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Time-varying channel evaluation and equalizing method and system for TDS-OFDM receiver

A time-varying channel and equalization method technology, applied in the field of digital information transmission, can solve problems such as performance loss, ignoring channel changes, and affecting receiver performance

Inactive Publication Date: 2005-05-18
TSINGHUA UNIV
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Problems solved by technology

[0024] However, the above method ignores the change of the channel within one OFDM block, and is a simple and practical method when the channel changes slowly
However, in the mobile receiving environment, simply assuming that the channel is constant within an OFDM block, it is inevitable that the channel cannot be accurately estimated, resulting in performance loss. When the mobile speed of the receiver is high, the channel is within an OFDM block. can not be ignored, otherwise it will seriously affect the performance of the receiver

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Embodiment Construction

[0087] Terrestrial wireless TV broadcasting is a time-varying frequency-selective fading channel in a mobile receiving environment. The time-varying channel estimation and equalization method proposed in the present invention assumes that the channel changes linearly in an OFDM block, which is a common problem in general mobile receiving. Can closely match the real channel variation. But because the present invention considers the change of the channel in one OFDM block, it cannot be realized by simple division when performing equalization. On the TDS-OFDM system framework, the present invention breaks through the original assumption that the channel in an OFDM block is constant, assumes that the channel changes linearly in an OFDM block, and proposes a time-varying channel estimation and Equalization method and its system, that is, an OFDM intra-block linear interpolation channel estimation method based on PN code time-domain correlation method and a simplified equalization m...

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Abstract

This invention relates to TDS-OFDM receiver time-varying channel estimation and the balance method and system which assumes the channel varies in linearity in an OFDM block. Firstly a channel response estimation at the PN of each OFDM block is got by PN code time domain then to carry out linear interpolating in the OFDM block to get the entire channel response estimation. This invention puts forward a simplified balance method for complementing the balance matrix with ICI to carry out spreading of finite item power series, which greatly increases the receiving performance of TDS-OFDM receivers under time-varying channel and is better than the scheme of assuming the channel unchanged in an OFDM block.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and in particular relates to a time-varying channel estimation and equalization method and system of a Time Domain Synchronous OFDM (TDS-OFDM) digital television receiver. Background technique [0002] Various multipath and fading phenomena exist in the transmission channel of terrestrial wireless TV broadcasting (mainly VHF and UHF frequency bands), which cause static / dynamic multipath interference, and it is a time-varying frequency selective fading channel. In a mobile receiving environment, Doppler frequency shift will occur. If a single-frequency signal is sent, the received signal will be a band-limited signal centered on the transmitted frequency and with the maximum Doppler shift as the bandwidth. The power spectrum of the received signal is generally Jake’s model, which can be expressed as : [0003] [0004] In the above formula, w d = 2πT s f d . where...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 杨知行符剑潘长勇王军杨林
Owner TSINGHUA UNIV
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