Noise power interpolation in a multi-carrier system

A technology of noise power and estimated value, which is applied in the field of receiving OFDM type signals, and can solve the problems of reducing the signal-to-noise ratio, the change of the received signal and the transmitted signal, etc.

Inactive Publication Date: 2008-12-10
CASSIDIAN SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These disturbances can cause the received signal to change compared to the transmitted signal
These received signal variations degrade the signal-to-noise ratio

Method used

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  • Noise power interpolation in a multi-carrier system
  • Noise power interpolation in a multi-carrier system
  • Noise power interpolation in a multi-carrier system

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Embodiment Construction

[0032] The application of the present invention in a multi-carrier system such as an OFDM (Orthogonal Frequency Division Multiplexing) system will be described below. The system can be used for traditional OFDM transmission, and can also be used for OFDM / IOTA (Isotropic Orthogonal Transform Algorithm) type transmission and OFDM / OQAM (Offset Quadrature Amplitude Modulation, Offset Quadrature Amplitude Modulation) type transmission. , published in June 1995 by Bernard LE FLOCH et al. in the paper entitled "Coded Orthogonal Frequency Division Multiplex" ("Coded Orthogonal Frequency Division Multiplex", Bernard LEFLOCH et al. , Proceedings of the IEEE, Vol.83, No.6, June 1995) gave an example definition of an OFDM-structured orthogonal time / frequency network. In particular, document FR19950005455 describes a structure suitable for OFDM / IOTA type transmission.

[0033] This description is not restrictive, and it is to be noted that the invention may be applied simply and effective...

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Abstract

A signal is received in a telecommunication network in the form of P signals received on P corresponding antennas, where P is greater than or equal to 1. The received signals correspond to a multi-carrier signal transmitted in the form of frames comprising symbols occupying corresponding positions distributed along a time axis and along a frequency axis; a frame comprising M blocks each having atleast N reference symbols. The reference symbols in each of the blocks satisfy a first maximum spacing between each other along the time axis and a second maximum spacing between each other along thefrequency axis, less than a first value and a second value respectively, M being an integer number equal to at least two. M estimated noise power values are determined at frame level, each related toone of the M emitted reference symbol blocks. Values of the estimated noise power for the other symbols in the frame are then obtained from the determined estimated noise power values .

Description

technical field [0001] The invention relates to the reception of multi-carrier wireless communication signals, in particular of OFDM (Orthogonal Frequency Division Multiplexing) type signals. The invention is applicable to telecommunication networks, and in particular aims to provide a method of receiving a signal and estimating a likelihood value of transmitted information based on an estimate of the noise power of the received signal. Background technique [0002] During the transmission of a signal in a wireless communication network, the signal is affected by the interference of the propagation channel in its propagation channel. These disturbances can cause the received signal to vary compared to the transmitted signal. These received signal variations degrade the signal-to-noise ratio. [0003] For example, a traditional way of suppressing the effect of propagation channel interference on the transmitted signal is to use a signal processing method that transforms the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26H04B7/08
CPCH04B7/08H04L27/2698H04B17/336
Inventor 菲利普·梅热克里斯托夫·布吕泰尔
Owner CASSIDIAN SAS
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