Synchronous signal sending method of orthogonal frequency division mutiplex system

A technology of orthogonal frequency division and synchronization signal, applied in the direction of multi-frequency code system, etc., can solve the problem of increasing system overhead, and achieve the effect of small extra overhead, fast speed and high precision

Active Publication Date: 2013-03-27
BEIJING ZHIGU TECH SERVICE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] When designing a dedicated synchronization signal, the synchronization signal sent by the transmitter is known to the receiver, which can avoid the disadvantages of the first method and can achieve high accuracy, but it increases the overhead of the system

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  • Synchronous signal sending method of orthogonal frequency division mutiplex system
  • Synchronous signal sending method of orthogonal frequency division mutiplex system
  • Synchronous signal sending method of orthogonal frequency division mutiplex system

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Embodiment Construction

[0020] In a cellular system, in order to facilitate channel quality measurement or channel estimation, the transmitter will periodically send a certain number of pilot signals, and the pilot signals are also known to the receiver. Therefore, if the pilot signal is sent reasonably so that it can not only perform channel quality measurement and channel estimation, but also have a synchronization function, the synchronization signal transmission method of the OFDM system of the present invention uses the pilot signal in the OFDM system. The frequency signal is used as the synchronization signal, and the functions of channel quality measurement, channel estimation and synchronization are realized at the same time, so that the user and the system can obtain synchronization quickly and accurately, and at the same time, it does not add too much overhead to the system.

[0021] In the synchronization signal transmission method of the OFDM system of the present invention, for the conven...

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Abstract

In the invention, in system bandwidth the pilot frequency signals used for implementing the synchronization of time and / or frequency are transmitted on the pilot frequency carrier; on the interval between two pilot frequency carriers there is only no-data-aided carrier that doesn't send any data.

Description

technical field [0001] The present invention relates to the field of digital communication, in particular to a synchronization signal transmission method based on Orthogonal Frequency Division Multiplex (OFDM) technology. Background technique [0002] As a multi-carrier transmission mode, OFDM converts a high-speed transmission data stream into a set of low-speed parallel transmission data streams, which greatly reduces the sensitivity of the system to the frequency selectivity of multipath fading channels. The introduction of the cyclic prefix has enhanced the ability of the system to resist Inter-symbol Interference (ISI). In addition, the high bandwidth utilization rate and simple implementation make OFDM more and more widely used in the wireless communication domain. For example, WLAN system, WiMax system based on Orthogonal Frequency Division Multiple Access, etc. are all systems based on OFDM technology. [0003] "3GPP, TR25.814 "Physical Layer Aspects for Evolved UTR...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 夏树强赵盟胡留军
Owner BEIJING ZHIGU TECH SERVICE
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