Joint precoding and fronthaul optimization for C-RANs in ergodic fading channels

Document Type

Conference Proceeding

Publication Date

9-8-2015

Abstract

This work investigates the joint design of fronthaul compression and precoding for the downlink of Cloud Radio Access Networks (C-RANs). The main goal is that of bringing insight into an aspect of the optimal functional split between Radio Units (RUs) and Central Unit (CU), namely: where should precoding be performed? Unlike previous works, we tackle this issue for a practical scenario with block-ergodic channels and either instantaneous or stochastic Channel State Information (CSI) at the CU. Optimization algorithms over fronthaul compression and precoding are proposed that are based on a stochastic successive upper-bound minimization approach. Via numerical results, the relative merits of two strategies, in which precoding is carried out at the CU or at the RUs, are evaluated as a function of system parameters such as fronthaul capacity and channel coherence time under either instantaneous or stochastic CSI at the CU.

Identifier

84947731021 (Scopus)

ISBN

[9781467363051]

Publication Title

2015 IEEE International Conference on Communication Workshop Iccw 2015

External Full Text Location

https://doi.org/10.1109/ICCW.2015.7247584

First Page

2683

Last Page

2688

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