Channel estimation method and device

Abstract

The invention relates to a channel estimation method and device which are used to perform channel estimation according to the received frame signal, wherein the frame signal consists of known sequence and data sequence. The method of the invention comprises the following steps: predicting the channel estimation predicted value of the i-th frame according to the channel estimated values of frames before the i-th frame, then obtaining the estimation predicted values of the i-th frame and the (i-1)th frame according to the channel estimation predicted value of the i-th frame; obtaining the smearof the known sequence of the i-th frame in the data sequence of the i-th frame according to the estimation predicted value of the i-th frame and the channel estimation predicted value of the i-th frame; obtaining the smear of the data sequence of the (i-1)th frame in the known sequence of the i-th frame according to the estimation predicted value of the (i-1)th frame and the channel estimation predicted value of the i-th frame, and reconstructing the known sequence of the i-th frame in time domain to obtain the frequency-domain channel estimated value and time domain channel estimated value of the i-th frame. The channel estimation method and device of the invention simplify the complexity of channel estimation and can be used to track the rapidly changing dynamic channel.

Description

technical field [0001] The present invention relates to wireless communication technology, in particular to a channel estimation method applicable to a single carrier system and a channel estimation device applied to a receiver. Background technique [0002] Common broadband wireless communication systems are based on single-carrier or multi-carrier transmission. For single-carrier transmission systems, there are quadrature amplitude modulation (QAM: Quadrature Amplitude Modulation), vestigial sideband amplitude modulation (AM-VSB: Amplitude Modulation Vestigial Side -Band), etc., and the most common one for the multi-carrier transmission system is Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing). Both single-carrier and multi-carrier systems have their own advantages and disadvantages. The multi-carrier system is more flexible and easy to integrate with multiple-input multiple-output technology (MIMO: Multiple-Input Multiple-Out-...

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Problems solved by technology

However, for more general cases, the PN sequence may not be a complete m sequence, or there is no cyclic prefix structure, so the time domain cyclic correlation method cannot be used

[0009] The article "iterative Padding Subtraction of the PN Sequence for the TDS-OFDMover Broadcast Channels" (Consumer Electronics, IEEE Transactions on, IssueDate: Nov.2005, Volume: 51 Issue: 4, page(s): 1148-1152), proposed A method of channel estimation and equalization, suitable for multi-carrier systems, but this method uses two-step prediction and iterative method for channel estimation and equalization, but the prediction error caused by two-step prediction is difficult to eliminate by iterative method

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