Abstract:

Based on multi-path fading environment, the impact of simulcasting and signal combining methods on the forward link performance in direct spreading code division multiplex access（DSCDMA）distributed antenna systems with imperfect channel estimation was analyzed. A detailed multi-path multi-access model for distributed antenna systems was proposed and exact outage probability expression was derived. The study shows that the impact of channel estimation errors varies with system load. Furthermore, forward link simulcasting can decrease both the impact of channel estimation errors and the outage probability.

Key words: distributed antenna systems, simulcasting, macrodiversity, imperfect channel estimation