Time-domain channel synchronous tracker

A channel synchronization and tracker technology, applied in equalizers, shaping networks in transmitters/receivers, baseband system components, etc., can solve problems such as unable to track changing main path signals, and unable to resist multipath effects. Achieve the effect of improving the ability to resist multipath signals

Inactive Publication Date: 2006-10-11
上海奇普科技有限公司
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Problems solved by technology

[0004] When the channel is time-varying, the traditional time-domain adaptive equalizer cannot track the changing main path signal, so it cannot resist the time-varying multipath effect, while the time-domain linear equalizer with a virtual center does not need to track the main path signal fixedly, This makes it possible to combat time-varying multipath effects

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Embodiment Construction

[0041] Take the digital TV terrestrial broadcast transmission system as an application example. The system adopts single-carrier modulation at the transmission end, and the frame structure of the transmission frame is a "preamble + data" structure, where the preamble is the M sequence of "PN255+0", and the mapping method is the diagonal BPSK method, that is, 0 mapping is (4.5, 4.5), and 1 is mapped to (-4.5, -4.5); the data is coded and protected transmission information and system information, the length is 1024 symbols, and the mapping method is 4QAM. In order to combat the harsh channel conditions in the terrestrial broadcast environment, that is, the received signal is the superposition of various reflected waves, and in order to achieve high-quality mobile reception, the system adopts "a time-domain adaptive equalizer with a virtual center" . The channel synchronization tracker of the present invention uses the preamble to do channel estimation, obtains channel informati...

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Abstract

The disclosed time-domain channel synchronous tracker comprises a signal resampling module, a center indicator for equalizer with output signal from last module as its input, a channel correlation estimator with input and output connected to output of resampling module and the analyzer input respectively, a large / small-step synchronous regulation controller, a channel information analyzer, and a signal superimposer to process signals from two controller. This invention improves capacity to anti multi-path signal.

Description

technical field [0001] The invention relates to a time-domain channel tracker, through time-domain estimation and synchronous tracking of the channel, combined with an improved time-domain linear equalization technology, to counteract time-varying multipath effects, belonging to the technical field of synchronous channel estimation and self-adaptive equalization . Background technique [0002] The equalizer is a very important component in the practical application of many different digital information such as voice, data and video communication. Equalizers are used as echo cancellers or compensators for loudspeakers in full-duplex communications, video deghosting in digital television or digital cable transmission, signal conditioners for wireless modems and wireless phones, etc. During signal transmission, the existence of multipath signals in the channel will bring intersymbol interference (ISI), and intersymbol interference is an important cause of errors. In most sing...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03H04L27/01
Inventor 管云峰归琳孙军张文军何大治
Owner 上海奇普科技有限公司
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