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Spectrally Encapsulated Orthogonal Frequency Division Multiplexing for Short Packet Transmission
- Citation Author(s):
- Submitted by:
- myungsup kim
- Last updated:
- Tue, 03/05/2019 - 20:56
- DOI:
- 10.21227/dzmd-nb35
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Abstract
A spectrally encapsulated orthogonal frequency division multiplexing (SE-OFDM) precoding scheme for short packet transmission that is able to suppress the out-of-band emission (OoBE) while maintaining the advantage of thecyclic prefix (CP)-OFDM is proposed. The SE-OFDM symbol consists of a prefix, an information (I)-symboland a suffix that are generated by head, center and tail matrices, respectively. The prefix and suffix play the roles of guard interval (GI) and suppress the OoBE, and the I-symbol has the same size as the DFT symbolin the CP-OFDM symbol and serves as an information field. Specifically, since the center matrix generating theI-symbol is orthogonal, data and pilot symbols can be allocated to any subcarriers without distinction. Even if the proposed precoder is required to generate OFDM symbols with spectral efficiency in the transmitter, any decoder corresponding to that is not required in the receiver. The precoder, which is in matrix form, is created through six processes: inverse discrete Fourier transform (IDFT), permutation, weighting, filtering, orthogonalizing, and approximating. Through the orthogonalizing process, the center matrix of the precoder matrix becomes orthogonal, and the head and tail matrices retain the ability to block the OoBE to adjacent channels. The proposed scheme is compared with CP-OFDM in terms of the OoBE, autocorrelation, and bit error rate (BER).
IEEE Trans. VT
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Myungsup Kim
Korea Advanced Institute of Science and Technology
291Daehak-ro, Yusung-gu,
Deajeon 34141, Republic of Korea
+82-42-350-2720
myungsup@kaist.ac.kr
Editor-in-Chief
IEEE Transactions on Vehicular Technology
March 6, 2019
Dear Editor
I am pleased to submit an original research article entitled “Spectrally Encapsulated Orthogonal Frequency Division Multiplexing for Short Packet Transmission” by Myungsup Kim, Do Young Kwak, Ki-Man Kim, and Wan-Jin Kim for consideration for publication in IEEE Transactions on Vehicular Technology.
In this manuscript, we offer the following contributions and novelties:
A new precoding scheme with a parallel processing structure is proposed to reduce the out-of-band emission (OoBE) of orthogonal frequency division multiplexing (OFDM) systems.
The initial matrix is processed in six steps to generate a precoder.Each step is modeled using matrices for simple and clear analysis.
The OoBE is controlled through windowing and filtering functions in the time domain.
The packet with an extremely short cyclic prefix, such as 8 or 16 in length, can be precoded without increasing their length. The scheme can be applied to the existing IEEE 802.11a standard as well as the newly emerging IEEE 802.11ax standard.
The proposed scheme is an optimal precoding scheme because the performance over the three types of channels matches that of OFDM.
Since the proposed scheme has low implementation complexity, it can be applied to both downlink and uplink transmission.
We believe that this manuscript is appropriate for publication in IEEE Transactions on Vehicular Technology because the journal publishes high-quality papers reporting theoretical and experimental advances in the general area of communications. Our manuscript provides a paradigm for future research on essential OoBE suppression in OFDM systems.
This manuscript has not been published and is not under consideration for publication elsewhere. We have no conflicts of interest to disclose.
Thank you for your consideration!
Sincerely,
Myungsup Kim, PhD
Project Manager, Future Communications Research Laboratory,
Korea Advanced Institute of Science and Technology.