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A Novel Two-step Channel Prediction Technique for Adaptive Transmission in OFDM/FDD System  

Heo Joo (인하대학교 정보통신대학원)
Chang Kyung-Hi (인하대학교 정보통신대학원)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.8A, 2006 , pp. 745-751 More about this Journal
Abstract
The transmitter requires knowledge of the channel status information in order to adopt the adaptive modulation and coding scheme(AMC) for OFDM system. But in the outdoor environment which the users have high mobility, the channel status information from the users is outdated, so that it induces the degradation of system throughput and packet error rate(PER) performance. To solve this problem, researches about applying channel prediction technique to the AMC scheme have been proceeded. Most channel prediction techniques assume that there is no channel variation in the predefined time duration, e.g., a slot. As a result, those techniques cannot compensate the degradation of PER performance resulting from the rapid variation of channel during the slot duration. This paper introduces a novel channel prediction technique for OFDM/FDD system to support adaptive modulation and coding scheme over rapidly time-varying multipath fading channel. The proposed channel prediction technique considers the time-varying nature of channel during the slot duration. Simulation results show that the AMC scheme of OFDM/FDD system utilizing the proposed channel prediction technique can guarantee the target PER of 1% without any loss of system throughput compared with the case supported by the conventional channel prediction under ITU-R Veh A 30km/h.
Keywords
AMC; Time-Varying Channel; Channel Prediction; OFDM/FDD;
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