Least Squares Channel Estimation for Analog Network Coding Over Frequency Selective Fading Channels

Two-way relay networks can have their throughputs improved by adopting physical-layer network coding. To work properly, these systems need to know the channel impulse responses involved. Most previous works on channel estimation for physical-layer network coding systems consider flat fading or frequency-selective fading together with orthogonal frequency division multiplexing modulation. However, for single carrier systems under frequency-selective channels these estimators can not be applied directly. Therefore, a least squares channel estimator for these scenarios is proposed here. Simulations are performed to evaluate the performance of this channel estimator and the results show the effectiveness of the proposed technique.