An approach to enhance antenna spectral efficiency is proposed based on combining spacetime electromagnetic (EM) models of Tx/Rx antennas with orthogonal frequency division multiaccess (OFDM), leading to the EM‐OFDM, a technology capable of removing intersymbol interference (ISI) in high‐data rate communication links caused by the EM‐induced distortion antenna effects. The proposed approach differs from traditional OFDM in wireless communication in several aspects. First, the technique suggests a new decoupling approach by treating each given antenna transreceive device pair as a “stand‐alone channel” with its own distortion mechanisms considered separately from the propagation channel. Moreover, the deterministic distortion caused by the nonflat pure antenna EM filtration effects is exploited to carefully design a specialized OFDM transmission techniques based on the antenna parameters, not the multipath fading channels often invoked in conventional uses of OFDM methods. (The EM‐OFDM, however, can be combined with a traditional OFDM later if fading channels are present.) In this manner, a more efficient implementation of the wireless link equalization strategy may be enacted since the EM antenna origin of ISI is very different from the traditional propagation channel one. As a proof of concept, the proposed EM‐OFDM method is implemented for a single‐input‐single‐output link comprised of half‐wavelength linear wire antennas. A careful use of finite difference time‐domain to provide EM data allowed the construction of 64 decoupled “pure antenna OFDM subchannels.” Simulation results suggests that the antenna‐based OFDM system is capable of completely neutralizing all ISI effects caused by the limited antenna matching bandwidth of the transreceive wires, therefore, supporting considerably higher data rates with low symbol error rate (SER). A concrete evaluation of the SER using quadrature phase‐shift keying (QPSK) digital carrier modulation resulted in an increase of the effective antenna digital communication spectral efficiency by ratios up to 300%. Moreover, the EM‐OFDM error rate was found to be close to the ideal QPSK level or the maximum possible theoretical limit. Thus, combining detailed EM knowledge with standard signal processing methods can lead to considerable improvement in system design without modifying the antenna physical layout. The proposed approach is expected to play a role in the forthcoming 5G/6G and millimetre wave technology systems currently under development where there is a trend toward integration of EM and digital signal processing at the physical layer level.

中文翻译：

---

使用基于天线的正交频分多址技术增强频谱效率

通过将Tx / Rx天线的时空电磁（EM）模型与正交频分多址（OFDM）相结合，提出了一种提高天线频谱效率的方法，从而提出了一种EM-OFDM技术，该技术能够消除天线中的码间干扰（ISI）。电磁感应失真天线效应引起的高数据速率通信链路。所提出的方法在几个方面与无线通信中的传统OFDM不同。首先，该技术提出了一种新的去耦方法，将每个给定的天线收发设备对视为“独立信道”，并考虑其自身的失真机制，将其与传播信道分开考虑。此外，因此，利用非平坦纯天线EM滤波效应引起的确定性失真来精心设计基于天线参数的专用OFDM传输技术，而不是通常使用OFDM方法的常规方法调用的多径衰落信道。（但是，如果存在衰落信道，则以后可以将EM-OFDM与传统OFDM组合。）通过这种方式，由于ISI的EM天线起源非常不同，因此可以制定更有效的无线链路均衡策略实施方案来自传统的传播渠道之一。作为概念验证，建议的EM-OFDM方法用于由半波长线性线状天线组成的单输入单输出链路。仔细使用有限差分时域提供EM数据，可以构造64个解耦的“纯天线OFDM子信道”。仿真结果表明，基于天线的OFDM系统能够完全抵消由收发线的有限天线匹配带宽引起的所有ISI效应，因此，可以以较低的符号误码率（SER）支持更高的数据速率。使用正交相移键控（QPSK）数字载波调制技术对SER进行的具体评估导致有效天线数字通信频谱效率提高了300％。此外，发现EM-OFDM错误率接近理想的QPSK水平或最大可能的理论极限。从而，将详细的EM知识与标准信号处理方法相结合，可以在不修改天线物理布局的情况下，显着改善系统设计。预期该提议的方法将在当前正在开发的即将出现的5G / 6G和毫米波技术系统中发挥作用，在该系统中，正在将EM和物理层级别的数字信号处理集成在一起。