Multi-user Detection using a Combination of Linear Sequence Estimation and Successive Interference Cancellation

We propose a Multi-user Detection (MUD) receiver that combines Linear Sequence Estimation (LSE) and Successive Interference Cancellation (SIC). It is based on the symbol-response model commonly employed in the context of Joint Detectors (JD). It mitigates Inter Symbol Interference (ISI) by LSE and Multiple Access Interference (MAI) via SIC. We provide numerical results that compare its performance to JD and RAKE receivers in frequency-selective fading channels. It exhibits better performance and lower complexity than existing RAKE based SIC receivers, especially in channels with large delay spreads and a large number of non-zero taps. It has a substantially lower complexity as compared to JD receivers with comparable performance under many channel conditions of interest. Key applications include burst mode WCDMA systems such as the 3GPP TDD system.