Channel estimation method based on particle filtering

A channel estimation and particle filtering technology, applied in the field of wireless transmission, can solve problems such as not very applicable, and the practical significance of engineering is not very prominent, and achieve the effect of easy implementation, simplified calculation complexity, and stable performance.

Inactive Publication Date: 2006-11-22
SHANGHAI JIAO TONG UNIV +1
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Problems solved by technology

Therefore, the algorithms proposed in the above two articles are not suitable for the actual situation where the channel is unknown, and the practical engineering significance is not very prominent

Method used

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  • Channel estimation method based on particle filtering
  • Channel estimation method based on particle filtering
  • Channel estimation method based on particle filtering

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Embodiment Construction

[0031] Such as figure 1 As shown, the technical solution of the present invention is further described in combination with examples:

[0032] Take a 2-transmit and 2-receive MIMO-OFDM system as an example, the channel bandwidth is 6.4MHz, and the number of subcarriers is 32. The channel is a multipath Rayleigh fading channel, the number of channel multipaths is 2, the time delay is [0ns, 260ns], and the power delay distribution obeys exponential decay. During data transmission, the transmitting antenna inserts a pilot sequence of two consecutive symbols every 6 OFDM symbols, and the pilot sequences on different antennas are orthogonal to each other. Since there is a channel between each transmitting and each receiving antenna, each channel estimation result actually contains the estimation of 4 channels.

[0033] The steps of channel estimation in the present invention are as follows:

[0034] 1. First arrange the block pilots arranged continuously in time on the pilots. This met...

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Abstract

The invention discloses a channel estimation method of corpuscle filtration in the radio transmission domain, which comprises the following steps: estimating least square of channel according to known pilot information; getting initial value which is estimated by the pilot channel; installing particle range and particle amount; giving out initial weight of every particle; using likelihood function to calculate likelihood function value of weight value of every particle according to signal which is received by pick-up antenna; normalizating likelihood function value of every particle; getting normalizated weight value of every particle; using Bayes's theory to get probability distribution function value of current channel value; resampling particle according to judgement condition; transforming current particle to next pilot area; getting channel estimated value of all pilot areas; carrying out interpolation algorism; getting channel estimated value of all transmitted data symbol; finishing channel information estimation. The invention has moderate property and strong anti-noise ability.

Description

Technical field [0001] The invention relates to a channel estimation method for wireless communication, in particular to a channel estimation method based on particle filtering, which is used in the field of wireless transmission technology. Background technique [0002] In wireless communication, the signal in the propagation process is affected by factors such as channel attenuation, multipath delay spread and Doppler frequency spread. In order to better recover the transmitted signal at the receiving end, the method of coherent demodulation is usually used, and the coherent solution Tuning requires channel information, which can be obtained through channel estimation. The performance of the channel estimator directly affects the performance of the system. It is one of the key receiver technologies and plays a vital role in the performance of the broadband mobile communication system. However, because the wireless channel is a time-varying channel in the frequency and time doma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/00H03H15/00H04L25/00H04L25/02H04L27/00
Inventor 梁永明赵晓绚罗汉文张海滨戴文怡佘锋
Owner SHANGHAI JIAO TONG UNIV
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