Channel estimation device and method for OFDM system
一种信道估计、导频信道的技术，应用在通信领域，能够解决不能满足系统性能需求、缺少同步信号等问题，达到提高导频密度、满足系统性能需求、提高精度的效果
Inactive Publication Date: 2013-08-21
TIMI TECH
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Problems solved by technology
[0004] The purpose of the present invention is to solve the problem that the channel estimation based on pilot frequency alone in the prior art cannot meet the performance requirements of the system, and lacks the technology of using synchronization signals for channel estimation to meet the system performance requirements
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[0070] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate 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 only for explaining the present invention and should not be construed as limiting the present invention.
[0071] The present invention mainly lies in that it is applicable to an OFDM system with a synchronization signal and a pilot frequency, and the time domain frame structure of the system signal is as follows: figure 1 As shown, the signal frame 100 includes sync headers 110, 130, 150... and signal bodies 120, 140, 160..., wherein the signal bodies 120, 140, 160... The time / frequency domain multiplexing structure of the pilot and data is as follows figure 2 shown.
[0072] Take the satellite broadcasting system 3000 with a sampling rat...
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The present invention relates to the field of communication technology. A channel estimation device for an Orthogonal Frequency Division Multiplexing (OFDM) system is provided for performing channel estimation on data based on synchronization signal and pilot, which comprises: a synchronization signal based initial channel estimation module for performing initial channel estimation based on a synchronization signal in the data; a pilot channel tracking module for performing pilot channel tracking on the result of the initial channel estimation; a noise reduction module for performing noise reduction on the result of the pilot channel tracking; and an effective sub-carrier extraction module for extracting channel estimation values of effective sub-carriers from the result of the noise reduction. With the channel estimation method and device for OFDM system according to the present invention, the channel estimation is carried out jointly based on the synchronization signal and the pilot, such that the accuracy of channel estimation can be significantly improved and the performance requirements of the system can be satisfied without increasing the density of pilots and thus reducing the amount of system payload. Moreover, the synchronization signal can still be used for its original purpose of carrier and timing synchronization.
Description
technical field [0001] The invention relates to the technical field of communication, in particular to an OFDM-based multi-carrier digital broadcasting system. Background technique [0002] In a broadcast system based on Orthogonal Frequency Division Multiplexing (OFDM), pilots are usually used for channel estimation. The higher the pilot frequency density, the higher the accuracy of channel estimation, and the higher the accuracy of channel estimation, the stronger the ability to resist multipath delay extension. However, the higher the energy occupied by the pilot, the lower the system payload, the lower the system utilization rate, the lower the pilot density, the higher the system payload, the higher the system utilization rate, but the weaker the ability to resist multipath delay extension . In some extreme receiving environments, such as overlapping coverage areas of single frequency networks, channel estimation based on pilots alone cannot meet the performance requi...
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IPC IPC(8): H04L27/26H04J11/00
CPCH04L5/00H04L25/023H04L27/2601
Inventor 葛啟宏王军伟刘斌彬白栋陶涛
Owner TIMI TECH