Abstract: An orthogonal reverse link (RL) method is studied based on the current CDMA2000 channel structure. The effect on RL system capacity is analyzed by use of rise-over-thermal (ROT) criterion. The numerical calculations and dynamic system level simulations show that the system capacity, comparing with non-orthogonal RL, is enlarged significantly by reduction of the intra-cell interference for orthogonal RL. On the other hand, the gain is limited by the orthogonal code resources in the system.

Key words: code division multiple access, reverse link orthogonality, orthogonal factor