A channel estimator and method based on feedback reconstruction
A channel estimator and channel estimation technology, applied in the field of signal compensation, can solve the problems of error diffusion, poor estimation performance, and inability to achieve estimation performance, etc.
Inactive Publication Date: 2011-11-30
VIMICRO CORP
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Since the forward estimation method cannot make timely adjustments to the estimator according to channel changes, it cannot provide good estimation performance in channels with strong channel time-varying characteristics and large interference signals.
However, most of the existing feedback estimation methods are carried out in the time domain or time direction. These methods either have poor estimation performance or high implementation complexity, so they are not suitable for the actual digital TV receiving system.
For the existing channel estimation algorithm implemented in the frequency domain using the feedback link, since the channel estimation is performed directly using the decoded information, there is no interference cancellation mechanism, and error diffusion is prone to occur when the interference signal is strong, so it cannot achieve satisfactory The estimated performance of
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[0045] The channel estimator and method based on feedback reconstruction provided by the present invention encode and modulate the decoded previous symbol data signal through the encoding / modulation feedback module to form a reconstructed signal and feed back to the interference cancellation module; interference cancellation The module constructs an interference signal based on the reconstructed signal and the original channel response of the previous symbol read from the memory module and the original data signal of the current symbol, and then eliminates the interference signal from the original data signal of the current symbol to form interference The elimination signal is output to the multi-level channel estimation module; the multi-level channel estimation module performs original channel estimation to the pilot signal in the received symbol, and stores the obtained original channel response in the memory module, after receiving the interference elimination signal, perfo...
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A channel estimator based on feedback reconstruction, wherein: the encoding / modulation feedback module encodes and modulates the decoded data signal of the previous symbol to form a reconstructed signal and feed it back to the interference cancellation module; the interference cancellation module according to The reconstructed signal, the stored original channel response of the previous symbol and the original data signal of the current symbol construct an interference signal, and eliminate the interference signal from the original data signal of the current symbol to form an interference cancellation signal output to the multi-stage Channel estimation module; the multi-level channel estimation module performs original channel estimation to the pilot signal in the receiving symbol, obtains the original channel response, after receiving the interference cancellation signal, according to the original data signal and the original channel response of the current symbol stored The secondary channel estimation is performed to obtain the secondary channel response. The invention can still robustly compensate the original data signal under the condition of strong interference and fast time-varying channel.
Description
technical field [0001] The invention relates to a signal compensation technology of a digital communication system and a receiving device of a digital multimedia broadcasting system, in particular to a channel estimator and method based on feedback reconstruction for channel equalization. Background technique [0002] In communication systems and digital multimedia broadcasting systems, in order to ensure the accurate transmission of information, it is generally necessary to perform channel equalization on the received signal, and channel estimation is usually required before channel equalization, that is, to estimate the distortion of the channel to the transmitted signal as much as possible or distortion effects. As a signal processing method, channel estimation can usually be performed in the time domain or in the frequency domain. Since most digital television broadcasting systems use Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multip...
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IPC IPC(8): H04L1/00H04B7/26
Inventor 黄晓
Owner VIMICRO CORP