In conventional 2-D RAKE receiver, channel vector is usually estimated based on LS criterion only using pilot. When the power of the pilot is low or the variation of the channel is fast, the error of the channel estimation becomes large. We propose an improved algorithm in this paper. The steering vector of the desired signal is estimated firstly using subspace decomposition method and a constrained condition is then configured employing this estimated steering vector. Channel vector is estimated based on constrained LS criterion applying traffic signals. The pilot is only used to get the initial value of the estimation. The estimation accuracy of channel vector can progressively increase through iteration. Simulation results demonstrate that the improved algorithm upgrades the estimation accuracy effectively.
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