Sum capacity of MIMO Gaussian broadcast channels with channel energy constraints

被引：0

作者：

Wireless Networking and Communications Group, Dept. of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712, United States ^{[1
]}

机构：

[1] Wireless Networking and Communications Group, Dept. of Electrical and Computer Engineering, The University of Texas at Austin, Austin

来源：

IEEE Commun Lett | 2006年 / 6卷 / 471-473期

关键词：

Capacity; Frobenius norm; MIMO;

D O I：

10.1109/LCOMM.2006.1638619

中图分类号：

学科分类号：

摘要：

The motivation of this paper is to find the class of channels that provides the best sum capacity of a MIMO Gaussian broadcast channel with both transmit power and channel energy constraints when Nt ≥ KNr, where NNt, Nr and K denote the number of transmit antennas, the number of receive antennas, and the number of users in the system, respectively. The best sum capacity is achieved when the user channels are mutually orthogonal to each other. For each individual user, equal energy is distributed to all non-zero spatial eigenmodes. Further, we optimize the number of non-zero eigenmodes for all users and the optimal power distribution among users. Although, we only study the case of Nt ≥ KNr in this paper, we conjecture that similar results still hold for Nt ≤ KNr. The characteristics of the optimal channels can be used to direct antenna configurations. © 2006 IEEE.

引用

页码：471 / 473

页数：2

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