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Method to improve the channel estimate in broadband simo/mimo cellular radio networks during abrupt interference variations

A technology for interference estimation and power grids, applied in channel estimation, radio transmission systems, electrical components, etc., can solve problems such as system performance degradation, interference communication, loss, etc.

Inactive Publication Date: 2007-10-17
NOKIA SIEMENS NETWORKS ITAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the BER value is greater than the maximum allowable threshold, the communication conducted on the interfering channel will be lost, and the system performance will be degraded accordingly

Method used

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  • Method to improve the channel estimate in broadband simo/mimo cellular radio networks during abrupt interference variations
  • Method to improve the channel estimate in broadband simo/mimo cellular radio networks during abrupt interference variations
  • Method to improve the channel estimate in broadband simo/mimo cellular radio networks during abrupt interference variations

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Embodiment approach

[0145] as matrix R STXT Replacement of (l), W×W time correlation matrix and N T ×N T A spatial correlation matrix can be used:

[0146] R T ( l ) = ( 1 - μ T ) Σ n T = 1 N T H ~ w ( n T ) ( l ) H H ~ w ( n T ) ( l ...

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Abstract

The invention relates to multi signalpath response which is evaluated in the way of MIMO of a wireless receiver used in broadband honeycomb radio net. Relativity of interference covariance matrix is calculated at each new symbol and compared with a threshold to determine whether interference has significant change. A first event is mainly for reinitialization of the interference covariance matrix, or actual value is used for renewing operation average value of the interference covariance matrix. The renewing or reinitialization interference covariance matrix and emission autocorrelative matrix of pilot sequence (storing in a receiver) are used in front of channel matrix for downward rank to submit evaluation to mode filtering so as to whiten evaluated singalpath matrix. The premier space and / or time correlation is reintroduced to downward rank channel matrix. The channel matrix is first evaluated in dispersed time domain, and then is submitted to DFT used for changing of a whole bandwidth, which can be used correctly by the receiver.

Description

technical field [0001] The present invention relates to the field of wireless telecommunication networks, more precisely to a method of improving channel estimation in wideband SIMO / MIMO cellular radio networks during sudden interference variations (acronyms used are given at the end of the description). The present invention is suitable for, but not limited to, use in base station receivers for broadband multi-cell wireless systems based on frequency reuse within adjacent cells and, if desired, using SDMA techniques in the same cell. The invention has particular application in cellular systems based on: [0002] · OFDM modulation and TDMA access at the physical layer, such as WiMAX and IEEE 802.16-2004 Part 16: Air Interface for Fixed Broadband Wireless Access Systems for Fixed Subscriber Stations. [0003] • OFDMA-TDMA access at the physical layer, such as WiMAX and IEEE 802.16e Part 16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems for Fixed and Mobi...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L1/06H04B7/04H04L12/28
CPCH04B7/0417H04L25/0224H04B7/0439H04L25/0204
Inventor 莫妮卡·尼科利路易吉·桑皮特罗克劳迪奥·桑塔斯萨里亚奥斯瓦尔多·西米恩昂伯托·斯帕诺利尼
Owner NOKIA SIEMENS NETWORKS ITAL
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