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Method for removing phase noise for time domain synchronous or thogonal frequency-division multiplex receiver and system and thereof

An orthogonal frequency division and phase noise technology, applied in the field of digital information transmission, can solve the problems of poor random phase noise elimination performance, difficult DVB-T compensation, and inability to reflect phase changes of received signals in time.

Inactive Publication Date: 2007-11-07
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But for the second part of the phase noise, DVB-T compensation is difficult, that is, DVB-T has poor performance in eliminating random phase noise, and cannot reflect the phase change of the received signal in time

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  • Method for removing phase noise for time domain synchronous or thogonal frequency-division multiplex receiver and system and thereof
  • Method for removing phase noise for time domain synchronous or thogonal frequency-division multiplex receiver and system and thereof
  • Method for removing phase noise for time domain synchronous or thogonal frequency-division multiplex receiver and system and thereof

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Embodiment Construction

[0076] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0077] A method for eliminating phase noise estimation proposed by the present invention is used in the implementation steps of an embodiment of a TDS-OFDM modulation system receiving end as follows:

[0078] (1) The splitter separates the received TDS-OFDM instant-domain synchronous OFDM signal, performs channel estimation on the separated PN head, and performs phase noise estimation and compensation on the separated signal frame body:

[0079] (2) Discrete Fourier transform the signal frame body to obtain the received phase reference transmission signaling, namely TPS;

[0080] (3) compare N TPSs, and select that group of TPSs with maximum phase reference TPS subcarrier therein, send it to the following bandpass filter;

[0081] (4) Use a band-pass filter whose center frequency is located at the phase reference TPS to extract the phase refe...

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Abstract

The method includes procedures: separating received digital signal at receiving end; PN head in use for evaluating channel and TPS in signal frame body in use for evaluating phase noise; obtaining N pieces of TPS in M groups of TPS after carrying out discrete Fourier transform for signal frame body; selecting the TPS with largest amplitude, the selected TPS through extraction of band-pass filter, channel and phase noise interference being as received TPS; multiplying complex conjugate of TPS estimated value passed through channel transmission so as to obtain frequency domain baseband signal of phase noise. Finally, time domain evaluation of phase noise and phase compensation is obtained from discrete Fourier inverse transform. The method is capable of tracking phase transient of received signal at receiving end in time, removing phase noise, recovering system synchronization precisely.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and in particular relates to a method and a system for removing phase noise in a Time Domain Synchronous Orthogonal Frequency Division Multiplexing (TimeDomain Synchronous OFDM, TDS-OFDM) receiver. Background technique [0002] In a digital communication or broadcasting system with synchronous transmission, what is transmitted is the continuous-time waveform s(t, x) corresponding to the sequence x, rather than the sequence itself. The assignment of the channel symbol sequence to the channel waveform is done by the modulator. In addition to the channel sequence x, the waveform also depends on the parameter set θ = (θ T , θ C ). Subset θ T is the transmitter parameter, the subset θ C are channel parameters, which are unknown to the receiver. To recover the symbol sequence x, the receiver must estimate these unknown parameters from the received signal. These estimates...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H04J11/00
Inventor 杨知行杨林
Owner TSINGHUA UNIV