CN1574815A - Multicarrier receiver and signal processing method thereof - Google Patents

Multicarrier receiver and signal processing method thereof Download PDF

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Publication number
CN1574815A
CN1574815A CNA2004100462666A CN200410046266A CN1574815A CN 1574815 A CN1574815 A CN 1574815A CN A2004100462666 A CNA2004100462666 A CN A2004100462666A CN 200410046266 A CN200410046266 A CN 200410046266A CN 1574815 A CN1574815 A CN 1574815A
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China
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signal
frequency
time domain
code element
shift
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CNA2004100462666A
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Chinese (zh)
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金俊守
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/01—Equalisers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2649—Demodulators
    • H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2669—Details of algorithms characterised by the domain of operation
    • H04L27/2671—Time domain

Abstract

The invention relates to a multi-carrier receiver and a signal processing method. The multi-carrier receiver comprises: ADC which is used to sample the received analog signal to transfer to digital signal; a timing migration compensation device which is used to estimate and compensate the timing migration of the code elements in the time domain; a frequency migration compensation device which is used to estimate and compensate the frequency migration of the signal in the time domain; a weighing apparatus which is used to estimate and remove the multipath of the signal by using the synchronous signal in the time domain; and a fourier transformation unit which is used to transfer the signal in the time domain to the signal in the frequency domain. So execution of the synchronization can recover the frequency migration and the timing migration of the code element in the time domain, and the multipath interference is removed by the equilibrium of the PN sequence.

Description

Multi-carrier receiver and signal processing method thereof
Technical field
The present invention relates generally to a kind of digital broadcasting transmitter.Specifically, the present invention relates to a kind of and corresponding receiver and the signal processing method thereof of multicarrier transmitter that adds and send the synchronizing signal in the time domain.
Background technology
Time-domain synchronization OFDM (TDS-OFDM) transmitter uses the signal with structure shown in Fig. 1.Protection at interval (GI) is added to before the ofdm signal in the time domain of inverse fourier transform, in case disturb between stop element.Pseudo noise (PN) sequence, this sequence is a synchronizing signal, is added to before the GI.
Say that generally the OFDM receiver carries out Fourier transform reverting to the OFDM code element of frequency domain with the OFDM code element of time domain, and the pilot frequency information that is contained in by use in the OFDM code element of the recovery in the frequency domain carries out synchronization acquistion and channel estimating.
As shown in Figure 1, different with the general ofdm signal of the pilot signal with frequency domain, the signal that sends by the TDS-OFDM system comprises the PN sequence in the time domain.Therefore, if the PN sequence in the time domain is used for synchronization acquistion and channel estimating, then synchronization acquistion and channel estimating can be finished before Fourier transform.That is to say, carry out synchronization acquistion and channel estimating quickly in case the time delay in the stop signal processing.
Summary of the invention
An aspect of of the present present invention is to address the above problem at least and/or shortcoming also provides following advantage at least.Therefore, an aspect of of the present present invention is to provide a kind of synchronizing signal of time domain of can using to carry out synchronous and balanced multi-carrier receiver and signal processing method thereof.
Multi-carrier receiver comprises: analog-digital converter (ADC), and the analog signal that receives of being used to sample is to be converted to digital signal; The timing slip compensating unit is used for estimating and compensates code element timing shift about the time domain signal; The frequency offset compensation unit is used for estimating and compensates frequency shift (FS) about the signal of time domain; Equalizer is used for by the synchronizing signal estimation of using time domain and the multipath of removing signal; And Fourier transformation unit, be used for signal transformation with time domain and be the signal in the frequency domain.
Multi-carrier receiver also comprises synchronous detection unit, is used to detect the positional information of synchronizing signal.The positional information of the synchronizing signal that detects at synchronous detection unit is offered one of frequency offset compensation unit, equalizer and Fourier transformation unit at least.
The timing slip compensating unit comprises: the timing slip estimation unit is used for estimating the code element timing shift that produces in sampling process; And interpolation device, be used for based on the code element timing shift compensation code element timing shift of estimating.
The frequency offset compensation unit comprises: the Frequency offset estimation unit is used for by using the synchronizing signal estimated frequency skew of time domain; And frequency compensation unit, be used for being offset based on the estimated frequency shift compensating frequency.
The signal processing method of multi-carrier receiver comprises: switch process, and the analog signal that receives and be converted to digital signal is used to sample; The timing slip compensation process is used for estimating and compensates code element timing shift about the signal of time domain; The frequency offset compensation step is used for estimating and compensates frequency shift (FS) about the signal of time domain; Equalization step is used for by the synchronizing signal estimation of using time domain and the multipath of removing signal; With the Fourier transform step, be used for signal transformation with time domain and be the signal in the frequency domain.
This method also comprises the synchronous detecting step of the positional information that is used to detect synchronizing signal.The positional information of detected synchronizing signal is offered one of frequency shift (FS) step, equalization step and Fourier transform step at least.
The timing slip compensation process comprises the steps: to estimate the code element timing shift that produces in sampling process; With code element timing shift compensation code element timing shift based on estimation.
Therefore, carry out synchronously carrying out equilibrium to remove the multipath interference by using the PN sequence to recover frequency shift (FS) and the code element timing shift in the time domain.As a result, can carry out synchronous and balanced quickly than general multi-carrier receiver.
Description of drawings
In conjunction with the drawings the embodiment of the invention is described in detail, above-mentioned aspect of the present invention and other characteristics will become apparent, wherein:
Fig. 1 represents is the structure of general TDS-OFDM signal;
Fig. 2 is the block diagram of the multi-carrier receiver of the expression embodiment of the invention;
Fig. 3 A to 3C is the diagrammatic sketch of the frequency spectrum of the signal handled in the multi-carrier receiver that is illustrated among Fig. 2;
Fig. 4 is the block diagram of the multi-carrier receiver of the expression embodiment of the invention;
Fig. 5 is the flow chart of signal processing method of the multi-carrier receiver of the expression embodiment of the invention.
Embodiment
Describe embodiments of the invention with reference to the accompanying drawings in detail, its example is enumerated in the accompanying drawings, and wherein identical label is represented identical parts all the time.Describing embodiment below in conjunction with accompanying drawing is in order to explain the present invention.
Fig. 2 represents the block diagram of time-domain synchronization OFDM (TDS-OFDM) receiver according to an embodiment of the invention.The TDS-OFDM receiver has the digital processing element 200 of the analog processing unit 100 and the processing digital signal of Analog signals.
Analog processing unit 100 comprises tuner 111, surface acoustic wave (SAW) filter 113, intermediate frequency (IF) amplifier 115, analog-digital converter (ADC) 117 and automatic gain control (AGC) unit 119.
Tuner 111 is selected efficient channel in radio frequency (RF) signal by the antenna input.Tuner 111 is selected the channel corresponding with user's selection and will be output as the IF signal as the RF signal of the channel input of selecting.The IF signal has the centre frequency scope from 30MHz to 50MHz.
SAW filter 113 with center frequency signal filtering near channel width, for example, near 6MHz or 8MHz.In filtering, removed the image component that produces in the interference of adjacent channel and the frequency conversion in tuner 111.
IF amplifier 115 is provided based on the difference power that is provided by AGC unit 119 by the gain of center frequency signal.
ADC117 is digital signal by sampling, quantification and coding with the analog signal conversion that receives.
Thereby AGC unit 119 calculates at the power of the digital signal of ADC 117 conversions and the signal of the regular level of output work rate variance output device.
As mentioned above, analog processing unit 100 is a digital signal with the analog that receives.Digital signal has real component as shown in Figure 3A.
Digital processing element 200 comprises separation/mobile unit 211, low pass filter (LPF) 213, interpolation device 215, frequency compensation unit 217, square root raised cosine (SRRC) filter 219, timing slip estimation unit 221, Frequency offset estimation unit 223, synchronous detection unit 225, equalizer 227, Fourier transformation unit 229 and forward error correction (FEC) unit 231.
Because the signal of sampling only has real component as shown in Figure 3A, separation/mobile unit 211 is converted to complex signal by sampled signal being multiplied by a complex signal with real signal.Real signal to the conversion of complex signal basically corresponding to frequency shift (FS).Especially, the frequency spectrum of the real signal as shown in Fig. 3 A is moved to the base band as shown in Fig. 3 B.
LPF 213 removes the image component of high-frequency domain from the signal that moves on to base band, shown in Fig. 3 C.
Interpolation device 215 uses the timing slip of estimating at timing slip estimation unit 221 to compensate code element timing shift by interpolation.
Frequency compensation unit 217 is offset with digital controlled oscillator (NCO) value compensating frequency by the signal CM that will receive, and this digital controlled oscillator value is corresponding to frequency shift (FS) that is provided by Frequency offset estimation unit 223 and phase deviation.
SRRC filter 219, promptly matched filter makes the signal to noise ratio maximization not produce inter symbol interference (ISI) by matched signal.
Timing slip estimation unit 221 calculates the information of the timing error that produces in the sampling process in ADC 117, and information is offered interpolation device 215.
Pseudo noise (PN) sequencal estimation frequency shift (FS) and phase deviation that Frequency offset estimation unit 223 uses as synchronizing signal.Frequency offset estimation unit 223 is converted to estimated frequency shift and phase deviation phase value and the output nco value corresponding to the phase value of conversion at last.
Synchronous detection unit 225 detects the accurate position that is positioned at OFDM code element PN sequence before.The position of detected PN sequence is provided for Frequency offset estimation unit 223, equalizer 227 and Fourier transformation unit 229.Frequency offset estimation unit 223 comes the estimated frequency skew by the correlation of PN sequence.The signal of the training mode that equalizer 227 use PN sequence equilibriums receive.Fourier transformation unit 229 uses the positional information of PN sequence only the OFDM code element to be carried out Fourier transform selectively.
Equalizer 227 uses PN sequencal estimation multipath, thus and the multipath interference of removing the signal that receives.
Fourier transformation unit 229 is transformed to frequency-region signal with the time-domain signal of handling.
FEC unit 231 is according to the mistake in the frequency-region signal of predetermined error-detecting method detection and correction conversion.
The TDS-OFDM receiver of one embodiment of the invention was undertaken by estimating frequency shift (FS) and timing slip in the time domain before Fourier transform synchronously.The TDS-OFDM receiver also uses synchronizing signal to estimate multipath and the interference of removing the multipath of estimating.As a result, compare, in the shorter time, carry out synchronous and balanced with general multipath receiver.
Fig. 4 is the block diagram of the TDS-OFDM receiver of another embodiment of the present invention.As shown in Figure 4, therefore identical among analog processing unit 100 and first embodiment omitted the detailed description to analog processing unit 100 for the sake of simplicity.The digital processing element 400 of another embodiment of the present invention comprises: frequency compensation unit 411, low pass filter (LPF) 413, interpolation device 415, SRRC filter 417, timing slip estimation unit 419, Frequency offset estimation unit 421, synchronous detection unit 423, equalizer 425, Fourier transformation unit 427 and FEC unit 429.
Frequency compensation unit 411 is offset with the nco value compensating frequency by the signal CM that will receive, and this nco value is corresponding to frequency shift (FS) that is provided by Frequency offset estimation unit 421 and phase deviation.Frequency offset estimation unit 421 is provided for that sampled signal moved on to the deviation frequency of base band and corresponding to the nco value of estimated frequency shift.Therefore, frequency compensation unit 411 is by moving on to base band with the sampled signal that receives with the sampled signal that receives with deviation frequency and nco value CM, and the compensating frequency skew.
LPF 413 removes the image component of high-frequency domain, and this image component results from the sampled signal that is moved to base band.
Interpolation device 415 uses the code element timing shift of estimating at timing slip estimation unit 419 to compensate code element timing shift by interpolation.If interpolation device 415 has been designed to the function of LPF, then LPF 413 can omit.
SRRC filter 417, promptly matched filter maximizes signal to noise ratio not produce ISI by matched signal.
Timing slip estimation unit 419 is estimated the code element timing shift that produces in sampling process, and the code element timing shift of estimating is offered interpolation device 415.
Frequency offset estimation unit 421 uses PN sequencal estimation frequency shift (FS) and phase deviation.Frequency offset estimation unit 421 is converted to phase value with estimated frequency shift and phase deviation at last, and output is corresponding to the nco value of the phase value of conversion.Frequency offset estimation unit 421 will be offset distance of swimming frequency (shiftingrunning frequency) be arranged to separating in one embodiment/mobile unit 211 in sampled signal is moved on to base band as many.Therefore, frequency compensation unit 411 is based on the deviation frequency skew of the deviation frequency compensate for estimated that is provided with.
Synchronous detection unit 423 detects the accurate position that is positioned at OFDM code element PN sequence before.The position of detected PN sequence is provided for Frequency offset estimation unit 421, equalizer 425 and Fourier transformation unit 427.
Equalizer 425 uses PN sequencal estimation multipath, and removes the multipath interference of the signal that receives.
Fourier transformation unit 427 is the signal of frequency domain with the conversion of signals of the time domain of processing.
FEC unit 429 is according to the mistake in the frequency-region signal of predetermined error-detecting method detection and correction conversion.
Frequency offset estimation unit 421, rather than the separation/mobile unit among first embodiment 211 are provided for sampled signal is moved on to the deviation frequency of base band.Therefore, frequency compensation unit 411 is based on the frequency compensation estimated frequency shift that is provided with.
Fig. 5 is the flow chart of Signal Processing method of the TDS-OFDM of expression one embodiment of the invention.With reference to Fig. 2 and 5, signal processing method will be described below.
The channel frequency scope of general analog broadcast signal to hundreds of MHz, comprises very high frequency(VHF) (VHF) band and hyperfrequency (UHF) band from tens MHz.Because digital broadcast signal also uses the channel of analog broadcast signal, at step S511, the signal that receives by antenna is switched to IF in tuner 111.
At step S513, SAW filter 113 arrives the IF signal filtering of conversion near the bandwidth of channel, and removes the interference of adjacent channel and the image component that produces in frequency conversion.
The power and the rated output error of the signal of sampling in ADC 117 measured in AGC unit 119, and IF amplifier 115 is adjusted the gain of IF signal based on power error.
At step S515, ADC 117 is by sampling, quantification and the code conversion IF signal from 115 outputs of IF amplifier.
At step S521, the sampled signal that separation/mobile unit 211 will only have real part is converted to complex signal, and complex signal is moved on to base band.At step S523, remove image component, this image component results from by LPF 213 and moves on in the high-frequency domain of signal of base band.
At step S525, SRRC filter 219 with Signal Matching filtering to prevent ISI.
At step S527, interpolation device 215 is based on the code element timing shift compensation code element timing shift of estimating in timing slip estimation unit 221.
At step S529, frequency compensation unit 217 is used frequency shift (FS) and the skew of phase deviation compensating frequency of using the PN sequencal estimation in Frequency offset estimation unit 223.Specifically, Frequency offset estimation unit 223 is based on skew of accurate location information estimated frequency and phase deviation in synchronous detection unit 225 detected PN sequences.
At step S531, equalizer 227 uses the PN sequence of the ofdm signal that receives to estimate multipath based on the positional information of PN sequence, thereby and removes because the multipath that channel circumstance causes disturbs.
At step S533, Fourier transformation unit 229 is carried out Fourier transform based on the positional information of PN sequence to the interval corresponding to the user data of ofdm signal.
At step S535, FEC unit 231 detects and error recovery by predetermined error-detecting method for the OFDM code element of the frequency domain of Fourier transform.
As mentioned above, the TDS-OFDM receiver carries out synchronous with frequency shift (FS) and code element timing shift in the recovery time domain, and uses the PN sequence to carry out equilibrium and disturb to remove multipath.
According to embodiments of the invention, the TDS-OFDM receiver have to the multipath that in wireless channel environment, produces have stronger resistivity multicarrier system advantage and can carry out the advantage of synchronous and balanced fast single-carrier system.Therefore, the TDS-OFDM receiver has obtained the performance improved, thus with general multi-carrier receiver mutually specific energy carry out synchronously and balanced quickly.
Although described various embodiments of the present invention, in a single day those skilled in the art just can carry out other change and modification to embodiment having understood basic inventive concept.Therefore, appended claim should comprise the foregoing description and all changes and the modification that fall into the spirit and scope of the present invention.

Claims (8)

1, a kind of multi-carrier receiver comprises:
Analog-digital converter (ADC), the analog signal that receives of being used to sample is to be converted to digital signal;
The timing slip compensation arrangement is used for estimating and compensates code element timing shift about the signal of time domain;
Frequency deviation compensating device is used for estimating and compensates frequency shift (FS) about the signal of time domain;
Equalizer is used for by the synchronizing signal estimation of using time domain and the multipath of removing signal;
Fourier transformation unit is used for signal transformation with time domain and is the signal in the frequency domain.
2, receiver as claimed in claim 1 also comprises synchronous detection unit, is used to detect the positional information of synchronizing signal,
Wherein, the positional information in the detected synchronizing signal of synchronous detection unit is offered one of frequency deviation compensating device, equalizer and Fourier transformation unit at least.
3, receiver as claimed in claim 1, wherein, the timing slip compensation arrangement comprises:
The timing slip estimation unit is used for estimating the code element timing shift that produces in sampling process; With
Interpolation device is used for based on the code element timing shift compensation code element timing shift of estimating.
4, receiver as claimed in claim 1, wherein, frequency deviation compensating device comprises:
The Frequency offset estimation unit is used for by using the synchronizing signal estimated frequency skew of time domain; With
Frequency compensation unit is used for being offset based on the estimated frequency shift compensating frequency.
5, a kind of signal processing method of multi-carrier receiver comprises:
Switch process, the analog signal that receives and be converted to digital signal is used to sample;
The timing slip compensation process is used for estimating and compensates code element timing shift about the signal of time domain;
The frequency offset compensation step is used for estimating and compensates frequency shift (FS) about the signal of time domain;
Equalization step is used for by the synchronizing signal estimation of using time domain and the multipath of removing signal; With
The Fourier transform step is used for signal transformation with time domain and is the signal in the frequency domain.
6, method as claimed in claim 5 also comprises the synchronous detecting step, is used to detect the positional information of synchronizing signal,
Wherein, the positional information of detected synchronizing signal is offered one of frequency offset compensation step, equalization step and Fourier transform step at least.
7, method as claimed in claim 5, wherein, the timing slip compensation process comprises the steps:
The code element timing shift that estimation produces in sampling process; With
Based on the code element timing shift compensation code element timing shift of estimating.
8, method as claimed in claim 5, wherein, the frequency offset compensation step comprises the steps:
By using the synchronizing signal estimated frequency skew in the time domain; With
Be offset based on the estimated frequency shift compensating frequency.
CNA2004100462666A 2003-06-11 2004-06-08 Multicarrier receiver and signal processing method thereof Pending CN1574815A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101079866B (en) * 2006-01-30 2010-09-29 索尼株式会社 OFDM demodulator, receiver and method
CN101340409B (en) * 2008-08-20 2012-08-22 中国电子科技集团公司第五十四研究所 Frequency domain equalizer based on sub-band splitting
CN101506667B (en) * 2006-08-25 2012-11-14 特克特朗尼克公司 Improved interpolation of complex signal
FR2984581A1 (en) * 2011-12-16 2013-06-21 Sagemcom Broadband Sas Method for measuring e.g. harmonic distortion caused by digital audio apparatus e.g. multimedia tablet, involves deducing reconstituted measurement data, and comparing reconstituted and original measurement data to calculate distortion
CN109923827A (en) * 2016-11-14 2019-06-21 高通股份有限公司 The synchronous transmission of signal technology reduced for peak-to-average power ratio
US10382244B2 (en) 2017-02-14 2019-08-13 Samsung Electronics Co., Ltd. System and method for providing time offset and frequency offset estimation for vehicle to everything communication system

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KR100662418B1 (en) * 2005-08-26 2007-01-02 엘지전자 주식회사 Apparatus for receiving orthogonal frequency division multiplexed signals
KR100747543B1 (en) * 2006-03-14 2007-08-08 엘지전자 주식회사 Apparatus for demodulating broadcasting signal

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101079866B (en) * 2006-01-30 2010-09-29 索尼株式会社 OFDM demodulator, receiver and method
CN101506667B (en) * 2006-08-25 2012-11-14 特克特朗尼克公司 Improved interpolation of complex signal
CN101340409B (en) * 2008-08-20 2012-08-22 中国电子科技集团公司第五十四研究所 Frequency domain equalizer based on sub-band splitting
FR2984581A1 (en) * 2011-12-16 2013-06-21 Sagemcom Broadband Sas Method for measuring e.g. harmonic distortion caused by digital audio apparatus e.g. multimedia tablet, involves deducing reconstituted measurement data, and comparing reconstituted and original measurement data to calculate distortion
CN109923827A (en) * 2016-11-14 2019-06-21 高通股份有限公司 The synchronous transmission of signal technology reduced for peak-to-average power ratio
CN109923827B (en) * 2016-11-14 2022-05-27 高通股份有限公司 Synchronization signal transmission techniques for peak-to-average power ratio reduction
US10382244B2 (en) 2017-02-14 2019-08-13 Samsung Electronics Co., Ltd. System and method for providing time offset and frequency offset estimation for vehicle to everything communication system
US10785079B2 (en) 2017-02-14 2020-09-22 Samsung Electronics Co., Ltd System and method for providing time offset and frequency offset estimation for vehicle to everything communication system

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