In this article, we propose a new criterion for a switching algorithm to be used in MIMO‐OFDM systems. The switching algorithm, which selects between spatial multiplexing and MIMO diversity using the Demmel condition number as selection metrics, is first analyzed. Then, we show the limitation of this criterion, when increasing the receive antenna number. As a solution, we propose multiantenna processing and SNR switching criterion as a novel selection metric. The channel between the transmitter and the receiver is assumed a Rayleigh‐fading channel. Simulations results show that the proposed switching algorithm improves the performances in terms of bit error rate (BER) for symmetric and asymmetric MIMO systems. The gain is about 3 dB at BER = 10−4 in (4×4) architecture and 2 dB at BER = 10−4 in (3×2) architecture.

中文翻译：

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一种用于对称和非对称 MIMO 架构的新型 OFDM 切换算法

在本文中，我们为 MIMO-OFDM 系统中使用的切换算法提出了一个新标准。首先分析使用Demmel 条件数作为选择度量在空间复用和MIMO 分集之间进行选择的切换算法。然后，当增加接收天线数量时，我们展示了该标准的局限性。作为一种解决方案，我们提出了多天线处理和 SNR 切换标准作为一种新颖的选择指标。发射机和接收机之间的信道假定为瑞利衰落信道。仿真结果表明，所提出的切换算法提高了对称和非对称 MIMO 系统在误码率 (BER) 方面的性能。在 (4×4) 架构中 BER = 10−4 时增益约为 3 dB，在 (3×2) 架构中 BER = 10−4 时增益约为 2 dB。