A spectrally encapsulated (SE) orthogonal frequency‐division multiplexing (OFDM) precoding scheme for wireless short packet transmission, which can suppress the out‐of‐band emission (OoBE) while maintaining the advantage of the cyclic prefix (CP)‐OFDM, is proposed. The SE‐OFDM symbol consists of a prefix, an inverse fast Fourier transform (IFFT) symbol, and a suffix generated by the head, center, and tail matrices, respectively. The prefix and suffix play the roles of a guard interval and suppress the OoBE, and the IFFT symbol has the same size as the discrete Fourier transform symbol in the CP‐OFDM symbol and serves as an information field. Specifically, as the center matrix generating the IFFT symbol is orthogonal, data and pilot symbols can be allocated to any subcarrier without distinction. Even if the proposed precoder is required to generate OFDM symbols with spectral efficiency in the transmitter, a corresponding decoder is not required in the receiver. The proposed scheme is compared with CP‐OFDM in terms of spectrum, OoBE, and bit‐error rate.

中文翻译：

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基于正交化的短数据包传输OFDM系统的频谱封装

一种用于无线短数据包传输的频谱封装（SE）正交频分复用（OFDM）预编码方案，可以在保持循环前缀（CP）-OFDM优势的同时抑制带外发射（OoBE）。建议。SE-OFDM符号由一个前缀，一个快速傅里叶逆变换（IFFT）符号和一个分别由头，中和尾矩阵生成的后缀组成。前缀和后缀起保护间隔的作用并抑制OoBE，并且IFFT符号的大小与CP-OFDM符号中的离散傅立叶变换符号相同，并且用作信息字段。具体地，由于生成IFFT符号的中心矩阵是正交的，因此可以将数据和导频符号无区别地分配给任何子载波。即使要求所提出的预编码器在发射机中产生具有频谱效率的OFDM符号，在接收机中也不需要相应的解码器。在频谱，OoBE和误码率方面，将所提方案与CP-OFDM进行了比较。