On Interference in Uplink SDMA SC-FDE system

In this paper, the issue of channel estimation with multiple In-Cell co-channel Users (ICUs) in the presence of Out of Cell Interferers (OCIs) is addressed. A Single Carrier Frequency Domain Equalization (SC-FDE), uplink Space Division Multiple Access (SDMA) system with Iterative Block Decision Feedback Equalization (IBDFE), based on the soft decisions is considered. To overcome the intra-cell interference, it is shown that if orthogonality between users during their training phase is assured, then good performance is achievable compared to non-orthogonal training. Moreover, we have shown that the way to multiplex the training either in time or frequency, does not affect the performance in time-variant channels as long as the orthogonality is maintained. It is also shown that Intercell interference could be mitigated with a combination of in-cell orthogonal pilots, spatial diversity and iterative receiver processing. Performance improvement by an IBDFE based on the soft decisions is a...

• Type: Conference
• Year: 2007
• Where: CNSR
• Authors: Fayyaz Siddiqui, Florence Danilo-Lemoine, David D. Falconer
• Keywords: CNSR 2007, Frequency Domain Equalization, Soft Decisions, Space Division Multiple Access