Partial symmetric extension discrete Fourier transform-based channel estimation method

Abstract

The invention discloses a partial symmetric extension discrete Fourier transform-based channel estimation method, which comprises the following steps of: performing primary least square (LS) channel estimation on a frequency domain received signal on a preamble sub-carrier to obtain a primary LS channel parameter estimate; performing partial symmetric extension on the primary LS channel parameterestimate; performing inverse discrete Fourier transform (IDFT) of a corresponding point number on the LS channel parameter estimate subjected to the partial symmetric extension to obtain an intra-transform domain equivalent channel parameter estimate; performing filtering processing on the intra-transform domain equivalent channel parameter estimate to obtain a more accurate channel parameter estimate; performing discrete Fourier transform (DFT) on the filtered intra-transform domain equivalent channel parameter estimate to obtain a frequency domain channel estimate of a partial symmetric extension sequence; performing inverse extension on the frequency domain channel estimate of the partial symmetric extension sequence to obtain a channel estimate at the preamble sub-carrier; and performing row interpolation on the channel estimate at the preamble sub-carrier to obtain the frequency domain channel estimates at all sub-carriers.

Description

technical field [0001] The present invention relates to an Orthogonal Frequency Division Multiplexing (OFDM) broadband mobile communication system using a pilot, in particular to a wireless signal processing method for a wireless communication receiving end. Background technique [0002] OFDM technology has been adopted as a key link technology by various wireless transmission standards because of its high transmission bandwidth, high transmission efficiency and effective resistance to multipath fading. In the Long Term Evolution) standard, the OFDM technology is also adopted as a downlink transmission scheme. Coherent reception in OFDM systems requires accurate channel information. The method of obtaining the channel response on the pilot subcarrier by inserting the known pilot on the fixed subcarrier of the OFDM symbol, and obtaining the channel response on the non-pilot subcarrier by subsequent interpolation is called pilot-assisted channel Estimation method. In actual...

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Problems solved by technology

[0003] Technical problem: The present invention proposes a channel estimation method based on partially symmetric extended discrete Fourier transform, which solves the problem of edge subcarrier performance degradation caused by virtual carriers in traditional DFT channel estimation methods in OFDM broadband mobile communication systems using pilots question

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