APPARATUS AND METHOD FOR CHANNEL ESTIMATON USING DEDICATED PILOT SIGNAL IN OFDM BASED WIRELESS COMMUNICATION SYSTEMS

摘要

The present invention using the orthogonal transmission beamforming (transmit beamforming) scheme, such as a multi-antenna transmission techniques, frequency division multiplexing (orthogonal frequency division multiplexing: hereinafter OFDM) wireless communication system based on the dedicated pilots (dedicated pilot) signal relates to a method and apparatus using the channel estimation, the receiver is a common pilot (common pilot) stochastic characteristics of the channel (statistical determining the optimal dedicated pilot pattern (pattern) by estimating the stochastic characteristics of the virtual channel (virtual channel) generated by the effect of transmission beamforming techniques using the property) and, from the dedicated pilot signal transmitted from the transmitter to the optimal patterns affine estimates the channel by using the (below AMMSE affine minimum mean square error) of minimum mean square error interpolation technique. The present invention minimizes the error of the channel estimation, the pilot transmission overhead by using the stochastic properties of the virtual channel that is generated by the beam-forming in order to overcome the inefficiencies of conventional channel estimation techniques using a dedicated pilot signal (pilot signaling overhead ), and channel estimation error determined through the analysis of the relationship adaptively optimal only pilot patterns according to the environment and to maximize the transmission rate (throughput) of the system, especially the signal-to-interference plus noise power ratio (signal-to-interference plus noise power ratio;. makes it possible to obtain a large gain from the environment is less inaccurate SINR) becomes lower channel estimation