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Method for extracting variable reference pattern

An extraction method and a technology of reference mode, which are applied in the direction of adjustment of transmission mode, transmission monitoring, orthogonal multiplexing system, etc., and can solve the problem of fixed physical transmission channel and so on.

Inactive Publication Date: 2004-05-12
WAVECOM SA
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Problems solved by technology

They concluded that a disadvantage of the previously described techniques is that the reference structure is always fixed for a certain physical transport channel
[0010] Therefore, another disadvantage of the previously described technique is that the reserved reference symbol sequence does not depend on the characteristics of the transmission channel, which are related on the one hand to the relevant communication terminal environment and on the other hand to the mobile speed of said terminal related

Method used

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  • Method for extracting variable reference pattern
  • Method for extracting variable reference pattern
  • Method for extracting variable reference pattern

Examples

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Embodiment Construction

[0066] The general principle of the invention is to provide an adaptation of the reference structure of the signals exchanged between a radio communication device and a remote base station, according to the characteristics of the transmission channel.

[0067] figure 1 , 2 A transmission embodiment of a multiplex data transmission between a stationary transmitter and a mobile radio communication terminal is shown, as well as the distribution mechanism of a reference structure adapted to the transmission.

[0068] Transmitter 1 transmits digital data to mobile communication terminal 2 . The terminal 2 may be mounted on a car driven by a user, for example. The signal transmitted by station 1 takes a different route before reaching terminal 2. In particular, the signal can be reflected multiple times by reflectors 3 , 4 and 5 . Said signal can also be diffracted by obstacles 7 and diffused locally in the area 6 near the terminal 2 . Thus, depending on the route the signals t...

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Abstract

The invention concerns a method for extracting a sequence of pilot symbols enabling to estimate the transfer function of a transmission channel, at least a radiocommunication device communicating through said channel with a remote station, the latter regularly delivering to said radiocommunication device a reference pattern. The invention is characterised in that the structure of said reference pattern is variable, depending on at least one characteristic of said transmission channel.

Description

technical field [0001] The invention relates to the field of digital data transmission. More precisely, the invention relates to estimating the transfer function of a transmission channel, and maintaining synchronization of radio communication devices that can exchange digital data with remote base stations over said channel. Background technique [0002] In a traditional digital communication system, a reference symbol sequence is often used, which is recognizable by a receiver in a series of data transmitted by a transmitter, and is called a reference symbol or a pilot symbol. The reference symbols allow the receiver to properly estimate the transmission channel, thus ensuring smooth demodulation of the received signal. [0003] For communication systems implementing time-variable transmission channels, it has been considered to distribute reference symbols at different positions within a set of exchanged signals. [0004] In these various communication systems, the stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/20H04B1/707H04B17/00H04J11/00H04J13/00H04L1/00H04L27/26
CPCH04L1/0007H04B7/26
Inventor 米歇尔·阿拉德纳塔莉·古达尔
Owner WAVECOM SA
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