-input multiple-output (MIMO) cellular systems, a primary base station (BS), typically serving the cell to which the mobile station (MS) identifies, cooperates with K ≥ 1 secondary BSs, typically serving neighboring cells, to efficiently transmit data to a given cell-edge MS. Because achieving the capacity of a general MIMO channel is contingent upon the availability of channel state information (CSI) at the transmitter(s), cooperative MIMO schemes in the literature require K + 1 CSI feedback transmissions from the receiver (one to each of the K + 1 BSs), a signaling overhead that has been argued to be too costly to be worthwhile. Contrarily in this work, we propose the first capacity-approaching cooperative MIMO scheme where the CSI feedback cost is as little as in a point-to-point scenario: Only 1 CSI feedback (that to the primary BS). The proposed scheme is motivated by the fact that if the MIMO channel matrix is diagonally-dominant, CSI-blind uniform-power transmission and receiveside zero-forcing are optimal [Ginis & Cioffi, 2002]. Precisely, in the proposed scheme all K secondary BSs send the intended signal vector without precoding, whereas only the primary BS applies closed-loop MIMO precoding (such as beamforming) based on CSI (be it full or quantized (codebook-based)) fed back from the MS. Then, the primary BS applies a scaling factor to the precoded vector prior to transmission. This scalar is carefully designed such that the equivalent channel matrix at the receiver's side is diagonally dominant with probability arbitrarily close to 1, irrespective of the instantaneous realizations of the channels relative to the secondary BSs. Owing to this diagonal dominance, it is shown that simple zero forcing at the receiver's side suffices to achieve near-optimal signal detection. Even better, depending on the SNR regime, diagonal dominance need not be guaranteed all the time. The proposed cooperative MIMO scheme may find application in the 3GPP LTE-Advanced standard as a Coordinated Multi-Point (CoMP) transmission method.
- 一般社団法人電子情報通信学会の論文
- 2013-05-09
著者
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SOUIHLI Oussama
Wireless Communication System Laboratory (WCSL), KDDI R&D Labs
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HATAKAWA Yasuyuki
Wireless Communication System Laboratory (WCSL), KDDI R&D Labs
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KONISHI Satoshi
Wireless Communication System Laboratory (WCSL), KDDI R&D Labs
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