Cellular CDMA with downlink single-channel interference-mitigating - Detection: A semi-analytic capacity evaluation

The paper focuses on (low complexity) adaptive Mininium Mean-Square Error (MMSE) single-channel detection in the mobile User Terminal (UT) of a Code-Division Multiple Access (CDMA) cellular network. With respect to the conventional (single-channel) correlation receiver (CR), such detector leads to a significant improvement in the delivered Quality of Service (QoS), through joint interference mitigation and channel equalization. As is peculiar of CDMA, this QoS improvement can be turned into a capacity increase in terms of accommodated users/cell. In this contribution, we compute network. capacity and Bit-Error Rate (BER) performance both for the CR and for the MMSE detector on the Gaussian as well as on the time-varying mullipath channel, with perfect and imperfect downlink power control. It turns out that the MMSE detector leads to a non-negligible downlink capacity, enhancement with respect to the CR, and is also less sensitive than CR to power-control imperfections