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Pilot frequency sub carrier grouping method in orthogonal frequency division multiple access system

A technology of orthogonal frequency division multiple access and pilot sub-carriers, applied in the direction of signal channels, etc., can solve problems such as difficulties in effective signal reception

Inactive Publication Date: 2007-06-27
NTT DOCOMO INC
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In a conventional single-carrier system, if a higher bit transmission rate is used, it will bring difficulties to the effective reception of the signal due to inter-symbol interference (ISI) and deep frequency selective fading of the wireless channel

Method used

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  • Pilot frequency sub carrier grouping method in orthogonal frequency division multiple access system
  • Pilot frequency sub carrier grouping method in orthogonal frequency division multiple access system
  • Pilot frequency sub carrier grouping method in orthogonal frequency division multiple access system

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Embodiment Construction

[0051] In order to express the purpose, technical method and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] The main idea of ​​the present invention is: by dynamically changing the number of pilot symbols and the number of groups of pilot subcarriers of different users, a balance can be achieved between the number of users and / or the number of antennas that the system can support simultaneously and the spectral efficiency requirements of the system. A balance is achieved between the number of users and / or the number of antennas that the system can simultaneously support and the accuracy of wireless channel estimation, so that the OFDMA system can simultaneously support more users and / or the number of antennas.

[0053] The algorithm of the present invention is described in detail below, at first providing symbol definition:

[0054...

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Abstract

This invention relates to a packeting method for pilot sub-cariers in an OFDMA system, which packets sub-carriers in pilot symbols against user U, in which, the pilot packet number and symbols of U are variable and the sub-carrier numbers are equal, and the value sphere is 1-U, U is all the user number in the OFDMA system, besides, this invention also puts forward a channel estimation method, by this invention, user numbers and / or antennas supported simultaneously can be increased at the most and complete frequency domain channel response of all antennas of all users can be got with the help of part frequency resources distributed to each user, besides, it can avoid or reduce influence of narrow band interference.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more specifically, relates to a method for grouping pilot frequency subcarriers in an Orthogonal Frequency Division Multiple Access (OFDMA) system. Background technique [0002] As early as the 1960s, the Orthogonal Frequency Division Multiplexing (OFDM) system has been proposed as a high-speed transmission technology for wireless communication systems. In recent years, due to the rapid development of digital signal processing technology and ASIC technology, the realization of OFDM system has become a reality, and OFDM technology has received extensive attention again. [0003] At present, with the development of mobile communication systems, users have been provided with personal mobile communication terminals capable of supporting various new services. Because these services need to transmit a large amount of data, the mobile communication system requires a higher bi...

Claims

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Application Information

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IPC IPC(8): H04L5/02
Inventor 侯晓林张战加山英俊
Owner NTT DOCOMO INC
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