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Interpolating method for an OFDM system and channel estimation method and apparatus

A technology of channel estimation and interpolation method, applied in the field of communication, which can solve the problems of increased hardware design cost, complex control logic, high power consumption, etc.

Active Publication Date: 2009-12-23
北京特艺企业管理有限公司
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  • Application Information

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Problems solved by technology

However, this special handling leads to higher hardware design costs because more memory resources are required to store these coefficients that are only used once in many cycles
In addition, the content of the register cache filter needs to be updated frequently, which will lead to complex control logic and higher power consumption

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  • Interpolating method for an OFDM system and channel estimation method and apparatus
  • Interpolating method for an OFDM system and channel estimation method and apparatus
  • Interpolating method for an OFDM system and channel estimation method and apparatus

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[0022] The technical features of the present invention will be described in detail below in conjunction with the embodiments. The described embodiments are only preferred examples and do not limit the scope of the present invention. The present invention will be easier to understand by describing in detail the embodiments of the present invention in conjunction with the accompanying drawings.

[0023] In a pilot-aided OFDM system, the channel estimation process is usually performed through the scattered pilot information contained in the OFDM signal. In each OFDM symbol, scattered pilots provide a reference signal with known amplitude and phase every n OFDM subcarriers. Channel estimates can be obtained by interpolation in the time and frequency domains. Filtering is often used as a frequency domain interpolation method.

[0024] Frequency-domain interpolation and 12-tap Wiener filters in DVB-T systems can be taken as examples. Scattered pilots in DVB-T system are shown in...

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Abstract

The present invention provides an interpolating method for an OFDM system, a channel estimation method and apparatus, in which each OFDM symbol has scattered pilots inserted, and the interpolating method comprising: the step (S602) of inserting at least one copy of the first scattered pilot in each OFDM symbol before the first scattered pilot as virtual pilots, and inserting at least one copy of the last scattered pilot in each OFDM symbol behind the last scattered pilot as virtual pilots, after obtaining the channel state information on the sub channels which propagate the scattered pilots in the OFDM symbols by linear filtering; and the step (S604) of performing interpolation by a FIR filter with the channel state information.

Description

technical field [0001] The present invention generally relates to communication technology, and more specifically, relates to an interpolation method and a channel estimation method and device for OFDM systems. Background technique [0002] OFDM technology is one of the main solutions for multi-path channel conditions in wireless broadband communication. In many pilot-aided OFDM-based systems, channel estimation utilizes frequency-domain filtering techniques (e.g., Wiener filters) to beat multipath channel conditions (“channel aided by two-dimensional pilot signals via Wiener filtering estimate"). In order to accurately calculate channel coefficients, FIR filters are generally used to implement channel estimation means. The frequency domain interpolator usually divides the OFDM symbol into three parts for processing: the beginning part, the body part and the end part. The interpolation methods applied to these parts are different. However, this special handling leads to ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04L25/02
CPCH04L5/0007H04L5/006H04L25/0232H04L25/0226H04L5/0048H04L27/2601H04J11/00
Inventor 吴毅凌邹黎刘鹏
Owner 北京特艺企业管理有限公司