CN100518159C - TDS-OFDM receiver and signal processing method thereof - Google Patents

TDS-OFDM receiver and signal processing method thereof Download PDF

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CN100518159C
CN100518159C CN 200410048297 CN200410048297A CN100518159C CN 100518159 C CN100518159 C CN 100518159C CN 200410048297 CN200410048297 CN 200410048297 CN 200410048297 A CN200410048297 A CN 200410048297A CN 100518159 C CN100518159 C CN 100518159C
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offset
frequency
frequency domain
pilot
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CN1574821A (en
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林赞燮
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三星电子株式会社
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Abstract

一种使用隐藏在频域中的导频信号来能够处理信号的TDS-OFDM接收机及其信号处理方法。 A method of using hidden in frequency domain pilot signal TDS-OFDM signal receiver and a signal processing method to be able to handle. 该多载波接收机包括:傅立叶变换单元,用于将时域信号变换成频域信号;导频检测单元,用于检测隐藏在频域信号中的导频信号;偏移/信道估计单元,用于估计频率偏移、时间偏移和信道状态;偏移补偿单元,用于补偿估计出的频率偏移和时间偏移;和均衡器,用于基于估计出的信道状态来均衡频域信号。 The multicarrier receiver comprising: a Fourier transform unit for transforming time domain signals into frequency domain signals; pilot detection means for detecting a hidden signal in the frequency domain pilot signal; offset / channel estimation unit, with to estimate the frequency offset, time offset, and channel state; offset compensation unit for compensating the estimated frequency offset and time offset; and an equalizer, based on the estimated channel state to the frequency domain equalized signal.

Description

时域同步正交频分复用接收机及其信号处理方法 Time-domain synchronous orthogonal frequency-division multiplexing receiver and signal processing method

技术领域 FIELD

本发明一般地涉及一种数字广播系统,并且特别涉及一种使用在频域中的子裁波中隐藏的导频信号来能够提高接收性能的时域同步正交频分复用 The present invention relates generally to a digital broadcasting system, and particularly relates to a sub-frequency domain in the CD hidden wave pilot signal reception performance can be improved time-domain synchronous orthogonal frequency-division multiplexing

(TDS-OFDM)接收机及其信号处理方法。 (TDS-OFDM) receiver and a signal processing method.

背景技术 Background technique

正交频分复用(OFDM)是多载波调制方法中的一种,其在多径或移动环境中具有良好的性能。 Orthogonal frequency-division multiplexing (OFDM) is a multicarrier modulation method, having a good performance in a multipath environment or movement.

OFDM系统通过使用在栽波之间具有正交性的多载波来提高频率的利用。 OFDM system to improve frequency utilization by using multiple carriers having orthogonality between planted wave. OFDM系统在有线和无线通信中使用多载波,并且适合高数据率的传输。 The system using multi-carrier OFDM in wired and wireless communication, and for transmission of high data rate. 如果在具有多径衰落的无线通信信道中,用单载波系统来传输其码元的持续时间 If the communication channel in a wireless multipath fading, with the single-carrier system to which a transmission symbol duration

是短的高速数据,则加重了码元间千扰,并且显著地增加了接收端的复杂性。 Is a short high-speed data, is one thousand increased inter-symbol interference, and significantly increases the complexity of the receiving end. 当多栽波系统扩大每个子栽波的码元持续时间为子载波的数目时,该系统能够维持数据传输率,并且因此抗多径能力强。 When multiple expansion wave system of each sub-planted planted wave symbol duration is the number of subcarriers, the system can maintain a data transfer rate, and therefore multipath ability.

在OFDM系统中,在载波之间具有正交性的多载波被用来提高频率的利用,并且发射端和接收端分别调制/解调该多载波,这带来了与离散傅立叶逆变换(IDFT)和离散傅立叶变换(DFT)相同的效果。 In an OFDM system, in having the orthogonality between carriers it is used to improve the use of a multi-carrier frequency, and transmitting and receiving ends respectively, a modulation / demodulation of the multicarrier, which brings the inverse discrete Fourier transform (IDFT ) and the same effect as a discrete Fourier transform (DFT). 因此,能够通过使用离散傅立叶逆变换(IDFT)和离散傅立叶变换(DFT)高速地执行调制和解调。 Thus, the modulation and demodulation can be performed by using an Inverse Discrete Fourier Transform (IDFT) and Discrete Fourier Transform (DFT) at high speed.

TDS-OFDM系统将同步信息如伪噪声(PN)序列插入到时域中。 TDS-OFDM system synchronization information such as a pseudo-noise (PN) sequence is inserted into the time domain. 具体地讲,TDS-OFDM系统使用时域中的同步信号来获得时域和频域的同步,并且执行信道均衡。 In particular, synchronizing signal TDS-OFDM system uses a domain to obtain time synchronization and frequency domain, and perform channel equalization. 然而,TDS-OFDM系统具有关于有限的接收系统和性能恶化的缺点。 However, TDS-OFDM systems have the disadvantage of a limited receiving system and on performance degradation.

本申请人已经在韩国专利申请第10-2002-59363号上公开了题目为"具有加入到频域中的导频信号的多载波传输系统及其信号处理方法,Muiti-carrier transmission system having pilot signal added infrequency domain and signal processing method thereof"的专利,其中将导频信号加入到用于传输的时域OFDM信号中。 The present applicant has disclosed entitled "multicarrier transmission system and a signal processing method is added to the frequency domain pilot signal, Muiti-carrier transmission system having pilot signal in the Korean Patent Application No. 10-2002-59363 added infrequency domain and signal processing method thereof "patent, wherein the pilot signal is added to the time domain OFDM signal for transmission.

3图l是显示在韩国专利申请第10-2002-59363号公开的传输系统的方框图。 FIG 3 is a block diagram showing a transmission system l No. 10-2002-59363 disclosed in Korean Patent Application.

如在图1中所示,传输系统包括将导频信号加入到时域OFDM信号中的导频插入单元220。 As shown, the transmission system of FIG. 1 comprises a pilot signal is added to the pilot signal of the time domain OFDM pilot insertion unit 220. 参考图2,导频插入单元220用与I信号和Q信号相同的1个码元时间分别将很低功率的I导频信号Pt和Q导频信号P。 Referring to FIG 2, a pilot inserting unit 220 and the I signal and the same time one symbol of the I Q signals are turned low power pilot signal Pt and Q pilot signal P. 加到I信号和Q信号。 Was added I and Q signals. 用预定数目的I导频信号的功率的积累变成比I信号的平均功率大的方法来设置I导频信号的功率P,。 Accumulation of signal in the frequency power with a predetermined number of average power lead I becomes larger than the method of setting the I-signal I pilot signal power P ,. 可以用与相同的I导频信号的功率的设置方法来设置Q导频信号的功率PQ。 The method can be provided in the same frequency power pilot signal I provided to the power PQ Q pilot signal. 当导频信号Hidden—Pilot P,和P"皮加入到作为OFDM信号的I和Q信号中时,如在图3中所示形成信号。映射数据和导频信号Hidden-Pilot P,和P。被加载到个IDFT点子栽波中的每一个。 When the pilot signal Hidden-Pilot P, and P "is added to the skin as I and Q signals in the OFDM signal, as shown in Figure 3 is formed in the signal data and pilot signals mapped Hidden-Pilot P, and P. a point IDFT is loaded into a wave of each plant.

通过IDFT单元230,具有导频信号Hidden—Pilot P,和P。 By IDFT unit 230, a pilot signal having a Hidden-Pilot P, and P. 的OFDM信号被调制为时域中的0FDM信号。 0FDM an OFDM signal is modulated signal in the time domain. 调制后的时域中的0FDM信号经过保护间隔插入单元240、同步信息插入单元250和整形滤波器单元传输到无线信道环境。 0FDM time domain signal modulated through the guard interval insertion unit 240, the synchronization information inserting unit 250 and transmitted to the wireless channel shaping filter unit environment.

因此,需求接收系统来处理隐藏在频域中的子载波中的导频信号Hidden—Pilot P!和Pq。 Thus, demand for the receiving system to handle hidden subcarriers in the frequency domain pilot signal Hidden-Pilot P! And Pq.

发明内容 SUMMARY

为了满足以上的需求,本发明的目的在于提供一种用于通过使用在频域中的子载波中的隐藏导频信号来获得同步和执行信道均衡的TDS-OFDM接收机及其信号处理方法。 To meet the above demand, an object of the present invention to provide a TDS-OFDM receiver and a signal processing method for using a hidden by the guide subcarriers in the frequency domain pilot signal to obtain synchronization and channel equalization performed.

TDS-OFDM接收机包括:傅立叶变换单元,用于将时域信号变换成频域信号;导频检测单元,用于检测隐藏在频域信号中的导频信号;偏移/信道估计单元,用于估计频率偏移、时间偏移和信道状态;偏移补偿单元,用于补偿估计出的频率偏移和时间偏移;和均衡器,用于基于估计出的信道状态来均衡频域信号。 TDS-OFDM receiver comprising: a Fourier transform unit for transforming time domain signals into frequency domain signals; pilot detection means for detecting a hidden signal in the frequency domain pilot signal; offset / channel estimation unit, with to estimate the frequency offset, time offset, and channel state; offset compensation unit for compensating the estimated frequency offset and time offset; and an equalizer, based on the estimated channel state to the frequency domain equalized signal.

导频检测单元基于频域信号和参考导频信号之间的相关值来检测隐藏的导频信号。 The pilot detecting unit based on a correlation value between the reference signal and the frequency domain pilot signal to the pilot signal detecting concealed. 该隐藏的导频信号是伪噪声(PN)序列。 The hidden pilot signal is a pseudo-noise (PN) sequence.

一种多载波接收机的信号处理方法包括:将时域信号变换成频域信号;检测隐藏在频域信号中的导频信号;估计频率偏移、时间偏移和信道状态;补偿估计出的频率偏移和时间偏移;和基于估计出的信道状态来均衡频域信基于频域信号和参考导频信号之间的相关值来执行检测导频信号。 The signal processing method of a multi-carrier receiver comprising: transforming a time domain signal into a frequency domain signal; detecting hidden signal in the frequency domain pilot signal; estimating a frequency offset, a time offset and channel state; compensate for estimated time offset and a frequency offset; and the channel state is equalized based on the estimated frequency domain channel pilot signal detection is performed based on a correlation value between a frequency domain signal and the reference pilot signal. 因此,通过使用隐藏在频域中的导频信号更高准确度地估计频率偏移、时间偏移和多径,从而与一般的接收机相比提高了接收性能。 Thus, by hiding in the frequency domain using the estimated pilot signal in the frequency with higher accuracy to the frequency offset, time offset, and multipath, thus improving the general reception performance compared to a receiver.

附图说明 BRIEF DESCRIPTION

结合附图阅读下面详细的描述,本发明的上述目的、其他特点和优点将会变得更加清楚,其中: Conjunction with the drawings the following detailed description, the above object of the present invention, other features and advantages will become more apparent, wherein:

图1是显示传统的多载波发射机的方框图; FIG. 1 is a block diagram of the conventional multicarrier transmitter display;

图2是显示在频域中的数据信号和加入的导频信号的示图;图3是显示在频域中的具有导频信号的数据信号的示图;图4是显示根据本发明某实施例的多载波接收机的方框图;图5是显示根据本发明某实施例的多载波接收机的信号处理方法的流程图;和 FIG 2 is a frequency domain data signal and pilot shown in FIG added pilot signal; FIG. 3 is a diagram of a data signal in the pilot signal having the frequency domain; FIG. 4 is an embodiment of the present invention a block diagram of a multicarrier receiver of the embodiment; FIG. 5 is a flowchart of a signal processing method in a multicarrier receiver of the present invention, an embodiment of the display; and

图6是显示根据本发明某实施例的接收到的信号和参考导频信号之间的相关的示图。 FIG 6 is a correlation diagram between the frequency of a received signal in accordance with an embodiment of the present invention and the reference pilot signal.

具体实施方式参考附图来详细说明本发明。 DETAILED DESCRIPTION Referring to the drawings the present invention will be described in detail.

图4是显示多载波接收机中的时域同步正交频分复用(TDS-0FDM)接收机的框图,其使用隐藏在频域中的子载波中的导频信号来处理信号。 FIG 4 is a multicarrier receiver in a block diagram of time-domain synchronous orthogonal frequency division multiplexing (TDS-0FDM) receiver, using hidden pilot signal subcarriers in the frequency domain to process the signal.

TDS-OFDM接收机包括:无线电频率(RF)单元411、偏移补偿单元413、用于可靠性补偿的漂移重发(SRRC)滤波器414、同步信号/保护间隔检测单元415、偏移估计单元417、同步信号/保护间隔移除单元419、傅立叶变换单元421、导频4企测单元431、偏移/信道估计单元433、均衡器435和前向纠错(FEC)单元437。 TDS-OFDM receiver comprising: a radio frequency (RF) unit 411, an offset compensation unit 413, a retransmission drift (SRRC) filter 414 to compensate for the reliability of the synchronization signal / guard interval detection unit 415, an offset estimation unit 417, a synchronization signal / guard interval removal unit 419, a Fourier transform unit 421, a pilot unit 431 measuring 4 half, the offset / channel estimation unit 433, an equalizer 435, and forward error correction (FEC) unit 437.

RF单元411将接收到的信号变换成基带信号。 The RF unit 411 converts the received signal into a baseband signal.

偏移补偿单元413基于估计出的频率偏移和时间偏移来补偿关于接收到的信号的偏移。 Offset compensation unit 413 to compensate for the offset signal based on the received offset and a frequency offset estimated time.

SRRC滤波器414与使用在发射端的滤波器相同,并且对接收到的信号的脉冲整形。 SRRC filter 414 and the transmitting end filter using the same, and the abutment of a received signal pulse shaping.

同步信号/保护间隔检测单元415检测插入的保护间隔(GI),以防止邻近码元和包括在接收到的信号中的作为同步信号的伪噪声(PN)序列之间的干扰。 Interference between adjacent symbols and comprises a pseudo noise in the received signal as a synchronization signal (PN) sequence 415 detect the insertion of a guard interval (GI), in order to prevent the synchronization signal / guard interval detection unit.

偏移估计单元417基于检测出的同步信号来估计频率偏移和时间偏移。 Offset estimation unit 417 based on the detected synchronization signal to estimate the frequency offset and time offset.

同步信号/保护间隔移除单元419移除检测出的同步信号和GI。 Synchronization signal / guard interval removal unit 419 to remove the detected synchronization signal and GI.

傅立叶变换单元421将从其中移除同步信号和GI的接收到的信号傅立叶变换成频域中的信号。 Signal 421 from the received signal and the synchronization signal GI removal Fourier transform into a frequency domain wherein the Fourier transform unit.

导频检测单元431基于在频域中的信号和对接收端是已知的参考导频信号之间的相关性来检测隐藏在子载波中的导频信号P【和P0。 The pilot signal detecting unit 431 based on the frequency domain and the receiving end of the reference pilot is known to detect correlation between the signals hidden pilot signal subcarriers and P [P0.

作为一般导频信号的PN序列的相关性具有如下特性:相同的PN序列之间的相关值具有峰值,并且不同的PN序列之间的相关值是"0"。 The correlation of the PN sequence as a pilot signal generally has the following characteristics: a correlation value between a peak having the same PN sequence, and a correlation value between different PN sequences are "0." 使用PN序列的相关特性,能够检测出隐藏在频域子载波中的导频信号P,和PQ。 Using the correlation characteristics of the PN sequence can be detected hidden in frequency domain subcarrier pilot signal P, of PQ.

偏移/信道估计单元433基于在导频检测单元431检测出的相关性来重新估计频率偏移和时间偏移,并且向偏移补偿单元413提供重新估计出的频率偏移和时间偏移。 Offset / channel estimation unit 433 based on the pilot detection unit 431 detects the correlation of the re-estimated frequency offset and time offset, and provides a re-estimated frequency offset and time offset to the offset compensating unit 413. 该偏移/信道估计单元433还基于相关值来估计信道状态,并且给均衡器435提供信道状态信息。 This offset / channel estimation unit 433 estimates a correlation value further based on a channel state and channel state information provided to the equalizer 435.

均衡器435基于提供的信道状态信息来移除接收到的信号中的多径干扰。 The equalizer 435 to remove multipath interference in the received signal based on the channel state information provided.

FEC单元437通过为均衡后的数据信号设置的错误检测系统来检测错误,并且纠正检测出的错误。 FEC error detecting unit 437 through the system settings to the equalized signal data to detect errors, and to correct the detected error.

图5是显示根据本发明某实施例的TDS-OFDM接收机的信号处理方法的流程图。 5 is a flowchart of a method of processing a signal according to TDS-OFDM receivers according to embodiments of the present invention. 参考图5和图6详细地描述该信号处理方法,其中使用隐藏在频域子载波中的导频信号来提高接收性能。 6 the signal processing method described in detail with reference to FIGS. 5 and 6, wherein the hidden pilot signals in the frequency domain subcarriers to improve reception performance.

偏移单元417使用PN序列来估计频率偏移和时间偏移,该PN序列是在时域中的同步信号并且包括在接收到的信号中。 Offset unit 417 using the PN sequences to estimate the frequency offset and time offset of the PN sequence is time domain and a synchronization signal included in the received signal. 在步骤S51i中,该偏移补偿单元417补偿估计出的频率偏移和时间偏移。 In step S51i, the offset compensating unit 417 to compensate the estimated frequency offset and time offset.

在步骤S513中,傅立叶变换单元421将从其中移除同步信号和GI的接收到的信号傅立叶变换成频域信号。 In step S513, the Fourier transform unit wherein the received signal and synchronization signal removal GI 421 from the Fourier transform into a frequency domain signal.

在步骤S521中,导频检测单元431通过频域信号和参考导频信号之间的相关性来检测隐藏在子载波中的导频信号P,和P0。 In step S521, the pilot detection unit 431 and the frequency domain reference pilot signal correlation detection between the pilot signal subcarrier hidden pilot signal P, of P0.

图6显示了包括在频域中的第一子载波中的导频信号P! Figure 6 shows a pilot signal P includes a first sub-carrier in the frequency domain in! 和P。 And P. 的接收到的信号。 It received signal. 参考图6,第一子载波具有由分别将I导频信号和Q信号加到I和Q信号而产生的信号I+P,和Q+P0。 Referring to FIG 6, a first subcarrier having a pilot signal, respectively, the I and Q signals applied to I and Q signals generated by the signal I + P, and Q + P0. 导频检测单元431获得第一子载波中的信号I+P,和Q+P。 The pilot detecting unit 431 to obtain a first subcarrier signal of I + P, and Q + P. 和参考导频信号 And the reference pilot signal

RP,和RP。 RP, and RP. 之间的相关性。 The correlation between. 参考导频信号RP,和RP。 Reference pilot signal RP, and RP. 是第一子载波中的导频信号。 The first signal is a pilot subcarrier. 如果隐藏在接收到的信号中的导频信号P,和P。 If the received signal hidden in the pilot signal P, of P. 与参考导频信号RP,和RPo相同,则根据PN序列的相关特性该相关值变成峰值。 RP and the reference pilot signal, and RPo same, the correlation value becomes a peak value according to the correlation characteristics of the PN sequence. 如果导频信号P,和PQ与参考导频信号! If the pilot signal P, of the reference pilot signal PQ! U^和RPq不相同,则根据PN序列的相关特性该相关值变成"0"。 U ^ and RPq not the same, according to the relevant characteristics of the PN sequence correlation value becomes "0."

例如,该峰值的存在表示隐藏在第一子载波中的导频信号P!和P。 For example, the presence of the peak indicates the hidden first subcarrier pilot signal P! And P. 与参考导频信号RP,和RPq相同。 And the reference pilot signal RP, and RPq same. 因此,通过从第一子载波中移除参考导频信号RP,和RPq,仅仅保留数据信号I和Q。 Thus, by removing the RP reference pilot signal, and RPq from the first subcarrier, to retain only the data signals I and Q.

如上所述,使用PN序列的相关特性能够检测出隐藏在从第一到N(N表示子载波的数目)子载波中的导频信号Hidden_PUot P!和P0。 As described above, the PN sequence correlation characteristic can be detected to hide from the first N (N denotes the number of subcarriers) subcarrier pilot signal Hidden_PUot P! And P0.

在步骤S523中,偏移/信道估计单元433基于相关值来重新估计频率偏移和时间偏移,并且也估计信道状态。 In step S523, the offset / channel estimation unit 433 based on the correlation values ​​re-estimated frequency offset and time offset, and also estimate the channel state.

如果作为相关值的峰值不存在于第一子载波但来自第二子载波,则偏移/信道估计单元433估计该频率偏移作为相应于第一子载波和第二子载波之间的间隔的频率偏移。 If a peak correlation value does not exist but the first sub-carrier from a second sub-carrier, the offset / channel estimation unit 433 estimates the frequency offset between the first subcarrier spacing and the second subcarrier as the corresponding frequency offset. 偏移/信道估计单元433另外通过相关值的相位分量的改变来估计时间偏移和信道状态。 Offset / channel estimation unit 433 further by changing the phase component of the correlation values ​​to estimate the time offset and channel state.

在步骤S525中,偏移补偿单元413使用重新估计出的频率偏移和时间偏移,以补偿由时域同步信号没有补偿的剩余的频率偏移和时间偏移。 In step S525, the offset compensation unit 413 using the remaining re-estimated frequency offset and time offset, without compensation to compensate for time domain synchronization signal by the offset and time offset.

在步骤S527中,均衡器435均衡从其中移除导频信号的数据信号I和Q。 In step S527, the equalizer 435 equalizing the data signal from which removing pilot signals I and Q. 在步骤S529中,FEC单元437检测和纠正在均衡后的数据信号中的错误。 In step S529, FEC unit 437 detects and corrects errors in the data signal equalization. 因此,使用时域同步信号和频域导频信号来估计频率偏移、时间偏移和信道状态,所以提高了接收性能。 Thus, the time domain synchronization signal, and using the frequency domain pilot signal to estimate a frequency offset, time offset, and a channel state, the reception performance is improved.

根据本发明的某实施例,通过使用隐藏在频域中的导频信号来更高准确度地估计频率偏移、时间偏移和多径,所以与一般的接收机相比提高了接收性能。 According to an embodiment of the present invention, hidden by using the pilot signal in the frequency domain with higher accuracy to estimate the frequency offset, time offset, and multipath, as compared with the general receiver improves reception performance.

尽管显示和描述了本发明的一些实施例,但本领域的技术人员应该理解,在不脱离本发明的原则和精神和由所附权利要求及其等效所限定的范围的情况下,可以在本实施例中做出改变。 Although it is shown and described several embodiments of the present invention, those skilled in the art will appreciate that, without departing from the principles and spirit of the invention and from the appended claims and their equivalents as defined ranges, can be embodiment of the present embodiment to make changes.

7 7

Claims (4)

1、一种通过用傅立叶变换将时域信号变换成为频域信号来处理信号的多载波接收机,其中包括: 傅立叶变换单元,用于将时域信号变换成频域信号; 导频检测单元,用于基于频域信号和参考导频信号之间的相关值来检测隐藏在频域信号中的导频信号; 偏移/信道估计单元,用于估计频率偏移、时间偏移和信道状态; 偏移补偿单元,用于补偿估计出的频率偏移和时间偏移;和均衡器,用于基于估计出的信道状态来均衡频域信号。 1. A time-domain signal into a frequency domain by Fourier transform signal processing multicarrier receiver signal, wherein comprising: a Fourier transform unit for transforming time domain signals into frequency domain signals; pilot detection means, means for detecting hidden in frequency domain signal based on the pilot signal correlation value between a frequency domain signal and the reference pilot signal; offset / channel estimation unit for estimating a frequency offset, a time offset and channel state; offset compensation unit for compensating the estimated frequency offset and time offset; and an equalizer, based on the estimated channel state to the frequency domain equalized signal.
2、 如权利要求1所述的接收机,其中,隐藏的导频信号是伪噪声(PN) 序列。 2. The receiver of claim 1, wherein the pilot signal is hidden pseudo noise (PN) sequence.
3、 一种通过用傅立叶变换将时域信号变换成为频域信号的多载波接收机的信号处理方法,其中包括:将时城信号变换成频域信号;基于频域信号和参考导频信号之间的相关值来检测隐藏在频域信号中的导频信号;估计频率偏移、时间偏移和信道状态; 补偿估计出的频率偏移和时间偏移;和基于估计出的信道状态来均衡频域信号。 3. A time-domain signal by a signal processing method of a multi-carrier receiver frequency domain signal by Fourier transform, which comprises: when the city-domain signal into a frequency signal; and a frequency domain signal based on the reference pilot signal to detect the correlation value between signals hidden in the frequency domain pilot signal; estimating a frequency offset, a time offset and channel state; frequency offset compensation and time offset estimated; and based on the estimated channel state to equalize frequency domain signal.
4、 如权利要求3所述的方法,其中,隐藏的导频信号是伪噪声(PN) 序列。 4. The method as claimed in claim 3, wherein the pilot signal is hidden pseudo noise (PN) sequence.
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