Study on HAPS-CDMA sells up-link capacity with different positions and solution

The effects of positions on HAPS-CDMA cells' up-link capacity were analyzed.The simulation results show that the far the cell is from the High Altitude Platform,the more interruption it suffers,so the capacity decreases more.Then a novel user access solution was presented to balance the capacities of different cells,namely the mechanisms of the signals from the users in the cells far from the HAPS which need larger capacity received by both of the terrestrial CDMA base station and the HAPS-CDMA base station.From numerical results it is observed that the algorithms can reduce the impact of the cell position on the capacity,and improve the system performance significantly.