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The impact of imperfect channel estimation on the forward-link performance in CDMA distributed antenna systems in multi-path fading environment is investigated. A detailed analytical model based on a hybrid signal combining method is presented and exact outage probability expression is derived. The investigation shows that the effect of imperfect channel estimates varies with system load. Furthermore, if simulcasting is employed, macro-diversity can decrease the sensitivity of forward-link to channel estimation errors and increase the forward-link outage performance, which is contrary to the conclusion drawn based on the ideal channel estimation assumption.
The impact of imperfect channel estimation on the forward-link performance in CDMA distributed antenna systems in multi-path fading environment is investigated. A detailed analytical model based on a hybrid signal combining method is presented and exact outage probability expression is derived. that the effect of imperfect channel estimates varies with system load. Furthermore, if simulcasting is employed, macro-diversity can decrease the sensitivity of forward-link to channel estimation errors and increase the forward-link outage performance, which is contrary to the tether based on the ideal channel estimation assumption.