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Method of selecting a receiving path and receiving device comprising several receiving paths

A technology for receiving path selection and receiving, which is applied in the field of receiving path selection and receiving equipment including multiple receiving paths, and can solve the problems of reducing the transmission bit rate and not being able to determine the correctable limit of the path

Inactive Publication Date: 2005-03-23
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technique requires very long sequences to select paths
Now, the increase in the evaluation path time reduces the overall transmission bit rate
Also, this evaluation is done for the error correction rate, but cannot determine if the path is within correctable limits

Method used

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  • Method of selecting a receiving path and receiving device comprising several receiving paths
  • Method of selecting a receiving path and receiving device comprising several receiving paths
  • Method of selecting a receiving path and receiving device comprising several receiving paths

Examples

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Embodiment Construction

[0023] figure 1 The progression of the transfer sequence is shown. Divide the sent message into three bursts. The first burst E1 is used for evaluating the first receive path and the second burst E2 is used for evaluating the second receive path. Then, a burst comprising useful data is sent in order to receive it on the optimal receive path.

[0024] Bursts E1 and E2 are identical and of shorter duration so as not to reduce the useful bit rate. As an example, E1 and E2 last 24 microseconds. The three bursts that make up the send message are separated by a very short duration, eg 2 microseconds, allowing time to switch the receive path. The messages sent may have a variable duration, for example up to 5 microseconds, so that the evaluation of both paths is valid from the beginning of the transmission to its end. The duration of the sent message can be longer if propagation conditions permit.

[0025] figure 2 shows a device for receiving multi-carrier modulated signals,...

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PUM

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Abstract

The invention provides a method of evaluating a path in a data-receiving system using multi-carrier modulation. A confidence indicator is determined for each data item received so as to provide a stream of confidence indicators parallel to the datastream received. The confidence indicators are ordered identical to the data received. The invention provides a device comprising means 110 for evaluating a confidence indicator for each carrier and means 121, 122 and 123 for laying out a stream of confidence indicators identical to a datastream received.

Description

technical field [0001] The invention relates to a method for selecting a reception path for a device having at least two reception paths. The invention also relates to a receiving device comprising at least two receiving paths using the selection method. Background technique [0002] Some transmission systems use frequency bands that are very sensitive to interference. In particular, this is the case for systems operating near 5GHz. Various solutions are known for making the transmission available. In these known solutions, better transmission performance can be achieved using multi-carrier modulation with information redundancy. It is also known to use multiple antennas by selecting the one that receives the best quality signal at the receiver. [0003] Known receiving systems use two switched antennas utilizing the same receiving channel. Provision is made to receive two consecutive test bursts in order to evaluate both receive paths before receiving a transmit burst....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04B7/08H04J1/02H04L1/00H04L1/06H04L27/26
CPCH04L1/0001H04L27/2647H04B7/0811H04L1/0071H04L1/0068H04L1/20H04L1/06H04L27/26
Inventor 萨米埃尔·吉尤阿帕特里克·洛佩斯樊尚·德穆兰帕特里克·丰泰内
Owner THOMSON LICENSING SA