Fast synchronous tracking method and device for TDD-OFDM downlink

A downlink, synchronous tracking technology, applied in the TDD-OFDM downlink downlink field, can solve the problems of complex device, large resource consumption, large storage space, etc.

Active Publication Date: 2017-10-10
西安宇飞电子技术有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, for a custom TDD-OFDM system, this device is too complex, consumes large resources, and requires a large storage space

Method used

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  • Fast synchronous tracking method and device for TDD-OFDM downlink
  • Fast synchronous tracking method and device for TDD-OFDM downlink
  • Fast synchronous tracking method and device for TDD-OFDM downlink

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[0095] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be constrained by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0096] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or mo...

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Abstract

The invention relates to a fast synchronous tracking method and device for a TDD-OFDM downlink. The method comprises the following steps of (S110) generating a synchronous sequence; (S120) mapping the synchronous sequence into a corresponding subcarrier to obtain a synchronous signal, putting the synchronous signal on a frame header of a radio frame and generating a TDD-OFDM downlink signal; (S130) carrying out initial capture on the link signal; (S140) carrying out accurate capture on the link signal; and (S150) keeping the link signal synchronous in real time. According to the fast synchronous tracking method for the TDD-OFDM downlink, initial capture is firstly carried out by using a conjugate associated characteristic window signal, accurate capture is carried out by using training sequence correlation (local matched filtering), and accurate real-time tracking is finally carried out by using a pilot frequency, fast capture for the TDD-OFDM downlink can be achieved and synchronous tracking is achieved.

Description

technical field [0001] The present invention relates to the field of TDD-OFDM downlink downlink, in particular to a fast synchronization tracking method and device for TDD-OFDM downlink. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) is Orthogonal Frequency Division Multiplexing technology. In fact, OFDM is MCM (Multi Carrier Modulation), a type of multi-carrier modulation. The basic principle of OFDM is to decompose a high-speed data stream into N parallel low-speed data streams, and transmit them simultaneously on N subcarriers. [0003] In the TDD-OFDM downlink downlink time synchronization algorithm, for practical communication systems, it is unrealistic to use the blind estimation method for downlink time synchronization, and its computational complexity and precision cannot meet the actual needs. Typically a pilot sequence based synchronization algorithm is used. There are three kinds of downlink synchronization algorithms that can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04L27/26H04J3/06
CPCH04J3/0635H04L27/2675H04W56/00
Inventor 熊军
Owner 西安宇飞电子技术有限公司
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