Joint Channel and Symbol Estimation for Communication Systems with Movable Antennas

Josué Vasconcelos de Araújo, Jose Carlos Filho, Gilderlan Tavares de Araújo, Paulo Gomes, André L. F. de Almeida

DOI: 10.14209/sbrt.2025.1571156592

Evento: XLIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT2025)

Keywords: Movable antennas Multiuser systems Tensor decomposition Semi-blind estimation

Abstract

Communication systems aided by movable antennas have been the subject of recent research due to their potentially increased spatial degrees of freedom offered by optimizing the antenna positioning at the transmitter and/or receiver. In this context, a topic that deserves attention is channel estimation. Conventional methods reported recently rely on pilot-assisted strategies to estimate the channel coefficients. In this work, we address the joint channel and symbol estimation problem for an uplink MU communication system, where the BS is equipped with a movable antenna array. A semi-blind receiver based on the PARAFAC2 model is formulated to exploit the tensor decomposition structure for the received signals, from which channel and symbol estimates can be jointly obtained via an alternating estimation algorithm. Compared with reference schemes, our preliminary numerical simulations yield remarkable results for the proposed method.

Download