Sum-Rate Maximization of Interference-Free OFDM for K-User Interference Channels with Blind Transmitters 


Vol. 45,  No. 10, pp. 1681-1684, Oct.  2020
10.7840/kics.2020.45.10.1681


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  Abstract

This paper considers the K-user single-input single-output interference channels with inter-symbol interference. To manage inter-user and inter-symbol interference without CSIT (Channel state information at transmitter), we exploit interference-free OFDM (IF-OFDM). IF-OFDM focuses on maximizing DoF (Degrees-of-freedom). However, since the DoF maximization does not always guarantee the sum-rate maximization over entire SNR regimes, we optimize the combining matrix of IF-OFDM in order to maximize the sum-rate. The objective function is transformed into a form of the generalized Rayleigh quotient. We derive the upper-bound of the sum-rate by using properties of matrix determinant. Finally, we find the optimal combining matrix in an analytical form by showing that the upper bound can be achieved by the combining matrix. Numerical results demonstrate that the proposed IF-OFDM significantly outperforms the conventional IF-OFDM as well as interference avoidance approach (e.g., TDMA) in terms of sum-rate, especially in entire SNR regimes.

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  Cite this article

[IEEE Style]

N. Ha and W. Shin, "Sum-Rate Maximization of Interference-Free OFDM for K-User Interference Channels with Blind Transmitters," The Journal of Korean Institute of Communications and Information Sciences, vol. 45, no. 10, pp. 1681-1684, 2020. DOI: 10.7840/kics.2020.45.10.1681.

[ACM Style]

Nohgyeom Ha and Wonjea Shin. 2020. Sum-Rate Maximization of Interference-Free OFDM for K-User Interference Channels with Blind Transmitters. The Journal of Korean Institute of Communications and Information Sciences, 45, 10, (2020), 1681-1684. DOI: 10.7840/kics.2020.45.10.1681.

[KICS Style]

Nohgyeom Ha and Wonjea Shin, "Sum-Rate Maximization of Interference-Free OFDM for K-User Interference Channels with Blind Transmitters," The Journal of Korean Institute of Communications and Information Sciences, vol. 45, no. 10, pp. 1681-1684, 10. 2020. (https://doi.org/10.7840/kics.2020.45.10.1681)

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pISSN : 1226 - 4717
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