Optimal Fronthaul Quantization for Cloud Radio Positioning
Abstract: Wireless positioning systems that are implemented by means of a cloud radio access network (C-RAN) may provide cost-effective solutions, particularly for indoor localization. In a C-RAN, baseband processing, including localization, is carried out at a centralized control unit (CU) based on quantized baseband signals received from the radio units (RUs) over ďŹ nite-capacity fronthaul links. In this paper, the problem of maximizing the localiza(on accuracy over fronthaul quan(za(on/compression is formulated by adop(ng the CramĂŠr-Rao bound (CRB) on the localization accuracy as the performance metric of interest and information-theoretic bounds on the compression rate. The analysis explicitly accounts for the uncertainty of parameters at the CU via a robust, or worst-case, optimization formulation. The proposed algorithm leverages the Charnes-Cooper transformation and difference-of-convex (DC) programming and is validated via numerical results.