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Terrestrial broadcasting channel estimating method for digital television and device thereof

A digital TV terrestrial and broadcast channel technology, applied in the field of digital information transmission, can solve the problems that the iterative method is complicated and difficult to implement, and the process of searching for the maximum path is not suitable for real-time processing, etc.

Inactive Publication Date: 2010-12-15
BEIHANG UNIV
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Problems solved by technology

It can be seen that although the first method is simple, it is an approximate process that artificially introduces errors; the second method uses iterative processing to reduce the impact of the non-ideal correlation of the PN sequence to a certain extent, but the iterative method is complex It is not easy to implement, especially the process of searching for the maximum path is not suitable for real-time processing

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  • Terrestrial broadcasting channel estimating method for digital television and device thereof
  • Terrestrial broadcasting channel estimating method for digital television and device thereof
  • Terrestrial broadcasting channel estimating method for digital television and device thereof

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Embodiment Construction

[0058] As mentioned above, for broadband wireless broadcasting in terrestrial wireless channels, if the receiving end does not compensate for the ISI (Inter-Symbol Interference) caused by the multipath channel, it will cause serious decoding errors; To estimate and then compensate the frequency selective fading caused by multipath, digital TV terrestrial broadcasting periodically inserts the frame header PN sequence as a known training sequence in its frame structure definition; therefore, for the reception of digital TV terrestrial broadcasting , an applicable channel multipath fading compensation scheme can be divided into two steps: channel estimation based on the PN sequence of each signal frame header and subsequent equalization. For channel estimation, the channel can be approximately considered to remain unchanged during the duration of the frame header, so that the time-domain impulse response of the channel at each frame header time can be obtained based on the frame h...

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Abstract

The invention relates to a method for estimating channel of digital TV terrestrial broadcasting and a device thereof, which pertains to the technical filed of digital information transmission and is applicable to national standard digital TV terrestrial broadcasting (GB 20600-2006) systems, digital communication systems, telemetry and telecontrol systems and other relevant systems and technical fields. Under the frame head modes of PN420 and PN945 of digital TV terrestrial broadcasting, the multipath channel impulse response which falls into the prefix length range of the frame head PN sequence can be estimated by the following processing of sampling sequence of symbol rate after synchronization: (a) synchronization and pre-processing; (b) cyclic correlation; (c) channel impulse molding. The method and the device of the invention utilize diversity gain brought by the PN sequence correlation, have good anti-noise performance, can effectively reduce interference resulting from non-idealautocorrelation of the PN sequence , accurately and fast estimate the multipath channel impulse response which falls into the prefix length range of the frame head PN sequence and have the advantagesof high estimation accuracy, small calculation amount and low implementation complexity compared with other methods.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and is applicable to digital TV terrestrial broadcasting (GB 20600-2006) systems, digital communication systems, telemetry and remote control systems and other related systems and technical fields, and specifically relates to a digital TV terrestrial broadcasting (GB20600-2006) Channel estimation technology for PN420 and PN945 frame header mode. Background technique [0002] Digital TV broadcasting signals are propagated in terrestrial multipath channels. Due to the reflection of objects in the surrounding environment, the signal received by the receiving end is the superposition of multiple transmitted signals with different propagation delays and channel fading, that is, delay extension, especially for broadband For digital TV terrestrial broadcasting, delay extension will cause serious inter-symbol interference (ISI), which will cause serious receiving and decoding err...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04N7/24
Inventor 张晓林王哲张展张超
Owner BEIHANG UNIV
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