Orthogonal frequency division multiplexing (OFDM) channel estimation method based on filter bank

A channel estimation and filter bank technology, applied in baseband system components, shaping network in transmitter/receiver, multi-frequency code system, etc., can solve problems such as difficult to meet the actual use requirements, unable to obtain channel statistical characteristics, etc. , to achieve the effect of low bit error floor and low computational complexity

Inactive Publication Date: 2011-03-30
石强
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Problems solved by technology

However, to use effective coherent demodulation technology to obtain higher SNR gain, it is necessary to estimate and track channel parameters at the receiving end, especially to achieve high-precision channel parameters under time-varying and low SNR conditions. Estimation, low signal-to-noise ratio conditions determine

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  • Orthogonal frequency division multiplexing (OFDM) channel estimation method based on filter bank
  • Orthogonal frequency division multiplexing (OFDM) channel estimation method based on filter bank
  • Orthogonal frequency division multiplexing (OFDM) channel estimation method based on filter bank

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and preferred embodiments. The concrete realization steps of the inventive method are as follows:

[0019] (1) Perform channel coding, modulation, and serial-to-parallel conversion on the source data to become effective data D to be transmitted in a subcarrier format, where B is the frequency domain subcarrier sampling interval of OFDM, and the value of B is four times the maximum extension value of the delay, Indicates that the result after N is divided by B is rounded down;

[0020] (2) produce subcarrier pilot data P=exp(j2πkBn / N) corresponding to channel frequency domain sampling position, The length of the pilot data is equal to a quarter of the frame length of the OFDM transmission system, and the pilot data and the data structure to be transmitted are multiplexed according to the comb pilot format to form the OFDM transmission data frame X;

[0021] (3) Perfo...

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Abstract

The invention discloses an orthogonal frequency division multiplexing (OFDM) channel estimation method based on a filter bank, which comprises the following steps: generating the complex exponential pilot data having the same center frequency with the OFDM sampling sub-carrier, multiplexing with the information source data, filtering the pilot data corresponding to the pilot on the receiving terminal by a multiphase filter bank which is realized by the N point FFT, then performing the least squares estimation to the output data of each corresponding channel to obtain the initial channel frequency domain estimation data, and obtaining the initial channel frequency domain data of all the sub-carriers through the processing of linear interpolation, then performing the IFFT process, performing the zero fill and the FFT process to the L point major tap coefficients in the time domain, and finally obtaining the channel parameters corresponding to all the positions of the sub-carriers through the interpolation in the frequency domain. The method of the invention solves the defects of poor channel estimation under the condition of low signal to noise ratio in the existing schemes, and have the advantages of stable performance, low cost, low error code floor and the like.

Description

technical field [0001] The present invention relates to a communication signal processing method in wireless communication, and in particular provides a filter bank-based OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) channel estimation method. Background technique [0002] Today, the third generation of digital mobile communications (3G, The 3rd Generation) is developing rapidly. TD-SCDMA proposed by China is also one of the global 3G standards. 3G mobile terminals will be widely used soon, and the business service market of 3G mobile terminals will also flourish. With the continuous evolution of the third generation, the next three generations and future mobile communication systems, wireless communication systems will provide higher and higher data rates and more reliable communication quality assurance. At the same time, the environment where the user terminal is located will become more and more complex with the advancement...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/03
Inventor 石强
Owner 石强
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