SCIENCE CHINA Information Sciences, Volume 64 , Issue 10 : 200303(2021) https://doi.org/10.1007/s11432-020-3253-7

Optical true time delay pool-based beamforming and limited feedback for reconfigurable intelligent surface-empowered cloud radio access networks

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  • ReceivedNov 30, 2020
  • AcceptedApr 25, 2021
  • PublishedSep 7, 2021



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  • Figure 1

    (Color online) Structure of the proposed OTTDP-based HBF and limited feedback for RIS empowered mmWave C-RANs, where (a) physical implementation of the OTTDP and (b) schematic diagram of interconnection matrix ${{\boldsymbol~M}}_{\rm{IC}}$ are illustrated.

  • Table 1  

    Table 1The complexity and overheads of the proposed NI-LF precoding and AO algorithms

    The AO algorithm The proposed NI-LF precoding algorithm
    Number of multiplications $\mathcal{O}~(\kappa~(3M_{\rm{R}}^2+5M_{\rm{R}}M_{\rm{A}}+2M_{\rm{A}}~)~)$ $\mathcal{O}~(N_t^{\rm{RF}}~(K+M_{\rm{A}}~(2K+(N_t^{\rm{RF}})^2+3N_t^{\rm{RF}}+2~)~)~)$
    Number of divisions $\mathcal{O}~(N_t^{\rm{RF}}~(N_t^{\rm{RF}}+1~)~(2N_t^{\rm{RF}}+1~)/6~)$
    Training overhead $\left(M_{\rm{U}}\times~M_{\rm{R}}+M_{\rm{R}}\times~M_{\rm{A}}+M_{\rm{U}}\times~M_{\rm{A}}\right)\times~B$ $\left(M_{\rm{U}}\times~M_{\rm{A}}\right)\times~B$
    Feedback overhead $M_{\rm{R}}\times~B$ $N_s\times~N_t^{\rm{RF}}\times~B+N_t^{\rm{RF}}\times~B_{\lambda}$

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