A channel hopping technique II: simulation result

For pt.I see ibid., p.229-33. In mobile systems, the frequency selective fading channel impairs CDMA signals by the MAI (multi access interference) resulting from non-zero cross-correlations among the relative delayed signals. This interference increases with the number of the active channels, i.e. the number of codes, and limits the capacity strongly. To address this problem, the channel hopping technique was developed; it can transmit more information bits for a given number of the codes. Alternatively, for a given value of throughput, the proposed technique can reduce effectively the number of codes and, therefore, increase capacity by reducing the MAI. The predicted advantage is verified by simulation based on the platform of a modified TDD-WCDMA standard. The results confirm the theoretical result in terms of a better BER performance.