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Estimation of a signal-to-interference plus noise ratio at the output of an OFDM CDMA receiver

A technology of OFDM-CDMA and signal, which is applied in the field of signal processing and can solve the problem of loss of code orthogonality information, etc.

Inactive Publication Date: 2007-08-22
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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  • Description
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Problems solved by technology

[0044] With this estimation, the orthogonality information of the code is also lost

Method used

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  • Estimation of a signal-to-interference plus noise ratio at the output of an OFDM CDMA receiver
  • Estimation of a signal-to-interference plus noise ratio at the output of an OFDM CDMA receiver
  • Estimation of a signal-to-interference plus noise ratio at the output of an OFDM CDMA receiver

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Embodiment Construction

[0083] We will describe a method of estimating the RSIB ratio according to the present invention.

[0084] The first step is to perform a modularization of the channels visible from the output of the FFT, followed by a modularization of the signal received at the output of the associated means (block 46 in FIG. 7 ).

[0085] Then, we will explain the method of estimating RSIB according to the present invention.

[0086] The following elements will be used throughout the remainder of this specification:

[0087] -gi(k): the coefficient of the equalizer for the kth subcarrier of the ith OFDM symbol,

[0088] -p0: the power of the spreading signal of the spreading code used to calculate the RSIB ratio,

[0089] The average power of the spreading code,

[0090] -ΔF=F 01 -F 02 : carrier frequency deviation between transmitter and receiver,

[0091] -ΔT: Deviation of sampling clock between transmitter and receiver,

[0092] -σ 2 : the variance of the additive Gaussian nois...

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Abstract

The invention relates to a method for estimating the SINR ratio of a type-5 OFDM CDMA transmission using a spreading codes (sk), wherein said ratio is evaluated independently of the value of said codes.

Description

technical field [0001] The invention relates to the field of signal processing. [0002] Specifically, the object is to provide a method for estimating the Signal-to-Interference-Noise Ratio (RSIB) of the downlink in a multi-carrier system with CDMA-type multiple access. [0003] The present invention is used in radio communication, i.e. a communication system constructed using CDMA multiple access technology combined with OFDM transmission: [0004] -MC-CDMA [0005] -MC-DS-CDMA [0006] - 2D time / frequency extension [0007] The present invention takes into account the effect of synchronization errors, where the spreading codes are assumed to be orthogonal. This involves the offset between the transmitter carrier frequency and the receiver carrier frequency and the offset between the transmitter sampling clock and the receiver sampling clock. [0008] For example, RSIB (corresponding to the English abbreviation SINR) is used to estimate the binary error rate at the rece...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04L1/20H04B1/707H04B1/7103H04J13/00
CPCH04L1/20H04L5/0021H04B17/336H04B17/006
Inventor 马蒂厄·德内斯迪米特里·克特纳斯吕克·马雷优素福·纳西夫
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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