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Channel estimation method and device based on sparse discrete pilot frequency in OFDM system

A channel estimation and scattered pilot technology, applied in the field of communication, can solve problems such as no solution

Active Publication Date: 2020-12-29
BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If you want to make such a system work in mobile and time-varying wireless channel scenarios, there is currently no relevant solution

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  • Channel estimation method and device based on sparse discrete pilot frequency in OFDM system
  • Channel estimation method and device based on sparse discrete pilot frequency in OFDM system
  • Channel estimation method and device based on sparse discrete pilot frequency in OFDM system

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Embodiment Construction

[0035] The specific implementation manners of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the embodiments of the present invention, and are not intended to limit the embodiments of the present invention.

[0036] The OFDM system of the present invention is aimed at the burst OFDM system, firstly explain the relevant characteristics of the sparse scattered pilots of the burst OFDM system:

[0037] Burst OFDM systems such as 802.11a and IEEE802.15.4g have short + long training sequences in the front of the burst frame to complete synchronization acquisition, initial frequency offset estimation and channel estimation, and the rear of the burst frame is the SIG / PHR domain Indicates the encoding and modulation information of the physical layer and the PHYPayload physical layer payload fi...

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Abstract

The embodiment of the invention provides a channel estimation method and device based on sparse discrete pilot frequency in an OFDM system, and belongs to the technical field of communication. The method comprises the following steps: obtaining least square channel estimation values on M OFDM symbols after an initial OFDM symbol l0; obtaining channel estimation values on P*M discrete pilots on a target OFDM symbol lobj; obtaining quasi-least square channel estimation values on a plurality of different subcarriers on the target OFDM symbol lobj; and carrying out filtering and noise reduction processing to obtain channel estimation values on all effective subcarriers on the target OFDM symbol lobj. According to the invention, a burst OFDM system can be applied to mobile and time-varying channel scenes, and the application range of the burst OFDM system is expanded.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a channel estimation method and device based on sparse scattered pilots in an OFDM system. Background technique [0002] For burst OFDM systems with sparse scattered pilots, sparse scattered pilots are usually designed for phase tracking caused by residual frequency offsets, and the working scenarios of such systems are usually assumed to be quasi-static. If it is desired to make such a system work in mobile and time-varying wireless channel scenarios, there is currently no relevant solution. Contents of the invention [0003] The purpose of the embodiment of the present invention is to provide a channel estimation method and device based on sparse scattered pilots in an OFDM system, and the channel estimation method and device based on sparse scattered pilots in the OFDM system can make the burst OFDM system applied to Mobile and time-varying channel scenarios ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02
CPCH04L25/0212H04L25/0224
Inventor 王于波唐晓柯赵亚红赵旭胡毅李德建
Owner BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY