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Pilot frequency signal sending method for orthogonal frequency division multiplex system

A pilot signal and orthogonal frequency division technology, applied in the field of pilot signal transmission based on orthogonal frequency division multiplexing technology, can solve the problems of unable to obtain symbol timing, unable to extract pilot signal synchronization, etc., and achieve low power consumption , handle the effect of small delay

Inactive Publication Date: 2007-07-25
ZTE CORP
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Problems solved by technology

[0006] In order to solve the problem that in the existing OFDM system, because the pilot symbol is set at the beginning position of the frame / subframe, the mobile station cannot obtain the symbol timing before synchronizing with the system, so that the pilot signal cannot be extracted for synchronization. The purpose of the present invention is to Provide a pilot signal transmission method of OFDM system, so that the mobile station can accurately extract the pilot signal without considering the symbol timing and cyclic prefix length of the system

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  • Pilot frequency signal sending method for orthogonal frequency division multiplex system
  • Pilot frequency signal sending method for orthogonal frequency division multiplex system

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Embodiment Construction

[0017] In the OFDM system, each frame has a certain number of pilots, which not only can perform channel estimation and channel quality measurement, but also have the function of system synchronization (or some pilots have the function of system synchronization).

[0018] The pilot signal transmission method of the OFDM system of the present invention performs the following operations at the transmitting end: the pilot signal (or part of the pilot signal) is sent at the last OFDM symbol of each frame, which can be in the following ways accomplish:

[0019] All pilot signals in each frame are sent on the last OFDM symbol of that frame; or

[0020] The pilot signal with system synchronization function in each frame (or any part of the pilot signals among all the pilot signals with system synchronization function in each frame) is sent on the last OFDM symbol of each frame, and other pilot signals are transmitted in other OFDM sent on the symbol.

[0021] When a frame can be fu...

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Abstract

The method comprises: pilot frequency signals are mapped into the last OFDM symbol of frame or sub-frame and is sent out. Said pilot frequency signals can be all pilot frequency signals, all pilot frequency signals with system synchronous function or a part of pilot frequency signals with system synchronous function. By the invention mobile station extracts the signals without considering the influence to the symbol timing by the system symbol timing and the length of multi cycle prefix so as to ensure the performance of pilot frequency signals in channel estimation and channel quality measurement.

Description

technical field [0001] The present invention relates to the field of digital communication, in particular to a pilot signal transmission method based on Orthogonal Frequency Division Multiplex (OFDM) technology. Background technique [0002] As a multi-carrier transmission mode, OFDM can greatly reduce the sensitivity of the system to the frequency selectivity of multipath fading channels by converting the one-speed data stream into a low-speed parallel data stream, and the cyclic prefix The introduction of OFDM 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 wireless communication domains, such as , WLAN system, WiMax system based on Orthogonal Frequency Division Multiple Access, etc. are all systems based on OFDM technology. "3GPP, TR25.814 "Physical Layer Aspects for Evolved UTRA (release 7)" provides various technical soluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 夏树强
Owner ZTE CORP
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