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Using the preamble in an OFDM-based communications system to indicate the number of guard tones

A technology of protection tones and preambles, applied in the field of indicating the number of protection tones and preambles, can solve the problems of loss of decoding performance and prolongation of system acquisition delay.

Active Publication Date: 2009-09-30
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The result of this trade-off is an unnecessary loss of decoding performance on the PBCCH, thereby prolonging the system acquisition delay

Method used

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  • Using the preamble in an OFDM-based communications system to indicate the number of guard tones
  • Using the preamble in an OFDM-based communications system to indicate the number of guard tones
  • Using the preamble in an OFDM-based communications system to indicate the number of guard tones

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Embodiment Construction

[0037] The making and using of the presently preferred embodiments are discussed in detail below. It should be appreciated, however, that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention.

[0038] The present invention provides a unique method and system for indicating the number of guard tones on a preamble in an OFDM or OFDMA based communication system. It is to be understood, however, that the following disclosure provides various embodiments or examples for implementing various features of the invention. Specific examples of components, signals, messages, protocols, and settings are described below to simplify the present disclosure. These are of course only examples and are not intended to limit the invention described according to the claims. ...

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Abstract

Indicating the number of guard tones on the preamble frames is described for an OFDM or ODFMA based wireless communication system. The information of the number of guard tones or the range of the number of guard tones used on certain channels is indicated before the mobile station demodulates those channels. The mobile station uses this information to minimize the loss of modulation symbols when decoding those channels.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Application No. 60 / 884,412, filed January 10, 2007, entitled "METHOD FORINDICATING THE NUMBER OF GUARD TONES ON THE PREAMBLE INAN OFDM BASED COMMUNICATION SYSTEM," and filed November 2, 2007 Priority to U.S. Patent Application No. 11 / 934,401, entitled "USING THEPREAMBLE IN AN OFDM-BASED COMMUNICATIONS SYSTEM TOINDICATE THE NUMBER OF GUARD TONES," the contents of which are hereby incorporated by reference. technical field [0003] The present invention relates generally to wireless communication systems and more particularly to the use of preambles to indicate guard tone numbers in Orthogonal Frequency Division Multiple Access (OFDMA) based wireless communication systems. Background technique [0004] In broadband wireless communication systems, signals are often weakened due to frequency selective fading caused by multipath transmission. Frequency selective fadin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/32
CPCH04L27/261H04L27/2647
Inventor 杨云松卢建民
Owner HUAWEI TECH CO LTD