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Doppler frequency deviation obtaining method and apparatus

A technology of Doppler frequency offset and acquisition method, which is applied in the direction of multi-frequency code system, digital transmission system, electrical components, etc., can solve the problems of poor estimation performance and limited development of OFDM technology, and achieve the effect of high precision

Inactive Publication Date: 2008-05-21
新奇点智能科技集团有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of the OFDM technology itself, the length of the CP is usually short. Therefore, the traditional Doppler frequency offset estimation method has relatively poor estimation performance and is severely limited by the development of OFDM technology.

Method used

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  • Doppler frequency deviation obtaining method and apparatus
  • Doppler frequency deviation obtaining method and apparatus
  • Doppler frequency deviation obtaining method and apparatus

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Embodiment Construction

[0045] The embodiments of the present invention will be further described below in conjunction with the drawings and examples.

[0046] The invention provides a Doppler frequency offset acquisition method of a CMMB system, which uses the delay extension parameter value of a received signal, the initial position of a synchronization signal in a time slot and the signal-to-noise ratio value to acquire the Doppler frequency offset.

[0047] There are many kinds of OFDM systems, and specific embodiments of the present invention are different for different kinds of OFDM systems. In the following, we describe the situation that the present invention is applied to an OFDM system such as CMMB.

[0048] The frame structure of the physical layer in the CMMB system is shown in Figure 1. Divide 1 second into 40 time slots, each time slot consists of 1 beacon and 53 OFDM symbols. As shown in Figure 2, each beacon consists of a TxID (Transmitter Identification Sequence) and two identical ...

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Abstract

The invention discloses an acquisition method of Doppler frequency offset, which comprises the following steps: a time delay expansion parameter value of receiving a signal, an original position and a signal-to-noise ratio value of synchronous signal in time slot are acquired; based on the acquired time delay expansion parameter value, the original position and signal-to-noise ratio value of the synchronous signal in time slot, the Doppler frequency offset is acquired. The invention also discloses an acquisition device of Doppler frequency offset used to achieve the acquisition method of Doppler frequency offset. With the invention applied, the acquisition of the Doppler frequency offset does not rely on the OFDM, and can achieve high accuracy of the Doppler frequency offset. Therefore, the lack of CMMB system Doppler frequency offset acquisition method are made up, and the shortcomings of traditional Doppler frequency offset acquisition method are avoided.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a Doppler (Doppler) frequency offset acquisition method and device. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system is a multi-carrier communication system that can be used to transmit large data rates, such as the European DVB-T (Digital Video Broadcasting, digital video broadcasting) system, China The CMMB (ChinaMobile Multimedia broadcasting, China Mobile Multimedia Broadcasting) system and so on all adopt OFDM technology as the modulation transmission technology. [0003] In the OFDM system, the pilot frequency (Pilot) is usually inserted in the frame structure of the signal transmitted by the transmitter in advance, and the pilot frequency is used to assist the receiver to perform fast and efficient channel estimation, so that it can resist a variety of channel types, such as high-speed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/00
Inventor 张辉王西强孟斐徐彧
Owner 新奇点智能科技集团有限公司