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2016•Unpublished venueRequires access

Proposal of a new OFDM scheme for a doubling of spectral efficiency

Misaki Hirabayashi, Kazutaka Yamai, Takenao Yokomori, Tomotaka Kimura, Masahiro Muraguchi

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Abstract

A new OFDM scheme for a doubling of spectral efficiency is proposed. It consists of two independent OFDM signals that are squeezed into the same frequency band. One of the OFDM sub-carriers are inserted into frequency gaps of the other OFDM sub-carriers. It is impossible to separate two OFDM signals in the baseband region because there is no orthogonality between sub-carriers of two OFDM signals. So, a key is in signal separation process in the receiver. Our proposal is to use frequency difference between two OFDM signals in the IF-band region. A perfect separation becomes accomplished under limited conditions for cutoff frequency of transmit filters in the transmitter. The potential of our proposal is demonstrated and the remaining problem is also discussed.

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What this paper is about

A new OFDM scheme for a doubling of spectral efficiency is proposed. It consists of two independent OFDM signals that are squeezed into the same frequency band. One of the OFDM sub-carriers are inserted into frequency gaps of the other OFDM sub-carriers. It is impossible to separate two OFDM signals in the baseband region because there is no orthogonality between sub-carriers of two OFDM signals. So, a key is in signal separation process in the receiver. Our proposal is to use frequency difference between two OFDM signals in the IF-band region. A perfect separation becomes accomplished under limited conditions for cutoff frequency of transmit filters in the transmitter. The potential of our proposal is demonstrated and the remaining problem is also discussed.

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Available abstract

A new OFDM scheme for a doubling of spectral efficiency is proposed. It consists of two independent OFDM signals that are squeezed into the same frequency band. One of the OFDM sub-carriers are inserted into frequency gaps of the other OFDM sub-carriers. It is impossible to separate two OFDM signals in the baseband region because there is no orthogonality between sub-carriers of two OFDM signals. So, a key is in signal separation process in the receiver. Our proposal is to use frequency difference between two OFDM signals in the IF-band region. A perfect separation becomes accomplished under limited conditions for cutoff frequency of transmit filters in the transmitter. The potential of our proposal is demonstrated and the remaining problem is also discussed.

Key concepts: Orthogonal frequency-division multiplexing, Baseband, Transmitter, Orthogonality, Electronic engineering, Computer science, Spectral efficiency, SIGNAL (programming language)

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