Optimal and low complex suboptimal transmission schemes for MIMO-OFDM broadcast channels
Optimal and low complex suboptimal transmission schemes for MIMO-OFDM broadcast channels
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MIMO-OFDM 广播信道的最优和低复杂度次优传输方案
DOI：
10.1109/icc.2005.1494390
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
G. Wunder
中科院分区：
文献类型：
--
作者：
T. Michel;G. Wunder
在本文中，我们解决了当发射机和接收机具有完美的信道状态信息（CSI）时，具有总功率约束的多输入多输出（MIMO）正交频分复用（OFDM）广播信道的最优功率分配问题。我们推导了功率分配的最优条件，并提出了一种实现最优功率分配的有效算法。此外，我们还获得了频分多址（FDMA）传输和单用户传输最优的充要条件。事实证明，将多个用户分配到一个子载波通常是最优的。我们提出了一种使用纯 FDMA 方案的低复杂度算法，无需多次分配用户，并与完整容量区域相比来表征可实现的速率区域。
In this paper, we address the problem of optimal power allocation for multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) broadcast channels with a sum power constraint when transmitter and receiver have perfect channel state information (CSI). We derive optimality conditions for power allocation and present an efficient algorithm achieving the optimal power allocation. Furthermore, we obtain necessary and sufficient conditions for the optimality of frequency division multiple access (FDMA) transmission and single user transmission. It turns out that the assignment of multiple users to one subcarrier is optimal in general. We propose a low complexity algorithm using a pure FDMA-scheme without multiple assignment of users and characterize the achievable rate region in comparison to the complete capacity region.