In this letter, we propose a new orthogonal coding-based modulation (OCBM) scheme, in which all available transmitting subcarriers and antennas are activated at a time instant to transmit the data constellation symbols, and the indices of the activated subcarriers and antennas are also harnessed to carry information bits. Our OCBM especially addresses a novel scheme in spatial modulation (SM) domain via employing virtual subarray, and improves the spectral efficiency compared with the existing orthogonal frequency division multiplexing (OFDM)-spread spectrum (SS), index modulation (IM)-OFDM-SS and IM-OFDM based SM (the number of transmit antennas is more than 2). In addition, our investigated detection scheme of the OCBM reduces the complexity of the receiver design by using the unique behavior of the orthogonal code, especially for the detection of the transmitted antenna index bits. Our simulated experiments have been carried out to test the performance of the proposed scheme, and demonstrate the benefits of our suggested approach.

中文翻译：

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基于正交编码的调制

在这封信中，我们提出了一种新的基于正交编码的调制（OCBM）方案，其中所有可用的发射副载波和天线都在一个时刻被激活以发射数据星座符号，并且被激活的副载波和天线的索引也是用于携带信息位。我们的OCBM通过使用虚拟子阵列特别解决了空间调制（SM）域的新方案，与现有的正交频分复用（OFDM）-扩频（SS），索引调制（IM）-OFDM-相比，提高了频谱效率。基于 SS 和 IM-OFDM 的 SM（发射天线数大于 2）。此外，我们研究的 OCBM 检测方案通过使用正交码的独特行为降低了接收机设计的复杂性，特别是用于检测发射天线索引位。我们已经进行了模拟实验以测试所提出方案的性能，并证明了我们所建议方法的好处。