Simulation Performance of MMSE-BLE-SD Detector in the Downlink of TD-SCDMA System

Time division - synchronization code division multiple access (TD-SCDMA) is one of the international protocols for the 3rd generation mobile communication systems. One of its key features is the so-called joint detection (JD), which is adopted to combat the serious multiple access interference (MAI) and inter- symbol interference (ISI) caused by multipath propagation in the case of a short spreading factor (SF). The normally used JD algorithm in TD-SCDMA receiver is zero-forcing block linear equalizer (ZF-BLE), which is a little complex to implement. In this paper, a new candidate algorithm, i.e. MMSE-BLE-SD (minimum mean squared error block linear equalizer for single user detection), which could be implemented with Fast Fourier Transform (FFT), is considered and performance analyzed in the TD- SCDMA linklevel simulation platform. The results show that this less complex detector could provide improved performance than the current used ZF-BLE in the case of 12.2k bit/s voice traffic.