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Information channel estimation method of data subcarrier

A data subcarrier and channel estimation technology, applied in the field of channel estimation, can solve the problem of channel estimation performance being affected by noise, and achieve the effect of reducing the impact

Inactive Publication Date: 2013-06-05
ZTE CORP
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Problems solved by technology

[0013] The purpose of the present invention is to provide a channel estimation method on the data subcarrier, which is used to adaptively track the change of the maximum multipath time delay of the channel, so as to solve the channel condition in which the maximum multipath time delay exists in the prior art. The problem that the lower channel estimation performance is greatly affected by noise

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  • Information channel estimation method of data subcarrier
  • Information channel estimation method of data subcarrier
  • Information channel estimation method of data subcarrier

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Embodiment Construction

[0028] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0029] The channel estimation interpolation filter coefficient selection method of the present invention includes: a synchronization symbol extraction module for extracting 2048-point time domain synchronization signals; an FFT module for obtaining frequency domain synchronization symbols and obtaining channel response waveforms on synchronization symbols The frequency spectrum of the synchronization symbol; the channel estimation module of the synchronization symbol is used to solve the channel response value of each subcarrier on the synchronization symbol; the energy statistics module is used to calculate the energy sum of the different segments of the channel response waveform spectrum; the filter coefficient selection module, according to each sub-carrier The energy of the segment sets the threshold to select different interpolation filter coeffici...

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Abstract

A channel estimation method and system on the data subcarriers are provided. The channel estimation method includes: adopting the FIR low pass interpolation filters; including more than one FIR low pass interpolation filters with different bandwidths; making statistics of different segments' energy distribution of a channel response waveform spectrum firstly, and then selecting a FIR low pass interpolation filter with corresponding bandwidth according to the energy distribution. The different filter coefficients are selected based on the energy distribution of the synchronization symbol channel response spectrum, the algorithm is easy to be realized, and the interpolation filters with different bandwidths may be chosen self-adaptively according to the situation of channel maximum multipath delay, without searching the channel maximum multipath delay. Compared with the common used linear interpolation algorithms in the existing systems, the larger multipath delay channels may be overcome, and meanwhile the impact of noise on channel estimation results can also be reduced greatly for the smaller multipath delay channels.

Description

Technical field [0001] The present invention relates to a channel estimation method of an orthogonal frequency division multiplexing communication system, in particular to a channel estimation method on data subcarriers. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplex, Orthogonal Frequency Division Multiplex) is a high-speed transmission technology in a wireless environment. It transmits data in parallel through a set of orthogonal subcarriers, making it sensitive to the frequency selectivity of multipath fading channels. The degree is greatly reduced. In order to further overcome the impact of inter-symbol interference (ISI) caused by multipath delay, a certain length of cyclic prefix (CP) is usually added before the OFDM symbol in the time domain. CMMB (China Mobile Multimedia Broadcasting, China Mobile Multimedia Broadcasting) system The schematic diagram of the OFDM symbol can be found in figure 1 . [0003] In the OFDM communication system, a ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L27/26
CPCH04L25/0202H04L25/0224
Inventor 张涛李强邱宁曹南山游月意陈力
Owner ZTE CORP