Feedback Bit Allocation Optimization for Cooperative Massive MIMO Networks with Ray-Based Channel Environment 


Vol. 46,  No. 3, pp. 440-449, Mar.  2021
10.7840/kics.2021.46.3.440


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  Abstract

Ray-based channel model is widely considered as a statistical channel model by reflecting the physical characteristics of Massive MIMO systems and millimeter wave band. In this paper, we propose a feedback bit allocation optimization scheme for angle-of-departure(AoD)-adaptive subspace codebook, in order to reduce feedback overhead for channel state information(CSI) acquisition and backhaul overhead for CSI sharing in cooperative Massive MIMO networks in a Ray-based channel. Analyzing the rate loss when the AoD-adaptive subspace codebook is utilized, we reveal that the impact of the quantization error on achievable rate depends on the number of multipaths of the intra-cell user channel and other-cell interfering channels. By deriving the optimal feedback bit allocation to the intra-cell user channel and other-cell interfering channels in a closed-form, we devise an adaptive feedback scheme according to the number of multipaths for the Ray-based channel. It is shown that the proposed scheme significantly increases the average sum rate compared to the existing schemes.

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  Cite this article

[IEEE Style]

J. Kang and W. Choi, "Feedback Bit Allocation Optimization for Cooperative Massive MIMO Networks with Ray-Based Channel Environment," The Journal of Korean Institute of Communications and Information Sciences, vol. 46, no. 3, pp. 440-449, 2021. DOI: 10.7840/kics.2021.46.3.440.

[ACM Style]

Jinho Kang and Wan Choi. 2021. Feedback Bit Allocation Optimization for Cooperative Massive MIMO Networks with Ray-Based Channel Environment. The Journal of Korean Institute of Communications and Information Sciences, 46, 3, (2021), 440-449. DOI: 10.7840/kics.2021.46.3.440.

[KICS Style]

Jinho Kang and Wan Choi, "Feedback Bit Allocation Optimization for Cooperative Massive MIMO Networks with Ray-Based Channel Environment," The Journal of Korean Institute of Communications and Information Sciences, vol. 46, no. 3, pp. 440-449, 3. 2021. (https://doi.org/10.7840/kics.2021.46.3.440)

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pISSN : 1226 - 4717
eISSN : 2287 - 3880