Channel Parameters Identification Based on IMM Algorithm for Variant Correlation Channel

Abstract EN

In wireless communication systems, correct knowledge of the correlation of a fading channel is essential forchannel estimation.

Both the reliability of the estimated channel impulse response (CIR) and the adjustmentof an adaptive communication system need the accurate correlation information, which is difficult to identifyespecially when changing.

By modeling the fading channel as a hybrid dynamic system, a channel estimationalgorithm based on Interacting Multiple Model (IMM) is presented with the consideration of time-variant channelcorrelation.

Applying the IMM algorithm, the proposed channel estimator can identify the channel correlation.

Withthe accurate information of channel correlation, the proposed algorithm is capable of performing accurate estimationon the fading wireless channel with time-variant or time-invariant correlation.

Our simulations demonstrate that the IMMbased channel estimation algorithm has good performance in estimating CIR as well as in identifying the channelcorrelation.