【摘要】 本文研究了LAS-CDMA系统中所用的扩频码及单小区系统的仿真性能。为了对ITU-VA5径信道做仿真,本文设计了扩频因子为64的LS码,给出了系统在单用户和多用户情况下的误比特率性能。作为对比,本文还给出了在相同条件下,使用Walsh码扩频的CDMA系统的性能仿真。更多还原

【Abstract】 The spread spectrum codes and the simulation performance of single cell LAS-CDMA (Large Area Synchronized Code Division Multiple Access) system are studied. For the sake of the simulation of ITU-VA 5 path channel model, a set of LS codes with the spread factor of 64 is designed. The BER (Bit Error Rate) performance of LAS-CDMA system in the single cell situation and in the multiuser situation is given, and as a comparison, under the same condition, the performance of CDMA system using Walsh codes under the same condition is also given.更多还原