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OFDM system interference detection method and system

An orthogonal frequency division and interference detection technology, applied in the field of communication, can solve the problems of reducing the efficiency of the system, the influence of the calculation of the power of the interference signal, and wasting the communication time of the system.

Active Publication Date: 2011-08-24
HUAWEI TECH CO LTD
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Problems solved by technology

For example, some QP schedules are tens of microseconds to hundreds of microseconds. In a WRAN with a large coverage area, the multipath delay may reach this time, or part of the QP time may be swallowed up, resulting in inaccurate interference detection results.
[0011] 3) The use of QP wastes the communication time of the system and reduces the efficiency of the system
[0019] Therefore, the calculation formulas of interference and noise power need to obtain the correct channel H k，i , but if there is interference, the OFDM system will have a large deviation when performing channel estimation, so it will directly affect the power calculation of the interference signal

Method used

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  • OFDM system interference detection method and system
  • OFDM system interference detection method and system
  • OFDM system interference detection method and system

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Embodiment Construction

[0095] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0096] In the present invention, it is assumed that the RU system is a system using OFDM technology, and is referred to as the present system. LU system, we call other system. As long as the signals of the LU system and the RU system are not correlated, we do not impose any restrictions on the technology used by the LU system. For example, the LU system can be single-carrier, multi-carrier, digital or analog. Such as figure 1 Shown is a schematic diagram of the interference detection system of the OFDM system of the present invention. OFDM is currently a popular technology, and its implementation and principles can be found in many monographs (for example, "OFDM Mobile Communication Technology Principles and Applications", written by Tong Xuejian and Luo Tao, People's Posts and Telecommunications Press). Therefore, we will not describe the OFDM technology in detai...

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Abstract

The provided interference detection method for OFDM system comprises: a. the sender sends OFDM signal to the receiver; and b. the latter executes orthogonal interference detection. This invention eliminates channel estimation and the relative error, has no effect on current data communication, and can combine with other signal process module fro more application.

Description

technical field [0001] The invention relates to the communication field, in particular to an interference detection method and system for an orthogonal frequency division multiplexing system. Background technique [0002] Currently, there are some license-free systems, such as WRAN, WLAN and other systems. The characteristic of this system is that its operating frequency band does not require authorization. In the working frequency band, these unlicensed systems need to coexist with licensed systems, for example, WRAN systems need to coexist with licensed system DTV. First of all, the license-free system cannot interfere with the licensed system. Once a licensed or authorized system is found to use a certain frequency band, the license-free system must unconditionally exit the frequency band and jump to other frequency bands to continue working. In this working mode, which is commonly referred to as the spectrum pool (SP) system, licensed users (LU) have the priority right...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B15/00H04L1/00
CPCH04L27/2647H04J11/0023
Inventor 吕林军戎军
Owner HUAWEI TECH CO LTD
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