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Inter-carrier interference in OFDM system

A technology of inter-carrier interference and orthogonal frequency division, which is applied in the field of inter-carrier interference measurement and can solve problems such as loss of orthogonality at the transmitter and complicated situations.

Active Publication Date: 2008-12-31
KEYSIGHT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Any imperfection or error in these areas will result in a loss of orthogonality at the transmitter
The situation is further complicated by the different modulation types and frequency bands that OFDM systems may employ

Method used

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  • Inter-carrier interference in OFDM system

Examples

Experimental program
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Embodiment Construction

[0018] The embodiments of the present invention are described below with reference to the drawings.

[0019] FIG. 2 shows a block diagram of an OFDM system 200. The OFDM system 200 includes a transmitter 210, a receiver 220, and a channel 230. The transmitter 210 includes an encoder 211, an S / P converter 212, an IFFT module 213, a P / S converter 214, and a D / A converter 215. The receiver 220 includes a decoder 221, a P / S converter 222, an FFT module 223, an S / P converter 224, and an A / D converter 225. The structures and functions of the components and / or modules 211-215 and 221-225 can be implemented using known technologies, and therefore will not be described in detail below.

[0020] In addition, the OFDM system 200 also includes an ICI measurement system according to an embodiment of the present invention. The ICI measurement system is used to perform ICI measurement of the OFDM system 200. It can be seen from FIG. 2 that the ICI measurement system includes a test symbol genera...

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Abstract

The invention provides a system for measuring the inter-carrier interference (ICI) of an OFDM system, comprising a test symbol generator which is coupled to the transmitter of the OFDM system and used for generating an N multiplied by N orthogonal matrix composed of N multiplied by N test symbols which are sent to a receiver of the OFDM system by the transmitter in the manner of a test symbol flow. The system also comprises an ICI measurement module which is coupled to the receiver and used for detecting N multiplied by N test symbols received by the receiver and arranging the test symbols into a receiving matrix in the same manner as the orthogonal matrix of the transmitter. The outputting and receiving matrix of the ICI measurement module is used as the ICI matrix of the OFDM system, wherein, the element of the ICI matrix in the row k and the line I represents the interference of the sub-carrier I to the sub-carrier k, wherein, k is not equal to I.

Description

Technical field [0001] The present invention relates to high-speed wireless communication, and more specifically to inter-carrier interference measurement in an orthogonal frequency division multiplexing (OFDM) system. Background technique [0002] The OFDM system can be used in high-speed wireless telecommunication systems. In the transmitter of the OFDM system, a data stream with a high transmission rate is divided into multiple data streams with a lower transmission rate. These data streams are simultaneously transmitted in parallel using multiple orthogonal subcarriers. Then in the receiver of the OFDM system, these data streams are recombined to obtain the original data stream. [0003] FIG. 1 shows a discrete-time baseband equivalent model of a typical OFDM system 100. The OFDM system 100 includes a transmitter 110, a receiver 120, and a channel 130. The transmitter 110 includes an encoder 111, a serial to parallel (S / P) converter 112, an inverse fast Fourier transform (IFF...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03H04B1/707
CPCH04L5/0007H04L27/2647
Inventor 沈丹勋赵旭孔宏伟
Owner KEYSIGHT TECH