A novel channel estimator for a superposition-based cooperative system
Yu Gong, Zhiguo Ding, Tharmalingam Ratnarajah, Colin F. N. Cowan · 2006
This paper investigates channel estimation and equaliza-tion for the relay node of a cooperative diversity system based on superposition modulation. Exploring the superpo-sition structure of the transmission data, we propose a novel channel estimator for the relay node. Without any pilot se-quence, the proposed estimator can converge to the ideal case as if the transmission data is known to the receiver. We also re-derive the soft-input-soft-output MMSE equalizer to match the superimposed data structure of the cooperative scheme. Finally computer simulation results are given to ver-ify the proposed algorithm. 1.