A PAR-DQ random access preamble detection algorithm in LTE-satellite communication system

The present random access (RA) scheme in terrestrial LTE (T-LTE) cannot be applied in LTE-satellite system, for the remarkable miss detection probability caused by large difference of propagation delay in satellite communication system. In this paper, a Peak to Average Ratio after Deleting Quasi-users (PAR-DQ) detection algorithm is proposed. The algorithm can deal with the large difference of propagation delay in satellite system. Quasi users are selected based on constraint coefficients which are defined according to difference of propagation delay first. And then, the average of correlation values is calculated after deleting quasi users. Finally, the peak to average ratio is chosen as decision variable in this algorithm. The threshold setting scheme is also presented which can be adjusted according to the required false alarm rate in multi-user scenario. Simulation results manifest that the proposed algorithm can achieve excellent performance in satellite environment.