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Energy Efficient Precoding C-RAN Downlink with Compression at Fronthaul | | Kien-Giang Nguyen
; Quang-Doanh Vu
; Markku Juntti
; Le-Nam Tran
; | | Date: |
17 Mar 2017 | | Abstract: | This paper considers a downlink transmission of cloud radio access network
(C-RAN) in which precoded baseband signals at a common baseband unit are
compressed before being forwarded to radio units (RUs) through limited
fronthaul capacity links. We investigate the joint design of precoding,
multivariate compression and RU-user selection which maximizes the energy
efficiency of downlink C-RAN networks. The considered problem is inherently a
rank-constrained mixed Boolean nonconvex program for which a globally optimal
solution is difficult and computationally expensive to find. In order to derive
practically appealing solutions, we invoke some useful relaxation and
transformation techniques to arrive at a more tractable (but still nonconvex)
continuous program. To solve the relaxation problem, we propose an iterative
procedure based on DC algorithms which is provably convergent. Numerical
results demonstrate the superior of the proposed solution in terms of
achievable energy efficiency compared to existing schemes. | | Source: | arXiv, 1703.5996 | | Services: | Forum | Review | PDF | Favorites | |
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