Macrodiversity in DS/CDMA Asynchronous Systems with Decorrelating Detectors

This paper analyzes the application of macrodiversity in Code DivisionMultiple Access (CDMA) asynchronous systems with decorrelatingdetection in the reverse link. It is shown that decorrelatingdetectors allow predetection combining and, utilizing this property,several combining strategies are studied. We obtain the set ofcombining factors which minimize the bit error probability, andbased on these results, we propose the Simplified Minimum ErrorCriterion (SMEC), which has little impact on the overallcomplexity of the system and outperforms theMaximal Signal to Interference plus Noise Ratio Combiner(MSINRC). Using this technique, it is possible to perform a distributeddetection in the area influenced by the mobile, allowing thecoexistence of heterogeneous cells and the effective useof microcells.