Data-guiding channel estimation method for OFDM systems, and implementation device thereof

A technology of channel estimation and position estimation, applied in the field of digital information transmission, can solve the problem of training information occupying system spectrum resources, etc., achieve the effects of improving spectrum utilization, simplifying implementation, and improving system mobility performance

Active Publication Date: 2009-11-25
TSINGHUA UNIV
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Problems solved by technology

Training information occupies precious system spectrum resources, so how to reduce training information and improve syst

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  • Data-guiding channel estimation method for OFDM systems, and implementation device thereof
  • Data-guiding channel estimation method for OFDM systems, and implementation device thereof
  • Data-guiding channel estimation method for OFDM systems, and implementation device thereof

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Embodiment Construction

[0044] In order to make the purpose, content, and advantages of the present invention clearer, the following further describes the embodiments of the present invention in detail with reference to the accompanying drawings.

[0045] As described in the background art, the OFDM system includes a variety of OFDM block modulation techniques, guard interval filling techniques, training information carrying techniques, and symbol modulation techniques.

[0046] Refer to figure 1 , Represents one of the embodiments, a schematic diagram of the frame structure of a TDS-OFDM system. The frequency domain symbol to be transmitted in the i-th frame is X i (k), any symbol modulation technique can be selected. The frequency domain symbols to be transmitted form a frequency domain data block of length M {X i (k)) i＝0 M-1 , Does not include pilots and virtual sub-carriers. Frequency domain data block {X i (k)) i＝0 M-1 After inverse discrete Fourier transform, the time domain data block {x i [n]...

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Abstract

The invention provides a data-guiding channel estimation method for OFDM systems, and an implementation device thereof, which belong to the technical field of digital information transmission. The method demodulates and recovers frequency-domain data symbols at the receiving end of an OFDM system and performs channel estimation. The method comprises the steps of utilizing a frame structure to obtain initial channel estimation result, building a time-domain signal frame and the cyclic convolution of channel impulse response, demodulating frequency-domain data symbols of a current frame, and performing data-guiding channel estimation and post processing. The device comprises an initial channel estimation module, a channel estimation gating module, a cyclic convolution building block, a frequency-domain data block demodulation module, a data-guiding channel estimation module, a channel estimation post-processing module and a control module. The method and the device use hidden informationcarried by frequency-domain data sent by the OFDM system in symbol modulation, as well as initial channel estimation provided by training information, completes receiving the channel estimation of all signal frames, and can reduce complexity, improve precision and increase the utilization ratio of frequency spectrum, mobile performance and other effects.

Description

Technical field [0001] The invention belongs to the technical field of digital information transmission, and particularly relates to a data-guided channel estimation method and an implementation device for an OFDM block transmission technology system in a wireless communication system. The OFDM block transmission technology includes a variety of OFDM block modulation technologies, guard interval filling technology, training information carrying technology and symbol modulation technology. Background technique [0002] Broadband wireless transmission must face ISI (Inter Symbol Interference) or frequency selective fading introduced by multipath effects. OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology can reliably achieve high-rate transmission in frequency selective fading channels, and has been widely used in wireless LANs, fixed wireless access, digital audio and video broadcasting, etc. Communication system. OFDM technolo...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 彭克武杨昉潘长勇杨知行宋健
Owner TSINGHUA UNIV
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