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Channel estimation method for TDS-OFDM system

A channel estimation and channel estimation technology, which is applied in the field of channel estimation of TDS-OFDM system, can solve problems such as complex calculations, achieve accurate channel estimation results, reduce complexity, and reduce the length of calculations

Inactive Publication Date: 2008-03-05
TSINGHUA UNIV
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Problems solved by technology

However, when using this method for channel estimation, the channel estimation of the previous two consecutive OFDM symbols needs to be known, and multiple iterations are required for each OFDM symbol to obtain a more accurate channel estimation, and the calculation is complicated.

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  • Channel estimation method for TDS-OFDM system
  • Channel estimation method for TDS-OFDM system
  • Channel estimation method for TDS-OFDM system

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Embodiment Construction

[0057] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0058] When channel estimation is performed in the embodiment of the present invention, circular convolution is constructed, and partial judgment is performed on data blocks of TDS-OFDM frames to assist channel estimation, thereby improving convergence speed of iterations and reducing computational complexity.

[0059] In the embodiment of the present invention, the TDS-OFDM frame generally refers to the TDS-OFDM received signal frame, and the pseudo-random sequence filled in each transmitted signal frame in the TDS-OFDM signal is the same. Referring to Figure 2, it is a baseband model diagram of a TDS-OFDM system, in which S / P and P / S represent serial / parallel conversion and parallel / serial conversion respectively, and AWGN (Additive W...

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Abstract

The method includes steps: using channel estimation (CE) result obtained from iteration at last time of previous frame or iteration at previous time of current frame as initial channel impulse response (CIR) for iteration at this time of current frame; based on CIR to remove interference on data block from pseudo random sequence (PRS), and carrying out circulating reconstruction for data block; equalizing the circulating reconstructed result, and carrying out partial judgment for equalized result; based on result of partial judgment and initial CIR to remove interference on PRS from data block, and carrying out circulating reconstruction for PRS; based on the circulating reconstructed result to re-estimate CIR, and considering the CIR as CE of iteration at this time of current frame. Carrying out partial judgment on data block of TDS-OFDM system to assist CE, the invention raises precision of CE, and reduces complexity of calculation.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to a channel estimation method for a TDS-OFDM system. Background technique [0002] The main problem that wireless communication technology solves at present is how to increase the transmission rate reliably within the limited bandwidth. OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) can reliably achieve high-speed transmission in frequency-selective fading channels, and has been widely used in wireless communications such as wireless local area networks, fixed wireless access, digital audio and video broadcasting system. There are currently two OFDM systems, one is based on CP (Cyclic Prefix, cyclic prefix) CP-OFDM system, which uses CP to fill the guard interval, and the guard interval is located between two OFDM symbols to resist the delay spread in the channel . During the transmission process of the CP-b...

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Application Information

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IPC IPC(8): H04L25/03H04L27/01H04L27/26
Inventor 彭克武唐世刚杨知行潘长勇宋健
Owner TSINGHUA UNIV