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Method and apparatus for channel estimation

a channel estimation and channel estimation technology, applied in the field of multicarrier communication systems, can solve the problems of sharp decline in the performance of dvb-t receivers designed for fixed receiving as the speed of the receivers rises, and the difficulty of making dvb-t/h receivers work well in high-speed environments

Active Publication Date: 2014-11-04
INTERDIGITAL MADISON PATENT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the performance of DVB-T receivers designed for fixed receiving degrades sharply as the speed of the receivers ascending.
So it is a challenging problem to make the DVB-T / H receivers work well in high speed environments.

Method used

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Embodiment Construction

[0013]A description will now be given with reference to the attached figures to illustrate many advantages / features of the present invention, according to an illustrative embodiment.

[0014]In a mobile receiving system, the channel is time-variant, which is the main difference with a fixed receiving system. Conventional channel estimation modules designed for DVB-T can work well in time-invariant channels, but they can't track time-variant channels, which is a main reason that the fixed DVB-T receivers can't work well in mobile environments. In a DVB-T / H OFDM system, the channel estimation assumes that the channel is time-invariant, so it can't track the time direction variation. Therefore, when moving speed of the mobile receiving system is high, the performance of channel estimation will degrade severely. So an effective method of channel estimation is very important for mobile DVB-T / H receivers.

[0015]Referring to FIG. 1, which is a block diagram of an example of an OFDM signal rece...

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Abstract

The present invention provides a method for channel estimation used in a receiver of a multi-carrier communication system, including: receiving a multi-carrier symbols from a transmitter of the multi-carrier communication system; and obtaining channel information of sub-carriers carrying data of the multi-carrier symbols, using selectively time direction interpolation and frequency direction interpolation for channel information of a plurality of scatter pilots of the multi-carrier symbols.

Description

[0001]This application claims the benefit, under 35 U.S.C. §365 of International Application PCT / CN2009 / 001574, filed Dec. 29, 2009, which was published in accordance with PCT Article 21(2) on Jul. 7, 2011 in English.FIELD OF THE INVENTION[0002]The present invention relates in general to a multi-carrier communication system, and more particularly to a channel estimation method and apparatus for an Orthogonal Frequency Division Multiplexing (OFDM) communication system.BACKGROUND OF THE INVENTION[0003]Orthogonal Frequency Division Multiplexing (OFDM) is a typical multi-carrier modulation technology and a very promising access scheme for wideband wireless communication networks. OFDM has been adopted by numbers of international standards such as DVB (Digital Video Broadcasting) and wireless LAN (Local Area Network). It is also a promising technique for future wideband wireless communication systems, such as digital TV (Television) broadcasting and 4th generation wireless networks.[0004...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04J11/00H04L25/02H04L27/26
CPCH04L27/2647H04L25/0232H04L25/022H04L25/0204H04L25/0222
Inventor NIU, BENLIU, GANGZOU, LI
Owner INTERDIGITAL MADISON PATENT HLDG