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Reduction of interference in an OFDM signal with weighting vectors evolving in vector subspaces

A vector and signal technology, applied in the field of iteratively reducing interference mixed with radio signals, can solve problems such as signal reception degradation, high decoding error rate, etc.

Inactive Publication Date: 2011-01-05
CASSIDIAN SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During signal transmission, noise and interference experienced by the signal between the transmitter and receiver degrade signal reception
Insufficient handling of noise and interference leads to high decoding error rates

Method used

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  • Reduction of interference in an OFDM signal with weighting vectors evolving in vector subspaces
  • Reduction of interference in an OFDM signal with weighting vectors evolving in vector subspaces
  • Reduction of interference in an OFDM signal with weighting vectors evolving in vector subspaces

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Embodiment Construction

[0036] In general, the invention described hereinafter relates to a radio communication receiver in a digital cellular radio communication network. The receiver has at least two receive antennas and communicates with a transmitter having one or more transmit antennas. For example, the transmitter is a base station and the receiver is a mobile terminal.

[0037] In a first example, the radio communication network is a digital cellular radio communication network, such as a GSM type (“Global System for Mobile Communications”) or UMTS type (“Universal Mobile Telecommunications System”) or a WLAN type wireless local area network (“Wireless Local Area Network”) Or WIMAX class ("Worldwide Interoperability for Microwave Access").

[0038]In a second example, the radio communication network is a private wireless local network without any infrastructure. The transmitter and receiver communicate directly with each other directly and autonomously without the need for any intermediate c...

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Abstract

To reduce interference in signals (r1, r2) received by a receiver through a propagation channel, each comprising symbols distributed according to frequency and time dimensions and corresponding to one and the same signal emitted, the receiver weights an estimate (d) of the signal emitted and the signals received by weighting vectors (w1, W2, wd) evolving in vector subspaces representing the frequency variations and time variations of the channels for propagating the signals between an emitter and the receiver. These vector subspaces are defined by matrices some of whose columns are deleted according to frequency and time constraints of the channel. The receiver minimizes a function of the difference between the sum of weighted signals received and the weighted estimate of the signal emitted so as to estimate the signal emitted as a function of the weighting vectors and of the signals received.

Description

technical field [0001] The invention relates to reducing interference of radio signals comprising symbols distributed separately according to frequency and time dimensions. These symbols have, for example, been subjected to modulation according to Orthogonal Frequency Division Multiplexing, OFDM. More specifically, the invention relates to iteratively reducing interference mixed with radio signals. Background technique [0002] The invention finds application especially in the field of Professional Mobile Radio (PMR) systems. [0003] A radio signal modulated according to Orthogonal Frequency Division Multiplexing OFDM is distributed in a large number of subcarriers, the radio signal being in a wide frequency band with respect to the spacing between these subcarriers. Signals are thus transmitted by the transmitter on different subcarriers to enable processing of the signal received by the receiver to recover the transmitted signal despite potentially damaging interference...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L25/03H04B7/08H04L5/00
CPCH04L2025/03617H04B7/0851H04B7/0857H04B1/123H04L2025/03414H04B7/068H04L25/03159H04B7/0854H04L1/06
Inventor L·费蒂P·梅热L·马蒂诺德
Owner CASSIDIAN SAS