Efficient joint channel equalization and tracking for V2X communications using SC-FDE schemes

• Main Author: Pedrosa, Pedro
• Publication Date: 2020
• Other Authors: Castanheira, Daniel, Silva, Adão, Dinis, Rui, Gameiro, Atílio
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: http://hdl.handle.net/10773/28753
• topic: Adaptive equalizers; Channel estimation; Digital communication; Kalman filters; Signal processing; Signal processing algorithms; Vehicular and wireless technologies

Our aim with this paper is to present a solution suitable for vehicle-to-everything (V2X) communications, particularly, when employing single-carrier modulations combined with frequency-domain equalization (SC-FDE). In fact, we consider the V2X channel to be doubly-selective, where the variation of the channel in time is due to the presence of a Doppler term. Accordingly, the equalization procedure is dealt by a low-complexity iterative frequency-domain equalizer based on the iterative block decisionfeedback equalization (IB-DFE) while the tracking procedure is conducted employing an extended Kalman filter (EKF). The proposed system is very efficient since it allows a very low density of training symbols, even for fast-varying channels. Furthermore only two training symbols are required to initialize the tracking procedure. Thus, ensuring low latency together with reduced channel estimation overheads.