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Doppler diversity receiving method and device based on matched filtering

A technology of Doppler diversity and matched filtering, which is applied in the field of Doppler diversity receiving method and device based on matched filtering, can solve the problems of performance limit and inability to fully and effectively use diversity resources, and reduce performance loss and calculation The number of times, the effect of improving system performance

Active Publication Date: 2021-09-24
HANGZHOU DIANZI UNIV
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Problems solved by technology

However, in the traditional Doppler diversity reception structure, the system obtains diversity gain by shifting the frequency spectrum of the received signal, but this method cannot fully and effectively utilize the diversity resources brought about by frequency offset, and there are certain performance limit

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  • Doppler diversity receiving method and device based on matched filtering
  • Doppler diversity receiving method and device based on matched filtering
  • Doppler diversity receiving method and device based on matched filtering

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Embodiment Construction

[0062] The following preferred embodiments are further descriptions of the technical solutions provided by the present invention, but should not be construed as limitations on the invention.

[0063] like Figure 1-2 As shown, a kind of Doppler diversity receiving method based on matched filtering of the present invention, specifically comprises the following steps:

[0064] Step 1: M base stations precode the transmitted signal first, and perform oversampling operation with a sampling rate of α. Assuming that the synchronization position of the receiver is aligned with the signal received from the first base station, let the received signal in the mobile station be x(n).

[0065] Step 2: The received signal enters a simplified Doppler diversity receiving structure. The mobile station first performs the reception signal The frequency shift operation, the i-th signal after different frequency shifts can be expressed as

[0066]

[0067] Among them, 0≤n≤N-1, 0≤i≤N-1, i...

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Abstract

The invention discloses a Doppler diversity receiving method and device based on matched filtering, and the method comprises the steps: 1, carrying out the precoding of a transmitted signal through a base station in a multi-antenna system, and carrying out the oversampling operation; 2, the received signal entering a simplified Doppler diversity reception structure, and then the mobile station performing different frequency shift processing on the received signal to obtain a signal on a diversity branch; 3, performing matched filtering preprocessing on the received signals on different branches after frequency shift, and de-sampling the signals; 4, performing weighted combination on different branches by adopting a maximum ratio combination mode, performing FFT (Fast Fourier Transform) after serial-to-parallel conversion, and obtaining an output signal through parallel-to-serial conversion; and 5, after the simplified Doppler diversity reception structure, the mobile station decoding the output signal through the estimated channel parameter, and carrying out decision output. According to the invention, the performance loss caused by Doppler extension is reduced, and the system performance is improved.

Description

technical field [0001] The invention belongs to the technical field of design of a receiving system in a high-speed mobile environment, and in particular relates to a matching filter-based Doppler diversity receiving method and device. Background technique [0002] In high-speed mobile communication systems, the Doppler effect brought about by the high mobility of vehicles will greatly reduce the signal detection quality of the system, thus seriously affecting the reliability of communication system transmission. Due to the influence of Doppler frequency shift, the system performance is severely degraded, so the receiver needs to estimate and compensate the frequency offset of the signal before decoding. By estimating and compensating the Doppler frequency shift, it can resist multiple The effect of the Puller effect. Generally, the frequency offset in a communication system is mainly generated by the following factors: phase noise (Phase noise, PN), carrier frequency offse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/08H04B7/12
CPCH04B7/08H04B7/12
Inventor 曾嵘邵智敏杭潇易志强
Owner HANGZHOU DIANZI UNIV
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