A Radio Channel Estimation Scheme Using the CQI Feedback Information in High Speed Downlink Packet Access

In HSDPA, mobile terminals measure their own radio channel status and report the quality to base station using a channel quality indicator (CQI). The main purpose of the CQI feedback is to utilize this information for scheduling and adaptive modulation and coding (AMC) in a base station. However, since CQI is another version of signal-to-interference and noise ratio (SINR), we can extract more information about radio channel states of mobile terminals. In this paper, we propose an effective two-dimensional radio channel estimation scheme from the current and past CQI information for each mobile terminal. We show the effectiveness of the proposed scheme by evaluating the performance through mathematical analysis and simulations.