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Technical Program

Paper Detail

Paper IDD7-S3-T1.3
Paper Title Distributed DNN based Processing for Uplink Could-RAN
Authors Chao Zhang, Aymen Askri, Ghaya Rekaya-Ben Othman, Télécom Paris, France
Session D7-S3-T1: Topics in Multiple Access II
Chaired Session: Tuesday, 20 July, 22:40 - 23:00
Engagement Session: Tuesday, 20 July, 23:00 - 23:20
Abstract This paper investigates the uplink reception in the cloud radio access network (C-RAN) with finite-capacity fronthaul links. The latter is an emerging network that transfers the computing load from the radio heads (RHs) to the central processor (CP) unit. Due to the prohibitive complexity of computations, most efficient uplink C-RAN schemes are challenging to be implemented in practical systems. Using deep neural networks (DNNs), we propose a new and low complex distributed processing for uplink C-RAN subject to some quantification rules. The objective of our architecture, called TDNet, is to optimize the processing jointly at the RHs and the CP side. Our goal is not to solve the signal detection in multi-antenna systems. Instead, our work aims to find a useful transformation scheme at the RH side before quantization as long as a correspondent decoding scheme at the CP side considers the quantization scheme. Inspired by the projected gradient descent algorithm, TDNet is designed as a distributed DNN with sparse connections. Numerical results are provided and show that our scheme outperforms linear receivers such as the zero-forcing (ZF). It also achieves near-optimal performance compared to the sphere decoder (SD) algorithm, especially for a low-to-moderate number of quantization bits.