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Channel estimation method and device

A channel estimation and channel technology, which is applied in channel estimation, digital transmission system, baseband system components, etc. It can solve problems such as complex iterative algorithm, inability to resist strong multipath, long delay, bad channel, etc.

Active Publication Date: 2018-10-02
TSINGHUA UNIV
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Problems solved by technology

The iterative algorithm of channel estimation in the traditional TDS-OFDM system is very complicated due to the limitation of the frame structure, and the channel estimation is only performed through the time-domain training sequence, so there are certain technical difficulties, such as the high complexity of the iterative algorithm, and the traditional TDS -OFDM system cannot resist bad channels with strong multipath and long delay

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Embodiment Construction

[0030] Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, and are intended to explain the present application, and should not be construed as limiting the present application.

[0031] Firstly, analyze the TDS-OFDM block transmission technology. Such as figure 1 As shown, in the TDS-OFDM signal frame, there are two parts of interference that need to be eliminated: the interference of the PN sequence to the OFDM data block due to the influence of multipath, and the interference of the OFDM data block to the PN sequence due to the influence of multipath interference. The interference of the PN sequence to the OFDM data block due to the influence of multipath can be accurately calculated and eliminat...

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Abstract

The invention discloses a channel estimation method and device. The channel estimation method comprises the steps that all sub-carriers in a frequency domain of an OFDM data block are divided into different frequency domain physical-layer sub-channels; coarse estimation is conducted on the frequency domain physical-layer sub-channels through a time domain training sequence with interference to obtain coarse estimation values of the frequency domain physical-layer sub-channels; cyclical reconstruction and frequency domain balance are conducted on the OFDM data block according to the coarse estimation values of the frequency domain physical-layer sub-channels and then demodulation is conducted on the data of the bottommost-layer frequency domain physical-layer sub-channels to obtain data demodulation values of the bottommost-layer frequency domain physical-layer sub-channels; accurate estimation is conducted on the frequency domain physical-layer sub-channels according to the data demodulation values of the bottommost-layer frequency domain physical-layer sub-channels to obtain accurate estimation values of the frequency domain physical-layer sub-channels; cyclical reconstruction and frequency domain balance are conducted on the OFDM data block again according to the accurate estimation values of the frequency domain physical-layer sub-channels. By the adoption of the channel estimation method, strong multi-path long-time-delay severe channels can be resisted on the premise that an OFDM system has higher spectral efficiency.

Description

technical field [0001] The present application relates to the technical field of digital communication, and in particular to a channel estimation method and device. Background technique [0002] In digital communication block transmission technology, it is very necessary to use equalization to eliminate or suppress Inter Symbol Interference (ISI). Among them, Orthogonal Frequency Division Multiplexing (OFDM), as a block transmission method, can well improve the communication system's resistance to frequency selective channels through frequency domain equalization. In related technologies, there are three very representative OFDM block transmission technologies: OFDM with cyclic prefix (Cyclic Prefix OFDM, CP-OFDM), zero padding OFDM (Zero PaddingOFDM, ZP-OFDM), and time domain synchronization Orthogonal Frequency Division Multiplexing (Time-Domain Synchronous OFDM, TDS-OFDM). [0003] CP-OFDM, the cyclic prefix (CP) in CP-OFDM is a replication of the last part of the OFDM ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
CPCH04L25/024H04L27/2649
Inventor 张超刘菁菁李智潘长勇
Owner TSINGHUA UNIV