Sequential Closed-Form Semiblind Receiver for Space-Time Coded Multihop Relaying Systems
Walter C. Freitas, Gérard Favier, André L. F. de Almeida · IEEE Signal Processing Letters · 2017
In this letter, we present a sequential closed-form semiblind receiver for a one-way multihop amplify-and-forward relaying system. Assuming Khatri-Rao space-time coding at each relay, it is shown that the system with K relays can be modeled by means of a generalized nested PARAFAC model. Decomposing this model into K + 1 third-order PARAFAC models, we develop a closed-form semiblind receiver for jointly estimating the information symbols and the individual channels, at the destination node. Each step consists of a Khatri-Rao factorization. Parameter identifiability conditions are given, and simulation results are provided to illustrate the effectiveness of the proposed semiblind receiver.