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A fast synchronization tracking method and device for tdd-ofdm downlink

A downlink and synchronous tracking technology, which is applied in the field of TDD-OFDM downlink downlink, can solve the problems of complex devices, large resource consumption, and large storage space

Active Publication Date: 2021-05-28
西安宇飞电子技术有限公司
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  • Abstract
  • Description
  • 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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  • A fast synchronization tracking method and device for tdd-ofdm downlink
  • A fast synchronization tracking method and device for tdd-ofdm downlink
  • A fast synchronization tracking method and device for tdd-ofdm downlink

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Embodiment Construction

[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 present invention relates to a fast synchronization tracking method and device for TDD-OFDM downlink. The method includes the following steps: S110, generating a synchronization sequence; S120, mapping the synchronization sequence to a corresponding subcarrier to obtain a synchronization signal , the synchronization signal is placed in the frame header of the wireless frame to generate a TDD-OFDM downlink signal; S130, initially capture the link signal; S140, accurately capture the link signal; The above link signals are kept synchronized in real time. The fast synchronous tracking method for the TDD-OFDM downlink of the present invention first uses the conjugate correlation characteristic window signal for initial capture, then uses the training sequence correlation (local matched filter) for precise capture, and finally uses the pilot frequency for accurate real-time tracking , not only can achieve fast acquisition for TDD‑OFDM downlink, but also realize synchronous tracking.

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 Patents(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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