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Channel estimation method and device for crossing frequency division multiplexing system

An orthogonal frequency division and channel estimation technology, applied in the direction of multi-frequency code system, baseband system components, etc., can solve the problems of increased interpolation error and decreased estimation performance, so as to improve performance, achieve moderate complexity, and improve The effect of accuracy

Inactive Publication Date: 2007-02-07
UTSTARCOM TELECOM CO LTD
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Problems solved by technology

However, if this type of method is directly applied to the WiMAX system, due to the channel frequency selectivity of the channel in the multipath environment, the interpolation error will increase, resulting in a decrease in estimation performance

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  • Channel estimation method and device for crossing frequency division multiplexing system
  • Channel estimation method and device for crossing frequency division multiplexing system
  • Channel estimation method and device for crossing frequency division multiplexing system

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Embodiment Construction

[0040] In the following description, the WiMAX system based on the IEEE802.16 standard is used as an example to describe the embodiment of the present invention, but this does not mean that the present invention is limited to the application on this kind of communication system, on the contrary, the present invention can also It can be extended to other OFDM systems including preamble symbols and pilots.

[0041]In the present invention, the preamble symbol refers to various characteristic symbols used to identify the frame set at a specific position (such as the frame head and the frame tail) of an OFDM frame, and the data symbol refers to the intra-frame Various other symbols used to transmit data. The data symbols include two types of subcarriers, one of which carries pilots for channel estimation, hereinafter referred to as pilot subcarriers or pilot points, and the other type carries data, which is referred to as data subcarriers carrier. It is worth noting that the arr...

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Abstract

The invention relates to a signal channel estimate method used in orthogonal frequency division multiplexing system, a relative device, and an orthogonal frequency division multiplexing system using said device, wherein said signal channel estimate method comprises: fixing the signal channel frequency response of sub carrier wave of at least one forward mark and the signal channel frequency response of several pilots of one data mark in one orthogonal frequency division multiplexing frame; based on said the nearby pilot of data mark, estimating the signal channel frequency response of data sub carrier wave; using said signal frequency response to correct the signal channel frequency response of said data sub carrier wave; compared with present technique, the invention can avoid noise effect and high interpolation error, to improve the system property, with low complexity.

Description

technical field [0001] The present invention relates to wireless communication technology, in particular to a channel estimation method and device for an orthogonal frequency division multiplexing system, and an orthogonal frequency division multiplexing system using the channel estimation device. Background technique [0002] WiMAX is a standards-based technology that can replace existing cable and DSL connections to provide last-mile wireless broadband access. Currently relevant standards include 802.16d-2004 (fixed broadband wireless access standard) and 802.16e-2005 (mobile-enabled broadband wireless access standard), which are incorporated herein by reference. [0003] Orthogonal frequency division multiplexing / orthogonal frequency division multiplexing multiple access (OFDM / OFDMA) is the technical basis for WiMAX system to realize high-speed and high-quality data transmission, and in order to ensure the accuracy of subsequent demodulation, the OFDM channel must be Acc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 何婷玉朱近康邱玲
Owner UTSTARCOM TELECOM CO LTD
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