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

Multicarrier receiver and signal processing method thereof Download PDF

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CN1574815A
CN1574815A CN 200410046266 CN200410046266A CN1574815A CN 1574815 A CN1574815 A CN 1574815A CN 200410046266 CN200410046266 CN 200410046266 CN 200410046266 A CN200410046266 A CN 200410046266A CN 1574815 A CN1574815 A CN 1574815A
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signal
frequency
estimating
offset
frequency offset
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金俊守
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三星电子株式会社
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Abstract

一种多载波接收机及其信号处理方法。 A multi-carrier receiver and a signal processing method. 该多载波接收机包括:ADC,用于采样接收到的模拟信号并转换为数字信号;定时偏移补偿装置,用于估计和补偿关于时域中的信号的码元定时偏移;频率偏移补偿装置,用于估计和补偿关于时域中信号的频率偏移;均衡器,用于通过使用时域中的同步信号估计和去除信号的多径;和傅立叶变换单元,用于将时域中的信号变换为频域中的信号。 The multicarrier receiver comprising: ADC, for sampling an analog signal received and converted into a digital signal; timing offset compensation means for estimating and compensating a signal on the time domain code symbol timing offset; offset frequency compensating means for estimating and compensating the frequency domain signals on the time offset; an equalizer for estimating the multipath signal and the synchronizing signal is removed by using domain; and a Fourier transform unit for converting the time domain the signal is transformed into the frequency domain. 因此,执行同步以恢复时域中的码元的频率偏移和定时偏移,通过使用PN序列进行均衡以去除多径干扰。 Thus, synchronization is performed at a frequency domain symbol offset and a timing offset recovery, by equalizing the PN sequence is used to remove multipath interference.

Description

多载波接收机及其信号处理方法 Multicarrier receiver and signal processing method

技术领域 FIELD

本发明一般涉及一种数字广播接收机。 The present invention relates generally to a digital broadcast receiver. 具体地说,本发明涉及一种与添加并发送时域中的同步信号的多载波发送机对应的接收机及其信号处理方法。 More specifically, the present invention relates to a receiver and a signal processing method of adding the sync signal and transmitting the time domain multicarrier transmitter corresponds.

背景技术 Background technique

时域同步正交频分复用(TDS-OFDM)发送机使用具有图1中所示结构的信号。 Time-domain synchronous orthogonal frequency-division multiplexing (TDS-OFDM) transmitter using a signal having the structure shown in FIG. 1. 保护间隔(GI)被添加在经傅立叶逆变换的时域中的OFDM信号之前,以防止码元间干扰。 Guard interval (GI) is added before the OFDM signal in the time domain by inverse Fourier transform, in order to prevent inter-symbol interference. 伪噪声(PN)序列,该序列是同步信号,被添加在GI之前。 Pseudo noise (PN) sequence, which is a synchronization signal, is added before the GI.

一般讲,OFDM接收机将时域的OFDM码元进行傅立叶变换以恢复为频域的OFDM码元,并通过使用包含于频域中的恢复的OFDM码元中的导频信息进行同步捕获和信道估计。 In general, OFDM receiver OFDM symbol in the time domain to Fourier transform to recover the OFDM symbols in the frequency domain, and by using the pilot information included in the recovered OFDM symbol in the frequency domain and performs synchronization acquisition channel estimate.

如图1所示,与具有频域的导频信号的一般OFDM信号不同,通过TDS-OFDM系统发送的信号包括时域中的PN序列。 1, a general OFDM frequency domain signal having a pilot signal different from the signal transmitted by the TDS-OFDM system includes a time domain PN sequences. 因此,如果时域中的PN序列用于同步捕获和信道估计,则同步捕获和信道估计可在傅立叶变换之前完成。 Thus, if the PN sequence in time domain for synchronization acquisition and channel estimation, synchronization acquisition and channel estimation can be done prior to Fourier transformation. 也就是说,更快地进行同步捕获和信道估计以防止信号处理中的时延。 That is faster synchronization acquisition and channel estimation process to prevent signal delay.

发明内容 SUMMARY

本发明的一方面在于至少解决上述问题和/或缺点并至少提供下述优点。 In one aspect of the present invention to at least solve the above problems and / or disadvantages and to provide at least the advantages described below. 因此,本发明的一方面在于提供一种能够使用时域的同步信号进行同步和均衡的多载波接收机及其信号处理方法。 Accordingly, an aspect of the present invention is to provide a multi-carrier receiver and a signal processing method of synchronization and equalization in the time domain using the synchronization signal.

多载波接收机包括:模-数转换器(ADC),用于采样接收到的模拟信号以转换为数字信号;定时偏移补偿单元,用于估计和补偿关于时域中信号的码元定时偏移;频率偏移补偿单元,用于估计和补偿关于时域中的信号的频率偏移;均衡器,用于通过使用时域中的同步信号估计和去除信号的多径;和傅立叶变换单元,用于将时域中的信号变换为频域中的信号。 Multicarrier receiver comprising: an analog - digital converter (the ADC) for sampling an analog signal to be converted to received digital signal; timing offset compensation unit for estimating and compensating a signal on the time domain code symbol timing partial shift; frequency offset compensation means for estimating and compensating a signal on a frequency offset in the time domain; an equalizer for a time domain by using a synchronization signal estimate and remove multipath signals; and a Fourier transform unit, It means for converting time domain signals to frequency domain signals.

多载波接收机还包括同步检测单元,用于检测同步信号的位置信息。 Multicarrier receiver further includes a synchronization detection unit for detecting the position information of the synchronization signal. 在同步检测单元检测的同步信号的位置信息被至少提供给频率偏移补偿单元、均衡器、和傅立叶变换单元之一。 The synchronization information is provided in the position detecting unit detects the synchronization signal to at least one of a frequency offset compensation unit, an equalizer, and a Fourier transform unit.

定时偏移补偿单元包括:定时偏移估计单元,用于估计在采样过程中产生的码元定时偏移;和插值器,用于基于估计的码元定时偏移补偿码元定时偏移。 Timing offset compensation unit comprises: a timing offset estimation unit for estimating the symbols generated during the sampling timing offset; and interpolator, based on the estimated symbol timing offset compensation symbol timing offset.

频率偏移补偿单元包括:频率偏移估计单元,用于通过使用时域中的同步信号估计频率偏移;和频率补偿单元,用于基于估计的频率偏移补偿频率偏移。 Frequency offset compensation means comprises: a frequency offset estimation unit for estimating a synchronization signal by using the frequency offset in the time domain; and a frequency compensation unit for compensating the frequency offset based on the frequency offset estimate.

多载波接收机的信号处理方法包括:转换步骤,用于采样接收到的模拟信号并转换为数字信号;定时偏移补偿步骤,用于估计和补偿关于时域中的信号的码元定时偏移;频率偏移补偿步骤,用于估计和补偿关于时域中的信号的频率偏移;均衡步骤,用于通过使用时域中的同步信号估计和去除信号的多径;和傅立叶变换步骤,用于将时域中的信号变换为频域中的信号。 The signal processing method of the multicarrier receiver comprising: a conversion step of sampling the analog signal and converts the received digital signal; timing offset compensation step, for estimating and compensating a signal on the time domain code symbol timing offset ; multipath equalization step, for estimating a synchronization signal and the signal is removed by using in the domain;; frequency offset compensation step, for estimating and compensating a signal on a frequency offset in the time domain and the Fourier transform step, by converting the signal to a time domain signal in the frequency domain.

该方法还包括用于检测同步信号的位置信息的同步检测步骤。 The synchronization detection method further comprising the step of detecting position information of a synchronization signal. 检测到的同步信号的位置信息被至少提供给频率偏移步骤、均衡步骤、和傅立叶变换步骤之一。 Position information detected synchronization signal is supplied to a frequency offset at least a step, equalization step and one step of Fourier transform.

定时偏移补偿步骤包括下述步骤:估计在采样过程中产生的码元定时偏移;和基于估计的码元定时偏移补偿码元定时偏移。 Timing offset compensation step comprises the steps of: estimating symbols generated during the sampling timing offset; and based on the estimated symbol timing offset compensation symbol timing offset.

因此,进行同步以恢复时域中的频率偏移和码元定时偏移,通过使用PN序列进行均衡以去除多径干扰。 Accordingly, the frequency offset to synchronize the time domain recovery and symbol timing offset, by equalizing the PN sequence is used to remove multipath interference. 结果,可以比一般的多载波接收机更快地进行同步和均衡。 As a result, synchronization and equalization can be performed than the average multicarrier receiver faster.

附图说明 BRIEF DESCRIPTION

通过结合附图对本发明实施例进行详细描述,本发明的上述方面和其他特点将会变得更加清楚,其中:图1表示的是一般的TDS-OFDM信号的结构;图2是表示本发明实施例的多载波接收机的框图;图3A至3C是表示在图2中的多载波接收机中处理的信号的频谱的示图;图4是表示本发明实施例的多载波接收机的框图;图5是表示本发明实施例的多载波接收机的信号处理方法的流程图。 By detailed description in conjunction with the accompanying drawings embodiments of the invention, the above-mentioned aspects and other features of the invention will become more apparent, wherein: Figure 1 shows the structure of a general TDS-OFDM signal; FIG. 2 shows a embodiment of the present invention a block diagram of a multicarrier receiver of the embodiment; FIGS. 3A to 3C are diagrams showing the spectrum of the signal processing in the multicarrier receiver of FIG. 2; FIG. 4 is a block diagram of a multicarrier receiver of the embodiment of the present invention represented embodiment; FIG 5 is a flowchart illustrating a signal processing method for a multi-carrier receiver according to an embodiment of the present invention.

具体实施方式 Detailed ways

将参照附图来详细说明本发明的实施例,其例子列举在附图中,其中相同的标号始终表示相同的部件。 Will be described in detail with reference to the accompanying drawings embodiments of the invention, examples of which are listed in the accompanying drawings, wherein like reference numerals refer to like parts. 下面结合附图描述实施例是为了解释本发明。 Example embodiments are described below in conjunction with the accompanying drawings in order to explain the present invention.

图2是表示根据本发明一实施例的时域同步正交频分复用(TDS-OFDM)接收机的框图。 FIG. 2 is a time-domain synchronous orthogonal to an embodiment of the present invention is a block diagram of the receiver frequency division multiplexing (TDS-OFDM). TDS-OFDM接收机具有处理模拟信号的模拟处理单元100、和处理数字信号的数字处理单元200。 The digital processing unit 100, and digital signal processing an analog processing unit having a TDS-OFDM receiver 200 processing an analog signal.

模拟处理单元100包括调谐器111、表面声波(SAW)滤波器113、中频(IF)放大器115、模-数转换器(ADC)117、和自动增益控制(AGC)单元119。 Simulation 111 includes a processing unit 100, a surface acoustic wave (SAW) filter 113, an intermediate frequency (IF) amplifier 115, an analog tuner - digital converter (ADC) 117, and automatic gain control (AGC) unit 119.

调谐器111在通过天线输入的射频(RF)信号中选择有效信道。 The tuner 111 selects an effective channel through an antenna in a radio frequency input (RF) signal. 调谐器111选择与用户的选择对应的信道并将作为选择的信道输入的RF信号输出为IF信号。 111 the user selects the tuner selects a corresponding channel and outputs the selected RF channel signal input as the IF signal. IF信号具有从30MHz至50MHz的中心频率范围。 From IF signal having a center frequency range of 30MHz to 50MHz.

SAW滤波器113将中心频率信号滤波到信道带宽附近,例如,到6MHz或8MHz的附近。 SAW filter 113 filters the signal to a center frequency near the channel bandwidth, for example, near to the 8MHz or 6MHz. 在滤波过程中,去除了邻近信道的干扰和在调谐器111中的频率转换过程中产生的镜像分量。 During the filtering process, removing the adjacent channel interference and a frequency converter in the tuner 111 generated during image components.

IF放大器115基于由AGC单元119提供的功率差来调整中心频率信号的增益。 IF amplifier 115 adjusts the gain based on the power of the center frequency of the signal provided by the difference in the AGC unit 119.

ADC117通过采样、量化、和编码将接收到的模拟信号转换为数字信号。 ADC117 through sampling, quantizing, and encoding the received analog signal is converted into a digital signal.

AGC单元119计算在ADC 117转换的数字信号的功率并输出功率差从而输出具有规则电平的信号。 AGC unit 119 calculates the power of the ADC 117 converts the digital signal and outputs a power difference signal to output a regular level.

如上所述,模拟处理单元100将接收到的模拟信号处理为数字信号。 As described above, the analog processing unit 100 to process the received analog signal into a digital signal. 数字信号具有如图3A所示的实分量。 A digital signal having a real component shown in FIG. 3A.

数字处理单元200包括分离/移动单元211、低通滤波器(LPF)213、插值器215、频率补偿单元217、平方根升余弦(SRRC)滤波器219、定时偏移估计单元221、频率偏移估计单元223、同步检测单元225、均衡器227、傅立叶变换单元229、和前向纠错(FEC)单元231。 The digital processing unit 200 includes a separation / mobile unit 211, a low pass filter (LPF) 213, interpolator 215, a frequency compensation unit 217, a square root raised cosine (SRRC) filter 219, a timing offset estimation unit 221, a frequency offset estimation unit 223, a synchronization detection unit 225, an equalizer 227, a Fourier transform unit 229, and forward error correction (FEC) unit 231.

因为采样的信号只具有如图3A所示的实分量,分离/移动单元211通过将采样信号乘上一个复信号将实信号转换为复信号。 Since only signal samples having a real component shown in FIG. 3A, the separation / mobile unit 211 by the sampling signals by converting a complex signal to a real signal to a complex signal. 实信号至复信号的转换基本上相应于频率偏移。 Converting complex signals to real signals substantially corresponding to the frequency offset. 特别地,如图3A中所示的实信号的频谱被移到如图3B中所示的基带。 In particular, the frequency spectrum of the real signal shown in Fig 3A is shifted to the baseband as shown in FIG 3B.

LPF 213将高频域的镜像分量从移到基带的信号中去除,如图3C所示。 The LPF 213 for removing the image component from the signal of high frequency band shifted to baseband, as shown in FIG 3C.

插值器215使用在定时偏移估计单元221估计的定时偏移通过插值补偿码元定时偏移。 215 compensated interpolator using interpolation code timing offset estimation unit 221 estimates the timing offset by the symbol timing offset.

频率补偿单元217通过将接收到的信号复数乘以数控振荡器(NCO)值补偿频率偏移,该数控振荡器值相应于由频率偏移估计单元223提供的频率偏移和相位偏移。 Frequency compensating unit 217 by the received signal multiplied by the complex numerically controlled oscillator (NCO) the frequency offset compensation value, which value corresponds to a numerically controlled oscillator by the frequency offset estimation unit 223 provides the frequency and phase offsets.

SRRC滤波器219,即匹配滤波器,通过匹配信号使信噪比最大化以不产生码元间干扰(ISI)。 SRRC filter 219, matched filter i.e., by matching the signal to noise ratio is not generated to maximize inter-symbol interference (ISI).

定时偏移估计单元221计算在ADC 117中的采样过程中产生的定时错误的信息,并将信息提供给插值器215。 A timing offset estimation unit 221 calculates a timing error information generated in the sampling process 117 ADC, and the information provided to the interpolator 215.

频率偏移估计单元223使用作为同步信号的伪噪声(PN)序列估计频率偏移和相位偏移。 Frequency offset estimation unit 223 using the synchronization signal as a pseudo-noise (PN) sequence estimate frequency and phase offsets. 频率偏移估计单元223最后将估计的频率偏移和相位偏移转换为相位值并输出相应于转换的相位值的NCO值。 Frequency offset estimation unit 223 and the final estimated phase offset to a phase offset into the phase value and outputs a corresponding value of the conversion of NCO value.

同步检测单元225检测位于OFDM码元之前的PN序列的准确位置。 Synchronization detection unit 225 detects the PN sequence located at the exact position of the previous OFDM symbol. 检测到的PN序列的位置被提供给频率偏移估计单元223、均衡器227、和傅立叶变换单元229。 Position to the detection of the PN sequence is provided to the frequency offset estimation unit 223, an equalizer 227, and a Fourier transform unit 229. 频率偏移估计单元223通过PN序列的相关性来估计频率偏移。 Frequency offset estimation unit 223 by the PN sequence correlation to estimate the frequency offset. 均衡器227使用PN序列均衡接收到的训练模式的信号。 The equalizer 227 using the signal equalization of the received PN sequence training mode. 傅立叶变换单元229使用PN序列的位置信息有选择地只对OFDM码元进行傅立叶变换。 Fourier transform unit 229 using the PN sequence information to selectively position only Fourier transformed OFDM symbol.

均衡器227使用PN序列估计多径,并从而去除接收到的信号的多径干扰。 Estimating multipath equalizer 227 using a PN sequence and the received signal so as to remove multipath interference.

傅立叶变换单元229将处理的时域信号变换为频域信号。 Fourier transform time-domain signal processing unit 229 into a frequency domain signal.

FEC单元231根据预定的错误检测方法检测和纠正变换的频域信号中的错误。 FEC frequency domain signal conversion unit 231 to detect and correct an error in accordance with a predetermined error detection method.

本发明一实施例的TDS-OFDM接收机在傅立叶变换之前,通过估计时域中的频率偏移和定时偏移进行同步。 TDS-OFDM receiver of an embodiment of the present invention prior to Fourier transform the time domain by the frequency offset estimation and timing synchronization offset. TDS-OFDM接收机也使用同步信号估计多径并去除估计的多径的干扰。 TDS-OFDM receiver using a sync signal estimate multipath and removing multipath interference estimate. 结果,与一般的多径接收机相比,在更短的时间内进行同步和均衡。 As a result, compared with the general rake receiver, synchronization and equalization in a shorter period of time.

图4是本发明的另一实施例的TDS-OFDM接收机的框图。 FIG 4 is a block diagram of a TDS-OFDM receiver according to another embodiment of the present invention. 如图4中所示,模拟处理单元100与第一实施例中的相同,因此为了简明省略了对模拟处理单元100的详细描述。 , Example 100 is the same as the first embodiment shown in FIG analog processing unit 4, and therefore detailed description is omitted for conciseness of the analog processing unit 100. 本发明的另一实施例的数字处理单元400包括:频率补偿单元411、低通滤波器(LPF)413、插值器415、SRRC滤波器417、定时偏移估计单元419、频率偏移估计单元421、同步检测单元423、均衡器425、傅立叶变换单元427、和FEC单元429。 The digital processing unit according to another embodiment of the present invention 400 comprises: a frequency compensation unit 411, a low pass filter (LPF) 413, interpolator 415, SRRC filter 417, a timing offset estimation unit 419, a frequency offset estimation unit 421 , the synchronization detection unit 423, an equalizer 425, a Fourier transform unit 427, and FEC section 429.

频率补偿单元411通过将接收到的信号复数乘以NCO值补偿频率偏移,该NCO值相应于由频率偏移估计单元421提供的频率偏移和相位偏移。 Frequency compensating unit 411 by the received signal multiplied by the complex NCO frequency offset compensation value, which corresponds to an NCO value of the frequency offset by the frequency offset estimation unit 421 and the phase offset provided. 频率偏移估计单元421提供用于将采样信号移到基带的偏移频率和相应于估计的频率偏移的NCO值。 Frequency offset estimation unit 421 provided for the sampling frequency of the baseband signal moves the offset and corresponding to the NCO value of the estimated frequency offset. 因此,频率补偿单元411通过将偏移频率和NCO值复数乘以接收到的采样信号将接收到的采样信号移到基带,并补偿频率偏移。 Accordingly, the frequency offset compensation unit 411 by the frequency and NCO value sampled signal is multiplied by the complex received signal of the received samples shifted to baseband, and the frequency offset compensation.

LPF 413去除高频域的镜像分量,该镜像分量产生于被移到基带的采样信号中。 LPF 413 eliminate the image frequency domain components, the image components are moved to the sampling signal to generate the base tape.

插值器415使用在定时偏移估计单元419估计的码元定时偏移通过插值来补偿码元定时偏移。 Interpolator 415 used in the symbol timing offset estimation unit 419 estimates the timing offset is compensated by interpolation symbol timing offset. 如果插值器415被设计为起LPF的功能,则LPF 413可以省略。 If the interpolator 415 is designed to function from the LPF, the LPF 413 may be omitted.

SRRC滤波器417,即匹配滤波器,通过匹配信号将信噪比最大化以不产生ISI。 SRRC filter 417, matched filter i.e., by matching the signal to noise ratio maximized no ISI.

定时偏移估计单元419估计在采样过程中产生的码元定时偏移,并将估计的码元定时偏移提供给插值器415。 A timing offset estimation unit 419 estimates symbols generated during the sampling timing offset estimation and symbol timing offset provided to the interpolator 415.

频率偏移估计单元421使用PN序列估计频率偏移和相位偏移。 Frequency offset estimation unit 421 estimates a frequency offset using the PN sequence and phase offset. 频率偏移估计单元421最后将估计的频率偏移和相位偏移转换为相位值,并输出相应于转换的相位值的NCO值。 Frequency offset estimation unit 421 estimates the final offset into a phase shift and phase values, and outputs the converted phase values ​​corresponding to an NCO value. 频率偏移估计单元421将偏移游程频率(shiftingrunning frequency)设置成与在一实施例中的分离/移动单元211中将采样信号移到基带一样多。 Frequency offset estimation unit 421 will run an offset frequency (shiftingrunning frequency) provided with a separate embodiment of embodiment / mobile unit 211 will be sampled at as many signals shifted to baseband. 因此,频率补偿单元411基于设置的偏移频率补偿估计的偏移频率偏移。 Accordingly, the frequency offset compensating unit 411 to compensate the frequency offset based on the offset frequency estimate provided.

同步检测单元423检测位于OFDM码元之前的PN序列的准确位置。 Synchronization detection unit 423 detects the PN sequence located at the exact position of the previous OFDM symbol. 检测到的PN序列的位置被提供给频率偏移估计单元421、均衡器425、和傅立叶变换单元427。 Position to the detection of the PN sequence is provided to the frequency offset estimation unit 421, an equalizer 425, and a Fourier transform unit 427.

均衡器425使用PN序列估计多径,并去除接收到的信号的多径干扰。 The equalizer 425 estimates multipath PN sequence is used, and removal of the signal received multipath interference.

傅立叶变换单元427将处理的时域的信号转换为频域的信号。 Convert the time domain signal of the Fourier transform unit 427 to the processed signal in the frequency domain.

FEC单元429根据预定的错误检测方法检测和校正变换的频域信号中的错误。 FEC frequency domain signal conversion unit 429 for detecting and correcting errors in accordance with a predetermined error detection method.

频率偏移估计单元421,而不是第一实施例中的分离/移动单元211,设置用于将采样信号移到基带的偏移频率。 Frequency offset estimation unit 421, instead of the first embodiment of the separating embodiment / mobile unit 211, is provided for the offset frequency of sampling signal shifted to baseband. 因此,频率补偿单元411基于设置的频率补偿估计的频率偏移。 Accordingly, the frequency offset compensating unit 411 based on the frequency estimate frequency compensation is provided.

图5是表示本发明的一实施例的TDS-OFDM的信号的处理方法的流程图。 FIG 5 is a flowchart showing a method of the TDS-OFDM signal according to an embodiment of the present invention. 参照图2和5,信号处理方法将在下文描述。 Referring to FIGS. 2 and 5, a signal processing method will be described below.

一般的模拟广播信号的信道频率范围从几十MHz至几百MHz,包括甚高频(VHF)带和超高频(UHF)带。 Channel frequency of an analog broadcast signal range is generally from several tens MHz to several hundreds of MHz, including very high frequency (VHF) band and the ultra high frequency (UHF) band. 由于数字广播信号也使用模拟广播信号的信道,在步骤S511,通过天线接收的信号在调谐器111中被转换到IF。 Since the digital broadcast signal is also an analog broadcast signal channel, in step S511, the signal received through an antenna is converted to IF in the tuner 111.

在步骤S513,SAW滤波器113将转换的IF信号滤波到信道的带宽附近,并去除相邻信道的干扰和在频率转换过程中产生的镜像分量。 In step S513, IF SAW filter 113 filters the signal converted into the vicinity of the bandwidth of the channel, and removing adjacent channel interference and image components generated in the frequency conversion process.

AGC单元119测量在ADC 117中采样的信号的功率并计算功率误差,IF放大器115基于功率误差调整IF信号的增益。 AGC power measurement unit 119 calculates a power error and ADC 117 sampled signals, IF amplifier 115 to adjust the gain based on the power error of the IF signal.

在步骤S515,ADC 117通过采样、量化、和编码转换从IF放大器115输出的IF信号。 In step S515, ADC 117 through sampling, quantization, encoding and converts the IF signal output from IF amplifier 115.

在步骤S521,分离/移动单元211将只具有实部的采样信号转换为复信号,并将复信号移到基带。 In step S521, the sampling signal conversion, separation / mobile unit 211 is only a real part of the complex signal and the complex baseband signal moves. 在步骤S523,去除镜像分量,该镜像分量产生于被LPF 213移到基带的信号的高频域中。 In step S523, removing image components, the image components generated in the frequency domain is moved to the LPF 213 in the baseband signal.

在步骤S525,SRRC滤波器219将信号匹配滤波以防止ISI。 In step S525, SRRC filter 219 matched filtered signal to prevent ISI.

在步骤S527,插值器215基于在定时偏移估计单元221中估计的码元定时偏移补偿码元定时偏移。 In step S527, the interpolator 215 based on the timing offset compensation code symbol timing offset estimation unit 221 estimates a symbol timing offset.

在步骤S529,频率补偿单元217使用在频率偏移估计单元223中使用PN序列估计的频率偏移和相位偏移补偿频率偏移。 In step S529, the frequency compensating unit 217 used in the frequency offset estimation unit 223 using the estimated frequency offset PN sequence phase offset and the frequency offset compensation. 具体地讲,频率偏移估计单元223基于在同步检测单元225检测到的PN序列的准确位置信息估计频率偏移和相位偏移。 Specifically, the frequency offset estimation unit 223 based on the accurate position information detected by the PN sequence synchronization detection unit 225 estimates a frequency offset and phase offset.

在步骤S531,均衡器227基于PN序列的位置信息使用接收到的OFDM信号的PN序列来估计多径,并从而去除由于信道环境引起的多径干扰。 In step S531,, the equalizer 227 based on the position information of the PN sequence PN sequence using the received OFDM signal to estimate the multipath, and so as to remove interference due to multipath channel due to the environment.

在步骤S533,傅立叶变换单元229基于PN序列的位置信息对相应于OFDM信号的用户数据的间隔进行傅立叶变换。 In step S533, the Fourier transform unit 229 based on the position information of the PN sequence corresponding to the Fourier transform interval of user data within the OFDM signal.

在步骤S535,FEC单元231对于傅立叶变换的频域的OFDM码元通过预定的错误检测方法检测和校正错误。 In step S535, FEC unit 231 for the OFDM symbol in the frequency domain by the Fourier transform unit detects a predetermined error correction and error detection method.

如上所述,TDS-OFDM接收机进行同步以恢复时域中的频率偏移和码元定时偏移,并使用PN序列进行均衡以去除多径干扰。 As described above, TDS-OFDM receiver synchronized to a frequency offset domain recovery and symbol timing offset, and equalizing the PN sequence is used to remove multipath interference.

根据本发明的实施例,TDS-OFDM接收机具有对在无线信道环境中产生的多径具有较强的抵抗能力的多载波系统的优点、和能进行快速的同步和均衡的单载波系统的优点。 According to an embodiment of the present invention, TDS-OFDM receiver having a multi-carrier system has the advantage of multipath strong resistance is generated in the wireless channel environment in a single carrier system can be performed and the advantages of fast synchronization and equalization . 因此,TDS-OFDM接收机获得了改善的性能,从而与一般的多载波接收机相比能更快地进行同步和均衡。 Thus, TDS-OFDM receiver obtains improved performance, which can be synchronized and balanced faster as compared to a general multi-carrier receiver.

尽管描述了本发明的多种实施例,本领域的技术人员在一旦了解了基本的发明概念,便可对实施例进行另外的变动和修改。 While various embodiments are described embodiment of the present invention, those skilled in the art once understanding the basic concept of the invention, can further embodiments are variations and modifications. 因此,所附的权利要求应该包括上述实施例和落入本发明的精神和范围的所有的变动和修改。 Accordingly, the appended claims should include all of the above embodiments and variations and modifications fall within the spirit and scope of the invention.

Claims (8)

1.一种多载波接收机,包括:模-数转换器(ADC),用于采样接收到的模拟信号以转换为数字信号;定时偏移补偿装置,用于估计和补偿关于时域中的信号的码元定时偏移;频率偏移补偿装置,用于估计和补偿关于时域中的信号的频率偏移;均衡器,用于通过使用时域中的同步信号估计和去除信号的多径;傅立叶变换单元,用于将时域中的信号变换为频域中的信号。 A multi-carrier receiver, comprising: an analog - digital converter (the ADC) for sampling an analog signal to be converted to received digital signal; timing offset compensating means for time domain estimation and compensation on signal symbol timing offset; frequency offset compensation means for estimating and compensating a signal on a frequency offset in the time domain; an equalizer for multipath by using the time domain signal estimation and synchronization signal removal ; Fourier transform unit to transform a signal in the time domain to a signal in the frequency domain.
2.如权利要求1所述的接收机,还包括同步检测单元,用于检测同步信号的位置信息,其中,在同步检测单元检测到的同步信号的位置信息被至少提供给频率偏移补偿装置、均衡器、和傅立叶变换单元之一。 A receiver as claimed in claim 1, further comprising a synchronization detection unit for detecting the position information of the synchronization signal, wherein the position information of the synchronization detection unit detects the synchronization signal is supplied to a frequency offset compensating means at least , an equalizer, and one Fourier transform unit.
3.如权利要求1所述的接收机,其中,定时偏移补偿装置包括:定时偏移估计单元,用于估计在采样过程中产生的码元定时偏移;和插值器,用于基于估计的码元定时偏移补偿码元定时偏移。 3. The receiver according to claim 1, wherein the timing offset compensating apparatus comprising: a timing offset estimation unit for estimating the code generated during the sampling timing offset element; and interpolator for estimating based the symbol timing offset compensation symbol timing offset.
4.如权利要求1所述的接收机,其中,频率偏移补偿装置包括:频率偏移估计单元,用于通过使用时域中的同步信号估计频率偏移;和频率补偿单元,用于基于估计的频率偏移补偿频率偏移。 4. The receiver according to claim 1, wherein the frequency offset compensation means comprises: a frequency offset estimation unit for estimating a synchronization signal by using the frequency offset in the time domain; and a frequency compensation unit, based on estimating the frequency offset frequency offset compensation.
5.一种多载波接收机的信号处理方法,包括:转换步骤,用于采样接收到的模拟信号并转换为数字信号;定时偏移补偿步骤,用于估计和补偿关于时域中的信号的码元定时偏移;频率偏移补偿步骤,用于估计和补偿关于时域中的信号的频率偏移;均衡步骤,用于通过使用时域中的同步信号估计和去除信号的多径;和傅立叶变换步骤,用于将时域中的信号变换为频域中的信号。 5. A signal processing method for a multi-carrier receiver, comprising: a conversion step of sampling the analog signal and converts the received digital signal; timing offset compensation step, for estimating and compensating signals on the time domain symbol timing offset; frequency offset compensation step, for estimating and compensating signals on the time domain shift; equalization step, for estimating a synchronization signal and the multipath signal is removed by using the time domain; and Fourier transform step for transforming the time domain signals to frequency domain signals.
6.如权利要求5所述的方法,还包括同步检测步骤,用于检测同步信号的位置信息,其中,检测到的同步信号的位置信息被至少提供给频率偏移补偿步骤、均衡步骤、和傅立叶变换步骤之一。 6. The method of claim 5, further comprising synchronous detection step of detecting the position information of the synchronization signal, wherein the position information of the detected synchronization signal is provided at least to the frequency offset compensation step, equalization step and one of the Fourier transform step.
7.如权利要求5所述的方法,其中,定时偏移补偿步骤包括下述步骤:估计在采样过程中产生的码元定时偏移;和基于估计的码元定时偏移补偿码元定时偏移。 7. The method according to claim 5, wherein the timing offset compensation step comprises the steps of: estimating a code generated in the course of the sampling timing offset element; and symbol timing based on the estimated symbol timing offset compensation bias shift.
8.如权利要求5所述的方法,其中,频率偏移补偿步骤包括下述步骤:通过使用时域中的同步信号估计频率偏移;和基于估计的频率偏移补偿频率偏移。 8. The method as claimed in claim 5, wherein the frequency offset compensation step comprises the steps of: estimating a synchronization signal by using the offset in the frequency domain; and a frequency offset compensation based on the estimated frequency offset.
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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
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CN101506667B (en) 2006-08-25 2012-11-14 特克特朗尼克公司 Improved interpolation of complex signal
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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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