Orthogonal frequency division multiplexing (OFDM) is a multicarrier transmission system that can achieve high data rate over wireless channels. At the same time, multiple input multiple output OFDM (MIMO-OFDM) in wireless communication systems has been exposed to offer significant improvement over wireless technology by providing transmit diversity. It has become a promising technique for high-performance 5G broadband wireless communications. However, the main problem associated with MIMO-OFDM is that its signal exhibits high peak-to-average power ratio (PAPR), which causes nonlinear distortion and consequently performance degradation. Besides, PAPR carries weaknesses such as an increase in power consumption of high power amplifier (HPA) and analog to digital converter (ADC). Thus, 5G base stations will push up power requirements because energy consumption grows with the number of transceiver elements. So, mobile operators must find the right compromise that, on the one hand, guarantees a certain level of performance to a data flow, and, on the other hand, the energy cost generated for the deployment of the network. For this, as part of the management of power consumption, we propose MIMO constant envelope OFDM (MIMO-CE-OFDM) technique. In this work, we used MIMO-CE-OFDM to mitigate the nonlinear effect of HPA and ADC. To perform practical simulations, we have used COST 2100 MIMO channel model. In this paper, a MIMO-CE-OFDM system has been presented and analyzed under COST 2100 channel model conditions. Simulation results are given to illustrate the performance of [Formula: see text] MIMO-CE-OFDM in the presence of both HPA and ADC nonlinearity. This work shows that the effect of nonlinearity is shown to be negligible on MIMO-CE-OFDM signal.

中文翻译：

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在 5G 应用中使用恒定包络 OFDM 补偿 MIMO-OFDM 系统中的非线性失真效应

正交频分复用 (OFDM) 是一种多载波传输系统，可以在无线信道上实现高数据速率。同时，无线通信系统中的多输入多输出 OFDM (MIMO-OFDM) 已被曝光，通过提供发射分集来显着改进无线技术。它已成为一种很有前途的高性能 5G 宽带无线通信技术。然而，与 MIMO-OFDM 相关的主要问题是其信号表现出较高的峰均功率比 (PAPR)，这会导致非线性失真，从而导致性能下降。此外，PAPR 还存在诸如高功率放大器 (HPA) 和模数转换器 (ADC) 的功耗增加等缺点。因此，5G 基站将推高功率要求，因为能耗随着收发器元件的数量而增长。因此，移动运营商必须找到正确的折衷方案，一方面保证数据流的一定性能水平，另一方面保证网络部署产生的能源成本。为此，作为功耗管理的一部分，我们提出了 MIMO 恒定包络 OFDM (MIMO-CE-OFDM) 技术。在这项工作中，我们使用 MIMO-CE-OFDM 来减轻 HPA 和 ADC 的非线性效应。为了进行实际模拟，我们使用了 COST 2100 MIMO 信道模型。本文介绍并分析了 COST 2100 信道模型条件下的 MIMO-CE-OFDM 系统。给出仿真结果来说明[公式：见文本] MIMO-CE-OFDM 同时存在 HPA 和 ADC 非线性。这项工作表明非线性效应对 MIMO-CE-OFDM 信号的影响可以忽略不计。