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Spectrally Efficient Orthogonal Frequency Division Multiplexing with Cyclic Prefix and Postfix, and Pilots
Spectrally Efficient Orthogonal Frequency Division Multiplexing with Cyclic Prefix and Postfix, and Pilots
- Source :
- ICTC
- Publication Year :
- 2018
- Publisher :
- IEEE, 2018.
-
Abstract
- In this paper, we propose a precoding scheme for 6th generation (6G) mobile communications, which can enhance the spectrum efficiency by overcoming the shortcoming of OFDM of power flowing out to adjacent channels and estimate the channel state with pilots. The proposed scheme is the first trial to have spectral efficiency by having orthogonality between subcarriers in the in-band as well as out-of-band (OOB) spectral efficiency. The precoding is realized with a matrix that consists of a cyclic prefix matrix, a central matrix, and a cyclic postfix matrix. The cyclic prefix and postfix matrices, and the central matrix play roles to provide the packet with the guard interval and to carry an information-bearing signal, respectively. The fade in and fade out properties of cyclic prefix and postfix can confine the spectrum of OFDM signals and prohibit the power leakage to adjacent channels. A good autocorrelation characteristic of the precoding scheme can guarantee the frequency offset estimation with high quality. Since the columns of the central matrix in the time domain are orthogonal to each other, the pilot symbols can be inserted in the same manner as in the conventional OFDM scheme.We will show that the proposed precoding scheme is useful in terms of out-of-band power leakage blocking, autocorrelation, and BER performance compared with OFDM.
- Subjects :
- Computer science
Orthogonal frequency-division multiplexing
020206 networking & telecommunications
02 engineering and technology
Spectral efficiency
Precoding
Cyclic prefix
Frequency domain
Guard interval
Computer Science::Networking and Internet Architecture
0202 electrical engineering, electronic engineering, information engineering
Frequency offset
Algorithm
Computer Science::Information Theory
Communication channel
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- 2018 International Conference on Information and Communication Technology Convergence (ICTC)
- Accession number :
- edsair.doi...........f0a32e1a5e825efc2d663a9cc34251ee
- Full Text :
- https://doi.org/10.1109/ictc.2018.8539538