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Method and corresponding system for broadband co-frequency interference noise estimation and interference suppression

A technology of interference noise and co-channel interference, which is applied in the field of OFDM or OFDMA systems and can solve problems such as inaccurate estimation of interference noise characteristics

Active Publication Date: 2012-05-30
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for estimating broadband co-channel interference noise and a corresponding system to solve the problem of inaccurate estimation of interference noise characteristics when there is co-channel interference in adjacent cells

Method used

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  • Method and corresponding system for broadband co-frequency interference noise estimation and interference suppression
  • Method and corresponding system for broadband co-frequency interference noise estimation and interference suppression
  • Method and corresponding system for broadband co-frequency interference noise estimation and interference suppression

Examples

Experimental program
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Effect test

application example 1

[0151] Such as image 3 As shown, the interference suppression area in this example is interference suppression area pattern 1, which includes 15 consecutive OFDM / OFDMA symbols in the time domain and 4 consecutive subcarriers in the frequency domain, which carry one data stream.

[0152] In this example, the interference suppression area is divided into 5 interference noise estimation units on average, and the indices of the 20 pilot subcarriers included in the interference suppression area belong to 5 pilot index sets respectively, that is, 1 to 4 belong to Ω 1 , 5~8 belong to Ω 2 , 9~12 belong to Ω 3 , 13~16 belong to Ω 4 , 17~20 belong to Ω 5 .

[0153] When performing interference noise estimation:

[0154] The interference noise covariance matrix of each data subcarrier position in the first interference noise estimation unit is Have:

[0155] R ^ NI - D ...

application example 2

[0166] The interference suppression area in this example is interference suppression area style 1. Such as Figure 4 As shown, the interference suppression area is divided into three interference noise estimation units, and the indices of the 20 pilot subcarriers included in the interference suppression area belong to three pilot index sets respectively, among which: 1-4 belong to Ω 1 , 5~12 belong to Ω 2 , 13~20 belong to Ω 3 .

[0167] When performing interference noise estimation:

[0168] The interference noise covariance matrix of each data subcarrier position in the first interference noise estimation unit is Have:

[0169] R ^ NI - D 1 = β 11 Σ i = 1 4 R ^ ...

application example 3

[0176] The interference suppression area in this example is interference suppression area style 1. Such as Figure 5 As shown, the interference suppression area is divided into one interference noise estimation unit, and the indices of the 20 pilot subcarriers included in the interference suppression area belong to one pilot index set, and 1 to 20 all belong to Ω 1 .

[0177] When performing interference noise estimation, the interference noise covariance matrix of each data subcarrier position in the interference noise estimation unit is Have:

[0178] R ^ NI - D 1 = β 11 Σ i = 1 20 R ^ NI - P (...

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Abstract

A method and a corresponding system for broadband co-frequency interference noise estimation and interference suppression are provided, which are applied to estimating interference noise for one data stream borne in an interference suppression area. The method for broadband co-frequency interference noise estimation comprises that: for each pilot subcarrier corresponding to the data stream, an interference noise covariance matrix at the position of the pilot subcarrier is calculated and obtained according to a pilot signal sent by a transmitting terminal on the pilot subcarrier, a receiving signal on the pilot subcarrier and a channel coefficient estimation value at the position of the pilot subcarrier; for each data subcarrier corresponding to the data stream, the weighted average of interference noise covariance matrices at the positions of all pilot subcarriers corresponding to the data stream is used as an interference noise covariance matrix at the position of the data subcarrier; further, the signal estimation is performed on the data stream based on the obtained interference noise covariance matrix. In the invention, the interference noise can be accurately estimated and the effect of interference suppression can be improved when co-frequency interference exists between the adjacent cells.

Description

technical field [0001] The present invention relates to OFDM ((Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) or OFDMA (Orthogonal Frequency Division Multiple Access, Orthogonal Frequency Division Multiple Access) system, specifically, relates to broadband co-frequency interference in OFDM / OFDMA system A method for noise estimation and interference suppression, and a corresponding system. Background technique [0002] Multi-antenna technology is a major breakthrough in smart antenna technology in the field of wireless mobile communication. This technology can double the capacity and spectrum utilization of the communication system without increasing the bandwidth, and can also use multi-path to alleviate multi-path fading. , and can effectively eliminate channel interference, improve channel reliability, and reduce bit error rate. It is a key technology adopted by the new generation of mobile communication systems. It has been widely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L25/02H04L27/26
CPCH04B17/005H04L25/0204H04L25/0224H04J11/0046H04B17/345
Inventor 朱登魁宁迪浩肖华华鲁照华
Owner ZTE CORP
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