CN1258276C - Channel equalizer of single carrier wave receiver and its equalizing method - Google Patents

Channel equalizer of single carrier wave receiver and its equalizing method Download PDF

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CN1258276C
CN1258276C CN 03156655 CN03156655A CN1258276C CN 1258276 C CN1258276 C CN 1258276C CN 03156655 CN03156655 CN 03156655 CN 03156655 A CN03156655 A CN 03156655A CN 1258276 C CN1258276 C CN 1258276C
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ghost
symbol
level
symbols
input
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CN1494287A (en
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张龙德
金才铉
郑晋熙
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三星电子株式会社
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Abstract

提高了均衡效率的单载波接收机的信道均衡器包括:前馈滤波器,从广播信号各符号中消除前重影;反馈滤波器,从广播信号各符号中消除后重影;加法器,将消除了前重影的符号和消除了后重影的符号相加;级别判决单元,参考预定级别数据确定在加法器中相加符号的级别,然后将确定级别反馈到反馈滤波器;网格解码器,对在加法器中相加符号执行网格解码,并且具有总解码深度N(N=自然数)和追溯延迟总长度N×K(K=自然数);误差计算器,计算在加法器中相加符号和在级别判决单元中确定级别之间的误差值;及网格控制单元,控制网格解码器以便从网格解码器输出的多个解码符号可以被输入到反馈滤波器,以响应在误差计算器中得到的误差。 Improved efficiency single carrier receiver equalizing a channel equalizer comprises: a feedforward filter, to eliminate from the broadcast signal of each symbol preghosts; feedback filter, to eliminate the ghost from the broadcast signal of each symbol; adder, the eliminating ghost symbols before and after the elimination of the ghost adding symbols; level decision means, the reference level data is determined by adding a predetermined level sign in an adder, and then determine the level of feedback to the feedback filter; trellis decoding , a trellis decoding symbolic execution of the addition in the adder, and having a total depth of decoded N (N = a natural number) and the total length of the delay retroactive N × K (K = a natural number); error calculator for calculating the phase in the adder plus sign and the error value between the level determination in the level judging unit; and a mesh control means controls so as to output from the trellis decoder trellis decoder decoding a plurality of symbols may be input to the feedback filter, in response to error error calculator obtained.

Description

单载波接收机的信道均衡器及其均衡方法 Single carrier receiver equalizer and a channel equalization method

技术领域 FIELD

本发明涉及单载波接收机的信道均衡器,更具体地说,涉及利用网格解码器提供的多个解码符号对信道环境执行接收信号均衡的单载波接收机的信道均衡器,以及其信道均衡方法。 The present invention relates to a single carrier receiver channel equalizer, and more particularly, relates to the use of a plurality of decoded symbols of a trellis decoder performs the received signal to provide channel equalization single carrier receiver environment, a channel equalizer and a channel equalization which method.

背景技术 Background technique

关于数字广播信号的传输方案,主要有残留边带(VSB)调制方案和编码正交频分多路复用(COFDM)调制方案。 Transmission scheme on a digital broadcast signal, there are an orthogonal modulation scheme and a coding vestigial sideband (VSB) frequency division multiplexing (COFDM) modulation scheme. VSB调制方案利用单载波传输广播信号。 VSB modulation scheme using a single carrier transmission of the broadcast signal. COFDM调制方案通过多个传输信道多路复用并传输广播信号。 COFDM modulation scheme by a plurality of transport channel multiplexing and transmitting a broadcast signal. VSB调制方案是一种美国数字广播传输方案,已经被包括韩国和美国在内的许多国家采用,而COFDM调制方案是一种欧洲数字广播传输方案。 VSB modulation scheme is an American digital broadcasting transmission scheme, has been in many countries, including South Korea and the United States are used, and COFDM modulation scheme is a European digital broadcasting transmission scheme.

美国地面波(terrestrial wave)数字电视的VSB调制所采用的当前标准是ATSC-8VSB,它将传输的广播信号转换为8级。 The current standard American ground wave (terrestrial wave) VSB modulated digital television is used ATSC-8VSB, which converts the broadcast signals transmitted as 8. 同时,VSB接收机接收已通过VSB调制所调制过的广播信号。 Meanwhile, the receiver receives VSB modulated by the VSB modulated broadcast signal. VSB接收机被提供了一个信道均衡器,用于均衡出现在传输信道中的失真。 VSB receiver is provided with a channel equalizer for equalizing the distortion occurs in the transmission channel.

图1以示例方式示出在传统单载波接收机中采用的信道均衡器的示意图。 Figure 1 shows by way of example a schematic diagram of the channel equalizer is employed in the conventional single-carrier receiver. 单载波接收机的信道均衡器包括前馈滤波器10,反馈滤波器30,加法器40和双向限幅器50。 Single carrier receiver channel equalizer includes a feedforward filter 10, feedback filter 30, an adder 40 and a bidirectional limiter 50. 具有前馈滤波器10和反馈滤波器30的信道均衡器被称为判决反馈均衡器(DFE)。 Feedforward filter 10 and feedback filter channel equalizer 30 is called a decision feedback equalizer (DFE).

前馈滤波器10从广播信号的各个符号中消除前重影的影响,反馈滤波器30从广播信号的各个符号中消除后重影的影响。 A feed forward filter 10 to eliminate the influence of the ghost before each symbol from a broadcast signal, the influence of the post-ghost filter 30 to eliminate feedback from the broadcast signal of each symbol. 加法器将前重影消除后从前馈滤波器10得到的残留值与后重影消除后从反馈滤波器30得到的残留值相加。 Adder front ghost canceling residual value after feedforward filter 10 to obtain the residual value of the post-ghost elimination resulting from the feedback filter 30 are added.

双向限幅器50确定从加法器40得到的在预定级别中最近级别的信号级别。 Bidirectional limiter 50 determines the level of the signal obtained from the adder 40 in the most recent level of the predetermined level. 双向限幅器50将所确定的信号级别反馈给反馈滤波器30。 Bidirectional limiter 50 the determined level of the signal fed back to the feedback filter 30.

前馈滤波器10包括缓冲单元12,乘法器14以及第二加法器16。 Feedforward filter 10 comprises a buffer unit 12, a multiplier 14 and a second adder 16. 缓冲单元12按输入顺序并以符号单位,在各个缓冲器Z-1中存储和缓冲广播信号。 Buffering unit 12 and an input order in symbol unit, each Z-1 stored in the buffer and the buffered broadcast signal. 乘法器14将在缓冲单元12的各个缓冲器Z-1中保存和缓冲的各个符号乘以均衡器(未示出)的前馈滤波器抽头系数,因此,从广播信号中消除前重影。 Multiplied by the multiplier 14 prior to the equalizer in the respective buffers of the buffer unit 12 in the Z-1 of each symbol and stored in a buffer (not shown) of the feed-forward filter tap coefficients, thus eliminating ghost before from the broadcast signal. 第二加法器16将广播信号消除前重影后从乘法器14中得到的值加起来。 The second adder 16 to eliminate the broadcast signal obtained from the preghost value multiplier 14 together.

反馈滤波器30包括缓冲单元32,乘法器34和第三加法器36。 Feedback filter 30 comprises a buffer unit 32, a multiplier 34, and a third adder 36. 缓冲单元32按输入顺序并以符号单位连续地存储和缓冲在双向限幅器50中确定的级别数据,乘法器34从缓冲单元32的各个缓冲器Z-1中存储和缓冲的各个符号中消除后重影。 Buffer unit 32 and successively stored in a symbol unit, and the data buffer 50 at the level determined by the limiter bidirectional input order, the multiplier 34 from the respective buffer to eliminate various symbol Z-1 of the buffer unit and the buffer memory 32 after ghosting. 加法器36将从广播信号中消除后重影之后所得到的值加起来。 The adder value after eliminating the add ghost 36 obtained from the broadcast signal.

利用图1的信道均衡器,所确定级别的数据作为反馈滤波器30的输入由双向限幅器50输入。 Using a channel equalizer of FIG. 1, the determined level of data input as an input of the feedback filter 30 by a bidirectional limiter 50. 如果在确定级别数据时在双向限幅器50中出现了误差,那么该误差级别数据便经过反馈滤波器30,并且在加法器40中被加到前馈滤波器10的输出值上。 If an error has occurred in the bidirectional limiter 50 in determining the level of the data, then the data will be error level via the feedback filter 30, and is added to the output value of the feedforward filter 10 in the adder 40.

同时,在依据为广播信号设置的级别数量而确定级别数据时,双向限幅器50通常具有不同的性能。 Meanwhile, when the broadcast signal based on the number of levels is set to determine the level of data, a bidirectional limiter 50 generally have different properties. 例如,对于广播信号的相同电量值,具有8级的8-VSB调制在信号级别之间具有一个间隙,该间隙是具有4级的4-VSB调制信号级别间隙的一半。 For example, for the same capacity value broadcasting signal, having eight 8-VSB modulation of the gap between the signal having a level, the gap having a half level of 4-VSB modulation signal level of the gap 4. 因此,双向限幅器可能具有误差的级别数据确定的可能性增加了。 Thus, the possibility of double limiter level data may be determined with an error is increased.

随着双向限幅器50的误差增加,在反馈滤波器30中发生了误差传播。 With bidirectional error limiter 50 increases, error propagation occurs in the feedback filter 30. 进一步,依据双向限幅器50的误差,信噪比(SNR)大大地降低了,因此,降低了信道均衡器的性能,并且在整体上降低了单载波接收机的接收性能。 Further, according to the error bidirectional limiter 50, the signal to noise ratio (SNR) greatly reduced, thus reducing the performance of the channel equalizer, and reduces the reception performance of the single carrier receiver as a whole.

为了避免由双向限幅器50确定的误差级别数据带来的信道均衡器的性能恶化,可以采用网格调制(TCM)对输入到信道均衡器的信号执行网格编码。 In order to avoid performance deterioration of the error data determined by the bi-level limiter 50 caused by the channel equalizer may be employed grid modulation (TCM) performing trellis encoding on the signal inputted to the channel equalizer.

图2示出适于用在传统单载波接收机即传统VSB接收机中的另一种信道均衡器。 FIG 2 shows another channel equalizer suitable for use in conventional single carrier receiver i.e. conventional VSB receiver. 如图2所示,信道均衡器包括前馈滤波器10、反馈滤波器30、加法器40、双向限幅器50、计算单元60以及网格调制(TCM)单元70。 2, the channel equalizer comprises a feedforward filter 10, feedback filter 30, an adder 40, a bidirectional limiter 50, a calculating unit 60, and a grid modulation (TCM) unit 70.

前馈滤波器10消除广播信号的各个符号的前重影影响。 Preghost feedforward filter 10 eliminate the influence of each symbol of the broadcast signal. 反馈滤波器30消除广播信号各个符号的后重影。 A feedback filter 30 to eliminate the broadcast signal of each symbol post-ghost. 加法器40将前重影消除后在前馈滤波器10中得到的残留值加到后重影消除后在反馈滤波器30中得到的残留值上。 An adder in the feedforward filter 40 after 10 preghost cancellation value to the obtained residue remaining in the feedback filter 30 values ​​obtained after eliminating ghost. 双向限幅器50判决在加法器40得到的预定级别中最近级别的信号级别。 Bidirectional limiter 50 at a predetermined level the level of the decision signal derived from the adder 40 in the latest level.

计算单元60计算加法器40和双向限幅器50输出值的差别。 Calculation unit 60 calculates the adder 50 outputs a difference value of 40 and a bidirectional limiter. TCM单元70对加法器40输出值执行网格解码。 TCM trellis decoding unit 70 performs the output value of the adder 40. TCM单元70将网格解码的结果值反馈到反馈滤波器30中。 TCM trellis decoding unit 70 the result is fed back to the value of the feedback filter 30. 因此,反馈滤波器30根据从TCM单元70反馈的网格解码数据,从广播信号的各个符号中消除后重影。 Thus, the feedback filter 30 in accordance with the ghost, eliminating from each symbol of the broadcast signal TCM trellis decoding data from the feedback unit 70.

由于网格解码所引起的反馈延迟,在反馈滤波器30根据从双向限幅器50输出的值而从各个符号中消除后重影的预定时间段中,网格解码数据被输入到反馈滤波器30中。 Due to the feedback delay caused by the trellis decoder in the feedback filter 30 according to a predetermined period of time after a ghost is eliminated from each of the 50 symbols from the value output from the bidirectional limiter, trellis-decoded data is input to the feedback filter 30. 因此,反馈滤波器30必须根据在双向限幅器50中所确定的级别数据从各个符号中消除后重影,直到网格解码数据从TCM中输入,这会导致双向限幅器50错误地确定该级别数据。 Thus, the feedback filter 30 must be removed from the post-ghost respective symbols in accordance with bi-level data slicer 50 as determined by the grid until the decoded data input from the TCM, which will lead to double limiter 50 erroneously determined the level data.

进一步,在其中对广播信号具有顽固性(robust)的重影在TCM单元70的输出延迟之前就存在的信道环境下,即使在使用TCM单元70的信道均衡器中也不能保证较高的均衡性能。 Further, having a broadcast signal in refractory (Robust) ghost before outputting TCM unit 70 delays there is a channel environment, even in the TCM unit the channel equalizer 70 does not guarantee a high equalization performance .

发明内容 SUMMARY

因此,本发明的一个方面是提供一种使用网格解码消除重影的残留边带(VSB)均衡器的信道均衡器,即使在对广播信号具有顽固性的重影是在网格解码引起的输出延迟之前而存在的信道环境下也能够改进均衡性能,以及其信道均衡方法。 Accordingly, one aspect of the present invention is to provide a trellis decoding eliminate ghost vestigial sideband (VSB) equalizer channel equalizer having a refractory ghost caused broadcasting signal decoded even if the grid the output of the delay before a channel environment exists equalization performance can be improved, as well as channel equalization method.

本发明的另一个方面和优点将部分地在下面的说明中提出,部分地从说明书中是显而易见的,或由本发明的实践可以知道。 Further aspects and advantages of the invention will in part be made in the following description, part will be apparent from the description, or by the practice of the present invention can be known.

为了实现本发明的上述和/或其它方面,提高了均衡效率的单载波接收机的信道均衡器包括从广播信号各个符号中消除前重影的前馈滤波器;从广播信号的各个符号中消除后重影的反馈滤波器;将消除了前重影的符号加到消除了后重影的符号上的加法器,所述结合符号被输出;参考预定级别的数据确定在加法器上相加的符号级别,然后将所确定的级别反馈到反馈滤波器;对在加法器上相加的符号执行网格解码,并且具有总解码深度N(N=自然数)和追溯延迟的总长度为N×K(K=自然数)的网格解码器;计算在加法器中相加的符号和级别判决单元确定的级别之间误差值的误差计算器;以及控制网格解码器以便当相应于在误差计算器中获得的所述误差值的信噪比(SNR)等于或大于预定的阈值时从网格解码器输出的多个解码符号可以被输入到反馈滤波器的网格控制 To achieve the above and / or other aspects of the present invention improves the efficiency of single carrier receiver equalizing a channel equalizer comprising a feedforward filter to eliminate ghosts in front of each symbol from a broadcast signal; eliminated from the broadcast signal of each symbol after the ghost feedback filter; would eliminate the ghost before the symbol was added to the adder eliminates ghost symbols, the symbols are combined output; the reference data is determined by adding a predetermined level in the adder symbol level, and then the determined level of feedback to the feedback filter; for performing trellis decoding on the symbol of adder, and having a total depth of decoded N (N = a natural number) and the total length of the delay is traced N × K (K = a natural number) of the trellis decoder; symbol and a level decision unit calculates the addition in an adder determined error value between the error calculator level; and a control grid so that when the decoder corresponds to the error calculator noise ratio of the obtained error value (SNR) is equal to or greater than a predetermined threshold value from the plurality of decoded symbols output from the trellis decoder may be input to the feedback filter grid control 元。 Yuan.

从解码深度状态n(n≤N,N=自然数)输出的解码符号被输入到反馈滤波器的第1+(n×K)个滤波器抽头中。 N decoder from the decoding depth state symbols (n≤N, N = natural number) is input to the output of the feedback filter 1+ (n × K) of filter taps. 因此,从解码深度状态输出的解码符号被分别输入到反馈滤波器的相应滤波器抽头中。 Thus, the depth from the decoding state outputs decoded symbols are input to respective filter taps of the feedback filter.

利用来自级别判决单元所确定的级别的输入,反馈滤波器根据所确定的级别消除各个符号的后重影,并且,利用来自网格解码器的解码符号的另一个输入,反馈滤波器根据解码的符号消除后重影。 Using the input level from the decision unit determines the level of the feedback filter removes post-ghost respective symbol in accordance with the determined level, and by the other input decoded symbols from the trellis decoder, the feedback filter based on the decoded symbol eliminate the ghosting.

同时,为了实现本发明的上述和/或其它方面,单载波接收机的信道均衡方法包括,利用前馈滤波器消除输入信号各个符号的前重影;利用反馈滤波器消除输入信号各个符号的后重影;结合消除了前重影的符号和消除了后重影的符号,所述结合符号被输出;执行反馈操作,该反馈操作参考预定级别的数据来判决作为对应级别的符号的总和以向反馈滤波器输入所确定的级别;根据预定的误差更新算法,计算这些符号总和与所确定级别之间的误差;执行网格解码操作,利用网格解码器执行网格解码;以及执行控制操作,网格在对应于误差值的信噪比等于或大于预定的阈值时,控制操作将来自网格解码器的解码符号输入到反馈滤波器中。 Meanwhile, in order to achieve the above and / or other aspects, a single carrier channel equalization method of the present invention includes a receiver, before the feedforward filter to eliminate ghost of the input signal using the respective symbols before; after use of each symbol of the feedback filter input signal to eliminate ghost; binding eliminating ghost symbols symbol before and after the elimination of ghost, the combined symbol is outputted; feedback operation is performed, the predetermined reference level feedback operation data corresponding to the decision level as the sum of the symbol to feedback filter inputs the determined level; update algorithm according to a predetermined error, calculating an error between the sum of the determined level symbols; performing trellis decoding operation is performed using a trellis decoder trellis decoding; and performing a control operation, when the grid values ​​corresponding to the error signal to noise ratio greater than or equal to a predetermined threshold value, the control operation of the decoded symbols from the trellis decoder is input to the feedback filter.

从解码深度状态n(n≤N,N=自然数)输出的解码符号被输入到反馈滤波器的第1+(n×K)个滤波器抽头中。 N decoder from the decoding depth state symbols (n≤N, N = natural number) is input to the output of the feedback filter 1+ (n × K) of filter taps. 因此,从解码深度状态输出的解码符号被分别输入到反馈滤波器的相应滤波器抽头中。 Thus, the depth from the decoding state outputs decoded symbols are input to respective filter taps of the feedback filter.

反馈滤波器根据所确定的级别从各个符号中消除后重影,并且,利用来自网格解码器的解码符号的输入,根据解码符号从各个符号中消除后重影。 Elimination feedback filter based on the determined level from the post-ghost respective symbol, and by decoding the input symbols from the trellis decoder, to eliminate the ghost from the respective symbols according to the decoded symbol.

结果,即使当在误差计算器上得到的误差值对应的SNR等于或大于预定的阈值时,根据从网格解码器输入的解码数据而执行滤波的反馈滤波器仍避免了由于级别判决单元的错误级别判决而引起的均衡效率降低。 As a result, even when an error calculator on the obtained error value corresponding to the SNR greater than or equal to a predetermined threshold value, and the feedback filter performs filtering of the decoded data input from trellis decoder still avoiding errors due to the level decision unit reduce the level of efficiency balanced judgment caused.

附图说明 BRIEF DESCRIPTION

结合下面的附图考虑,从下面对优选实施例的说明,本发明的这些和/或其它方面和优点将会变得很清晰并易于理解。 Considered in conjunction with the following drawings, from the following description of the preferred embodiments, these and / or other aspects and advantages of the present invention will become clear and easy to understand.

图1是示出适合用在传统单载波接收机中的信道均衡器的示意图;图2是示出适合用在传统单载波接收机中的另一种信道均衡器的示意图; 1 is a schematic diagram showing a conventional single carrier suitable for use in the receiver of the channel equalizer; FIG. 2 is a schematic diagram illustrating another channel equalizer suitable for use in conventional single-carrier receiver of;

图3是依据本发明实施例的单载波接收机的示意方框图;图4是适合用于图3所示单载波接收机中使均衡器性能提高的信道均衡器的方框图;图5是说明图4网格解码器的网格解码数据输出的示意图;图6是列出依据图4网格解码器的网格解码输出延迟的信噪比列表;图7是说明图3和4所示单载波接收机的信道均衡方法的流程图。 3 is a schematic block diagram of single carrier receiver according to an embodiment of the present invention; FIG. 4 is a block diagram of a single-carrier suitable for manipulation improved equalizer performance receiver channel equalizer shown in FIG. 3; FIG. 5 is a diagram illustrating 4 a schematic view of the mesh grid decoded data output from the decoder; FIG. 6 is a table listing the decoded output signal to noise ratio listing grid trellis decoder 4 according to FIG delay; FIG. 7 is a single-carrier receiver shown in FIG. 3 and 4 the method of channel equalization flowchart machine.

具体实施方式 Detailed ways

下面将详细参考本发明的优选实施例,这些示例表示在了附图中,其中相同的参考数字在各个地方皆指相同的部件。 In detail below with reference to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts in all the various places. 下面将说明实施例,以便参考附图来说明本发明。 Example embodiments will now be described, with reference to the accompanying drawings to illustrate the present invention.

下面将参考附图详细地说明本发明。 The present invention will be explained with reference to the drawings in detail below.

参照示出依照本发明的实施例的VSB接收机的方框图的图3,说明VSB接收机,一种单载波接收机的结构。 Referring VSB receiver shown in accordance with embodiments of the present invention. FIG. 3 is a block diagram, described VSB receiver, the receiver structure of a single carrier. 下面将VSB接收机作为单载波接收机的例子进行说明。 Examples of the VSB receiver will be a single carrier receiver will be described. 但是,本发明并不限于此。 However, the present invention is not limited thereto.

如图3所示,VSB接收机包括解调器81,失真补偿器82,梳状滤波器83,信道均衡器84,相位恢复单元85,网格解码器87,去交织器88和里德-所罗门解调器89。 3, the VSB receiver comprising a demodulator 81, a distortion compensator 82, the comb filter 83, a channel equalizer 84, the phase recovery unit 85, trellis decoder 87, a deinterleaver 88 and a Reed - Solomon demodulator 89.

解调器81将接收的RF带宽广播信号转换为基带带宽。 The demodulator 81 receives the RF bandwidth broadcast signal into a baseband bandwidth. 失真补偿器82对从解调器81输出的广播信号,恢复段同步信号、场同步系信号和符号时序信号。 Distortion compensator 82 broadcasting signal outputted from the demodulator 81, the recovery segment sync signal, vertical sync signal and the symbol timing signal line. 梳状滤波器83从由解调器81输出的广播信号中消除NTSC(国家电视系统委员会)干扰信号。 The comb filter 83 to eliminate the NTSC (National Television System Committee) signal interference from the broadcast signal by the demodulator 81 output.

信道均衡器84补偿在广播信号传输通过传输信道期间发生的信道失真。 The channel equalizer 84 to compensate channel distortion during a broadcast signal transmitted through a transmission channel occurs. 相位恢复单元85恢复信道失真补偿后的广播信号的相位。 Phase recovery unit 85 recovers a phase of the broadcast signal of the channel distortion compensation. 网格解码器87对带有相位失真的广播信号执行网格解码,这些失真在相位恢复单元85中被恢复了。 Trellis decoder 87 performs trellis decoding broadcast signal with phase distortion, such distortions are recovered in the phase recovery unit 85. 去交织器88对应于在发送器中执行的交织,对网格解码广播信号执行去交织。 Deinterleaver 88 corresponds to the interleaving performed in the transmitter, performs trellis decoding the deinterleaved broadcasting signals. 里德-所罗门解调器89对应于在发送器中执行的里德-所罗门编码,对去交织的广播信号执行解码。 Reed - Solomon Reed demodulator 89 corresponding to the performed in the transmitter - Solomon encoding, decoding is performed on the deinterleaved broadcasting signals.

图5示出图3所示网格解码器87的一个例子。 Figure 5 shows an example of FIG. 3 trellis decoder 87. 网格解码器87的总解码深度具有状态0,1,2,...,N,并且,在以K(K=自然数)个符号为单位执行去交织的情况下,总的追溯延迟具有符号长度K×N。 A case where the total depth of the trellis decoder 87 has decoded the state 0,1,2, ..., N, and, perform deinterleaving in units of K (K = a natural number) symbols, a symbol having a total delay of traceability length K × N. 换句话说,当网格解码器87的总解码深度是在状态0,1,2,...,N时,从整个解码数据d0,d1,......,dN中随机选择的多个特定的解码数据d0,d1,......,dn(n≤自然数)被反馈到信道均衡器84中。 In other words, when the total depth of the trellis decoder 87 is decoded in the state 0,1,2, ..., N, the whole from the decoded data d0, d1, ......, dN randomly chosen more particular decoded data d0, d1, ......, dn (n≤ a natural number) is fed back to the channel equalizer 84. 因此,根据从网格解码器87反馈的特定解码数据,信道均衡器84对广播信号的各个符号执行信道均衡。 Thus, according to the particular trellis decoder 87 decodes the data fed back from the channel equalizer 84 each symbol of the broadcast signal to perform channel equalization.

图4是适合用在单载波接收机例如图3所示的VSB接收机中以提高均衡性能的信道均衡器的方框图。 FIG 4 is a block diagram for use in a single carrier receiver e.g. VSB receiver shown in Fig. 3 in order to improve the equalization performance of the channel equalizer. 图4的信道均衡器用作图3所示的信道均衡器84,相位恢复单元85和网格解码器87。 FIG 4 Used channel equalization plotted in FIG. 3 the channel equalizer 84, the phase recovery unit 85 and trellis decoder 87.

如图4所示,信道均衡器包括前馈滤波器110,反馈滤波器120,和加法器130,网格解码器140(图3中的网格解码器87),级别判决单元150,误差计算单元160,以及网格控制器170。 As shown, the channel equalizer 4 includes a feedforward filter 110, feedback filter 120, an adder 130, trellis decoder 140 (in FIG trellis decoder 387), the level decision unit 150, error calculation unit 160, and a grid controller 170.

反馈滤波器110消除广播信号的各个符号前重影的影响。 Feedback filter 110 to eliminate the influence of each symbol of the broadcast signal before the ghost. 反馈滤波器120消除广播信号的各个符号后重影。 Feedback filter 120 to eliminate the broadcast signal of each symbol ghost. 这里,构建前馈滤波器110和反馈滤波器120以便以符号为单位顺序地缓冲广播信号的输入,然后从在各个缓冲器(未示出)中缓冲的符号当中消除前重影和后重影。 Here, a feedforward filter constructed 110 and feedback filter 120 in units of symbols in order to sequentially buffer the input broadcasting signal, and then eliminating preghost respective post-ghost from the buffer (not shown) in which the symbol buffer . 图4所示的前馈滤波器110和反馈滤波器120具有的结构分别与图1的前馈滤波器10和反馈滤波器30相同。 110 and feedback filter 120 has a structure shown in FIG. 4 of the feedforward filter 10 are fed the same filter and the feedback filter 30 of FIG. 1 with the front.

加法器130将从前馈滤波器110中输出的前重影消除值M和从反馈滤波器120输出的后重影消除值L相加。 The adder 130 output from the feedforward filter 110 in front of M ghost-cancellation value outputted from the feedback filter 120 and the L value by adding ghost elimination. 网格解码器140利用在加法器130中得到的结果值Y执行网格解码。 Using a trellis decoder 140 performs trellis decoding result value Y obtained in an adder 130.

级别判决单元150确定从加法器130中得到的结果值Y在预定级别当中最近级别的级别。 Level decision unit 150 determines from the result obtained in the adder 130 the value Y level in recent level among predetermined levels. 因此,级别判决单元150提供反馈滤波器120和带有所确定级别数据D的误差计算器160。 Therefore, the level decision unit 150 provides a feedback filter 160 level error calculator 120 and the data D with the determined. 级别判决单元150可以确定与预定的广播信号相应的级别,例如4级,8级或16级。 150 may determine the appropriate level with a predetermined level decision unit broadcast signal, for example four, eight or sixteen.

误差计算器160计算出误差值E,该值是从加法器130得到的结果值Y和级别判决单元150所确定级别的数据D之间的差值。 Error calculator 160 calculates an error value E, which is the difference between the level value data D obtained from the result value adder 130 Y, and level decision unit 150 determines.

误差计算器160向前馈滤波器110,反馈滤波器120和网格控制单元170提供计算出的误差值E。 Error calculator 160 feed forward filter 110, feedback filter 170 provides the calculated error value 120 and control grid unit E. 前馈滤波器110和反馈滤波器120根据由误差计算器160提供的误差值E来更新抽头系数。 Feedforward filter 110 and feedback filter 120 to update the tap coefficients according to the error value E supplied from the error calculator 160.

根据由误差计算器160提供的误差值E,网格控制单元170控制网格解码器140的操作。 The error value E supplied from the error calculator 160, the operation unit 170 controls the grid mesh decoder 140 control. 更具体地说,当与误差计算器160中获得的误差值E相应的信噪比(SNR)等于或大于预定的阈值时,网格控制单元170控制网格解码器140,以便与特定解码深度状态即从总解码深度状态0,1,2,...,N中随机选择的解码深度状态相应的特定解码数据d0,d1,......,dn被输入到反馈滤波器120的多个相应滤波器抽头中。 More specifically, when the error calculator 160 with the obtained error value E corresponding signal to noise ratio (SNR) is equal to or greater than a predetermined threshold value, the control unit 170 controls the grid mesh decoder 140 to decode the particular depth state, that state from total depth decoding 0,1,2, ..., N the decoding depth randomly selected state corresponding specific decoded data d0, d1, ......, dn is input to the feedback filter 120 a plurality of respective filter taps.

图5表示了解码数据d0,d1,......,dn从总解码深度状态1,2,...,n(n≤N,自然数)输出的情况。 FIG. 5 shows the decoded data d0, d1, ......, dn, ..., where n (n≤N, natural number) outputted from the total depth of the decoding states 1, 2. 相应于追溯延迟长度,解码数据d0,d1,......,dn分别被输入到反馈滤波器120的相应滤波器抽头上。 Retroactive delay length corresponding to the decoded data d0, d1, ......, dn are input to respective filter taps of the feedback filter 120. 因此,从解码深度状态'0'输出的解码的数据d0被输入到反馈滤波器120的第一个滤波器抽头上,而从解码深度状态'1'输出的解码数据d1以K个符号为单位输出,这样输出到第(1+K)个滤波器抽头上。 Thus, a state decoder for decoding the depth of '0' outputted from the data d0 is input to the feedback filter of the first filter tap 120, the decoded data from the decoding depth d1 state '1' is output in units of K symbols output, so that the output to the first (1 + K) th filter tap. 从解码深度状态'n'输出的解码数据dn被输入到滤波器120的第1+(n×K)个滤波器抽头上。 The decoded data from the decoding depth dn state 'n' is input to the output of the filter 1+ (n × K) 120 of the filter taps.

当对结果值Y执行网格解码时,在网格控制单元170的控制下,网格解码器140将从特定解码深度状态输出的解码数据d0,d1,......,dn分别输入到相应滤波器抽头中。 When performing trellis decoding result value Y, the control unit under the control grid 170, the decoded data d0 from trellis decoder 140 decodes a particular state of the output of the depth, d1, ......, dn are input the respective filter taps. 因此,反馈滤波器120根据从网格解码器140输入的解码数据d0,d1,......,dn,消除各个符号的后重影。 Thus, the feedback filter 120 based on the decoded data d0 input from trellis decoder 140, d1, ......, dn, after the elimination of ghost each symbol.

因此,反馈滤波器120根据从级别判决单元150反馈的所确定级别数据,执行后重影消除滤波,并且,当解码数据d0,d1,......,dn被从网格解码器140输入时,根据解码数据d0,d1,......,dn执行各个符号的后重影消除。 Thus, the feedback filter 120 based on the feedback from the determined level of level data decision unit 150, performs the ghost canceling filter, and, when the decoded data d0, d1, ......, dn is supplied from the trellis decoder 140 when an input, in accordance with the decoded data d0, d1, ......, dn performed after each symbol ghost elimination.

结果,就可以避免由于级别判决单元150错误的级别数据确定而带来的反馈滤波器120的误差传播。 As a result, it is possible to avoid the error level decision unit 150 determines the level of data error propagation caused by feedback filter 120.

图6是根据网格解码的输出延迟,网格解码器140输出信号的信噪比列表。 FIG 6 is a trellis-decoded output delay, a listing grid SNR decoder 140 output signal. 在该实验中使用的广播信号是巴西D信道。 Broadcast signal used in this experiment is the D-channel in Brazil.

如图6所示,当网格解码器140的解码深度是'0'时,巴西D信道具有最大的SNR。 6, when the decoding depth of the trellis decoder 140 is '0', Brazil D channel having the largest SNR. 因此,就可能是网格解码数据d0被从网格解码器140输入到反馈滤波器120中。 Thus, it may be trellis-decoded data d0 is input from the trellis decoder 140 to the feedback filter 120. 因此,由于网格解码数据d0从网格解码器140中被输入到反馈滤波器120中,均衡效率大大地提高了,即使当巴西D信道中广播信号的前部包含了具有顽固性的重影。 Accordingly, since the trellis-decoded data d0 from trellis decoder 140 is input to a feedback filter 120, a balanced efficiency is greatly improved, even when the front portion of the D channel Brazilian broadcast signal includes a refractory having ghosting .

图7的流程图表示使用图4所示的信道均衡器来提高信道均衡效率的信道均衡方法。 FIG. 7 shows a flowchart of FIG channel equalizer 4 shown to improve the efficiency of channel equalization channel equalization method. 下面将忽略已经参考图4和图5说明过的图7的一些部分。 We will ignore some portions 4 and 5 have been described with reference to FIG. 7 to FIG.

首先,在操作S110中,前馈滤波器110从广播信号的各个符号中消除前重影,因而输出信号M。 First, in operation S110, a feedforward filter 110 to eliminate ghosts from the front of each symbol of the broadcast signal, so the output signal M. 在操作S120中,反馈滤波器120从广播信号的各个符号中消除后重影,因而输出信号L。 In operation S120, the feedback filter 120 to eliminate post-ghost respective symbol from a broadcast signal, and thus the output signal L.

在操作S130中,加法器130将已经消除前重影并且从前馈滤波器110输出的信号M,以及已经消除了后重影并且从反馈滤波器120输出的信号L相加,因而输出总和信号(结果值)Y。 In operation S130, the adder 130 has been eliminated and the ghost before the feedforward filter output signal M 110, and has been eliminated from the post-ghost signal L 120 and the added feedback filter output, so the output sum signal ( result value) Y. 在操作140中,网格解码器140对加法器130的总和信号Y进行网格解码。 In operation 140, trellis decoder 140 the sum signal Y of the adder 130 is trellis decoded.

在操作S150中,级别判决单元150确定加法器130的总和信号Y在预定级别当中最近级别的级别。 In operation S150, the level decision unit 150 determines the level of sum signal Y of the adder 130 at the most recent level among a predetermined level. 因此,级别判决单元150向反馈滤波器120和误差计算器160提供所确定级别的信号D。 Therefore, the level decision unit 150 provides a signal to a level determined by the feedback filter 120 and error calculator 160 D. 在操作S160中,依据预定的误差更新算法,误差计算器160计算误差值E,即加法器130的总和信号Y和级别判决单元150的所确定的级别数据D之间的差。 In operation S160, the update error based on a predetermined algorithm, the error calculator 160 calculates an error value E, i.e. the difference between the level data of the adder sum signal Y and the level decision unit 130 determines 150 D. 误差计算器160向前馈滤波器110、反馈滤波器120和网格控制单元170提供计算出的误差值E。 Error calculator 160 feed forward filter 110, feedback filter 170 provides the calculated error value 120 and control grid unit E. 前馈滤波器110和反馈滤波器120根据由误差计算器160提供的误差值E来更新系数。 Feedforward filter 110 and feedback filter 120 to update the coefficients according to the error value E supplied from the error calculator 160.

同时,在操作S170中,根据由误差计算器160提供的误差值E,网格控制单元170控制何时网格解码器140的网格解码数据被输入到反馈滤波器120的时间点。 Meanwhile, in operation S170, based on the error value E supplied from the error calculator 160, the control unit 170 controls the grid when the trellis decoder trellis decoding data 140 is input to the timing of the feedback filter 120. 当与由误差计算器160获得的误差值E相应的SNR等于或大于预定的阈值时,在操作S170中网格控制单元170控制网格解码器140向反馈滤波器120输入解码的数据。 When the SNR is equal to or greater than a corresponding predetermined threshold value and an error value E obtained by the error calculator 160, the operation data 120 input to the decoding unit 170 controls the feedback filter trellis decoder 140 S170 the grid control.

因此,根据从级别判决单元150反馈的确定级别数据而执行后重影消除滤波的反馈滤波器120,根据从网格解码器140接收的解码数据执行各个符号的后重影消除。 Thus, the determination is performed in accordance with the level of data fed from the level decision unit 150 ghost cancellation filter from a feedback filter 120, according to the ghost elimination performed each symbol trellis decoder 140 decodes the data received from.

因此,通过避免由于级别判决单元的误差而在反馈滤波器中出现的误差传播,信道均衡器的均衡性能就被加强了。 Thus, by avoiding errors due to error propagation level decision unit that occurs in the feedback filter, the equalization performance of the channel equalizer can be enhanced.

根据本发明,即使当与在误差计算器中得到的误差值相应的SNR等于或大于预定的阈值时,由于级别判决单元的错误级别确定而产生的均衡效率的下降,通过反馈滤波器根据从网格解码器输入的解码数据而执行滤波被避免了。 According to the present invention, even when the error value in the error calculator obtained corresponding SNR equal to or greater than a predetermined threshold value, the efficiency decreases because equilibrium level decision error level determination unit generated by the network according to the feedback filter decoded data cell decoder performs input filtering is avoided.

虽然上面已经说明了本发明的实施例,但是本专业的普通技术人员将会明白,本发明不应该局限于所说明的优选实施例,并且在附加权利要求书及其等同所定义的精神和范围内可以做各种各样的变化和修改。 While the above described embodiments of the present invention, those of ordinary skill in the art will appreciate that the present invention should not be limited to the preferred embodiments illustrated embodiment, the appended claims and their equivalents from the spirit and scope of the defined It can be done within a wide range of changes and modifications.

本申请要求2002年9月19日在韩国知识产权局提交的韩国专利申请号2002-57399的专利申请中的利益,该专利申请的说明包含于此以作参考。 This application claims the Korean Patent Office No. 2002-57399 filed the interests of patent applications in the September 19, 2002, indicating that the patent application is incorporated herein by reference.

Claims (26)

1.一种接收输入信号的单载波接收机的信道均衡器,包括:前馈滤波器,消除输入信号各个符号的前重影;反馈滤波器,消除输入信号各个符号的后重影;加法器,结合消除了前重影的符号和消除了后重影的符号,所述结合符号被输出;级别判决单元,参考预定级别的数据,确定在加法器中相加的符号级别,并将所确定的级别反馈到反馈滤波器中;网格解码器,对加法器中得到的符号总和执行网格解码;误差计算器,计算在加法器中得到的符号和在级别判决单元中所确定级别之间的误差值;网格控制单元,控制网格解码器,以便当相应于在误差计算器中得到所述误差值的信噪比(SNR)等于或大于预定的阈值时,将网格解码器中输出的多个解码符号输入到反馈滤波器中。 A single carrier receiver receiving an input signal channel equalizer, comprising: a feedforward filter to eliminate ghosts before each symbol of the input signal; a feedback filter, after the elimination of ghost of the input signal for each symbol; adder , eliminating the combined symbol before and eliminating ghost ghost symbols, the symbols are combined output; level decision means, the predetermined reference level data to determine the level of symbols added in an adder, and the determined level is fed back to the feedback filter; trellis decoder, the trellis decoder performs the symbol sum obtained in the adder; error calculator for calculating the symbol obtained between the adder and the decision unit at the level determined level error value; mesh control unit controlling the trellis decoder, such that when the obtained error value corresponding to the error in the signal to noise ratio calculator (SNR) is equal to or greater than a predetermined threshold value, the trellis decoder in a plurality of decoded symbol output from the input to the feedback filter.
2.如权利要求1的信道均衡器,其中,网格解码器包括:总解码深度为N(N=自然数);追溯延迟的总长度为N×K(K=自然数)。 2. The channel equalizer of claim 1, wherein the trellis decoder comprising: a decoding depth of a total N (N = a natural number); the total length of the delay is traced N × K (K = a natural number).
3.如权利要求2的信道均衡器,其中,网格解码器将解码符号输入到反馈滤波器中,这些解码符号是从总解码深度的多个解码深度状态输出的。 3. The channel equalizer of claim 2, wherein the trellis decoder decodes the input symbol to the feedback filter, the decoded symbols are output from the plurality of decoded state total depth of the decoded depth.
4.如权利要求3的信道均衡器,其中,从解码深度状态n(n≤N,N=自然数)输出的解码符号被输入到反馈滤波器的第1+(n×K)个滤波器抽头中,并且,从解码深度状态输出的解码符号被分别输入到反馈滤波器的相应滤波器抽头中。 4. The channel equalizer of claim 3, wherein the depth from the decoding state n (n≤N, N = natural number) symbols decoded output is input to a feedback filter section 1+ (n × K) filter taps , and, from the state of the output decoded symbol decoding depth are input to respective filter taps of the feedback filter.
5.如权利要求1的信道均衡器,其中,利用在级别判决单元中所确定的级别输入,反馈滤波器根据所判决的级别从各个符号中消除后重影,并且利用来自网格解码器的解码符号的另一个输入,反馈滤波器根据解码符号从各个符号中消除后重影。 5. The channel equalizer of claim 1, wherein, using the input level at the level determined in the decision unit, the feedback filter removes post-ghost from the respective symbols according to the level of the decision, and from the use of trellis decoder another input to the decoding of the symbol, the feedback filter removes post-ghost from the respective symbols according to the decoded symbol.
6.接收输入信号的单载波接收机的信道均衡方法,包括:使用前馈滤波器从输入信号的各个符号中消除前重影;使用反馈滤波器从输入信号的各个符号中消除后重影;结合消除了前重影的符号和消除了后重影的符号,所述结合符号被输出;执行反馈操作,该反馈操作参考预定级别的数据确定作为相应级别的符号总和,并且向反馈滤波器输入所确定的级别;根据预定的误差更新算法,计算符号总和及所确定的相应级别之间的误差;执行网格解码操作,该网格解码操作利用网格解码器对这些符号执行网格解码;控制网格解码器,以便在相应于误差值的信噪比等于或大于预定的阈值时,将解码符号从网格解码器输入到反馈滤波器中。 6. The method of channel equalization single carrier receiver receiving an input signal, comprising: a feedforward filter used to eliminate ghost from the front of each symbol of the input signal; a feedback filter is used to eliminate post-ghost respective symbol from the input signal; combined symbol eliminating ghosting front ghost elimination of symbols and the symbols are combined output; feedback operation is performed, the predetermined reference level feedback operation is determined as the sum of the data symbol corresponding level, and input to the feedback filter the determined level; update error according to a predetermined algorithm to calculate the sum of errors between the symbols and the corresponding determined level; perform trellis decoding operation, the trellis decoding operation performed by using a trellis decoder decodes the symbols on the grid; control trellis decoder, greater than or equal to a predetermined threshold value corresponding to the SNR error value, the decoded symbols from the trellis decoder are input to the feedback filter.
7.如权利要求6的信道均衡方法,其中,在网格解码操作中的网格解码器包括:总解码深度为N(N=自然数);追溯延迟的总长度为N×K(K=自然数)。 7. The channel equalization method of claim 6, wherein the trellis decoder in the trellis decoding operation comprises: a total decoding depth of N (N = a natural number); the total length of the traced delay of N × K (K = a natural number ).
8.如权利要求7的信道均衡方法,其中网格解码器将解码符号输入到反馈滤波器中,这些解码符号是从总解码深度的多个解码深度状态中输出的。 8. The method of channel equalization as claimed in claim 7, wherein the trellis decoder decodes the input symbol to the feedback filter, the decoded symbols are output from the plurality of decoding the decoding depth of the status of the total depth.
9.如权利要求8的信道均衡方法,其中从解码深度状态n,n等于或小于N,输出的解码符号被输入到反馈滤波器的第1+(n×K)个滤波器抽头中,并且从解码深度状态输出的解码符号被分别输入到反馈滤波器的相应滤波器抽头中。 9. The method of channel equalization as claimed in claim 8, wherein the decoding depth from the state n, n is equal to or smaller than N, the decoded symbol is input to the second output of the feedback filter 1+ (n × K) filter taps, and from the decoding state of the output symbol decoding depth are input to respective filter taps of the feedback filter.
10.如权利要求8的信道均衡方法,其中,反馈滤波器根据所判决的级别从各个符号中消除后重影,并且,根据来自网格解码器的解码符号的输入,根据解码符号从各个符号中消除后重影。 10. The method of channel equalization as claimed in claim 8, wherein the feedback filter of the decision level according to eliminate from the respective post-ghost symbol, and, based on the input decoded symbols from the trellis decoder, in accordance with the decoded symbols from each symbol after eliminating ghosting.
11.接收输入信号的单载波接收机,包括:恢复单元,用于从输入信号中恢复原始信号;相位恢复单元,用于恢复输入信号的相位失真;信道均衡器,用于以网格解码深度为单位,利用解码符号对恢复了相位失真的输入信号执行信道均衡;去交织器,用于对来自信道均衡器的信道均衡后的输入信号执行去交织;里德-所罗门解调器,用于对去交织后的输入信号执行里德-所罗门解码;其中信道均衡器包括:前馈滤波器,消除输入信号各个符号的前重影;反馈滤波器,消除输入信号各个符号的后重影;加法器,结合消除了前重影的符号和消除了后重影的符号,所述结合符号被输出;级别判决单元,参考预定级别的数据,确定在加法器中相加的符号级别,并将所确定的级别反馈到反馈滤波器中;网格解码器,对加法器中得到的符号总和执行网格解码;误差 11. The single carrier receiver receiving an input signal, comprising: recovery means for recovering the original signal from the input signal; a phase recovery unit configured to recover the input signal phase distortion; channel equalizer used in trellis decoding depth as a unit, using the decoded symbols to restore the phase distortion of the input signal to perform channel equalization; deinterleaver, performs an input signal from the channel after the channel equalizer equalizing deinterleaving; Reed - Solomon demodulator for interleaving the input signal to perform a Reed - Solomon decoding; wherein the channel equalizer comprises: a feedforward filter to eliminate ghosts before each symbol of the input signal; a feedback filter, after the elimination of ghost of the input signal of each symbol; the addition , a combined symbol eliminating ghosting front ghost elimination of symbols and the symbols are combined output; level decision means, the predetermined reference level data to determine the level of symbols added in an adder, and the determining the level of feedback to the feedback filter; a trellis decoder, symbol sum obtained in the adder performing trellis decoding; error 算器,计算在加法器中得到的符号和在级别判决单元中所确定级别之间的误差值;网格控制单元,控制网格解码器,以便根据在误差计算器中得到的误差值,将网格解码器中输出的多个解码符号输入到反馈滤波器中。 Calculator, calculates an error value between the symbol obtained in the adder and the decision unit at the level determined level; mesh control unit controlling the trellis decoder, in order to obtain error values ​​in the error calculator according to the a plurality of trellis decoder in decoding symbols output from the input to the feedback filter.
12.如权利要求11的单载波接收机,其中恢复单元包括:解调器,用于将输入信号转换为基带带宽;失真补偿单元,用于恢复段同步信号、场同步信号以及基带带宽中输入信号符号时序至少其中之一的失真;梳状滤波器,从恢复了失真的输入信号中消除NTSC(国家电视系统委员会)干扰信号。 12. The single carrier receiver as claimed in claim 11, wherein the recovery unit comprises: a demodulator for converting the input signal into a base band bandwidth; distortion compensation unit, for recovering segment sync signal, vertical sync signal and the baseband bandwidth input symbol timing signals wherein at least one of distortion; comb filter, to eliminate the NTSC (national television system Committee) signal interference recovery from distortion in the input signal.
13.如权利要求11的单载波接收机,其中网格解码器包括:总解码深度为N(N=自然数);追溯延迟的总长度为N×K(K=自然数)。 13. The single carrier receiver as claimed in claim 11, wherein the trellis decoder comprising: a decoding depth of a total N (N = a natural number); the total length of the delay is traced N × K (K = a natural number).
14.如权利要求13的单载波接收机,其中,网格解码器将解码符号输入到反馈滤波器中,这些解码符号是从总解码深度的多个解码深度状态输出的。 14. The single carrier receiver as claimed in claim 13, wherein the trellis decoder decodes the input symbol to the feedback filter, the decoded symbols are output from the plurality of decoded state total depth of the decoded depth.
15.如权利要求11的单载波接收机,其中,当相应于所述误差的信噪比等于或大于预定的阈值时,网格控制单元控制网格解码器将从网格解码器输出的解码符号输入到反馈滤波器中。 15. The single carrier receiver decoder of claim 11, wherein, when said error signal to noise ratio corresponding to greater than or equal to a predetermined threshold value, the control unit controls the grid from the decoder trellis decoder output mesh symbol input to the feedback filter.
16.如权利要求15的单载波接收机,其中从解码深度状态n,(n≤N,N=自然数)输出的解码符号被输入到反馈滤波器的第1+(n×K)个滤波器抽头中,并且从解码深度状态输出的解码符号被分别输入到反馈滤波器的相应滤波器抽头中。 Of 1+ (n × K) 16. The single carrier receiver as claimed in claim 15, wherein the decoding depth from the state n, (n≤N, N = natural number) symbols decoded output is input to the feedback filter of filter tap, and are input from the decoding state of the output symbol decoding depth corresponding to filter taps in the feedback filter.
17.如权利要求11的单载波接收机,其中,根据在级别判决单元中所确定的确定级别的输入,反馈滤波器根据所确定级别从各个符号中消除后重影,并且根据来自网格解码器的解码符号的另一个输入,反馈滤波器根据解码符号从各个符号中消除后重影。 17. The single carrier receiver as claimed in claim 11, wherein the level determined in accordance with the input level as determined by the decision unit, the feedback filter removes post-ghost from the respective symbols according to the determined level, from the trellis decoder and according to the other input of the decoder's symbol, the feedback filter removes post-ghost from the respective symbols according to the decoded symbol.
18.一种接收输入信号的单载波接收机,包括:信道均衡器,消除输入信号的各个符号的前重影和后重影,以及根据预定的级别数据和输入信号消除了前重影和后重影的符号之总和,对输入信号消除了前重影和后重影的符号之总和进行网格解码;其中信道均衡器包括:反馈滤波器,用于从输入信号的各个符号中消除后重影;前馈滤波器,用于从输入信号的各个符号中消除前重影;级别判决单元,根据预定级别的数据确定符号的级别,并将所确定的级别反馈到反馈滤波器中,其中级别判决单元根据预定级别的数据确定消除了前重影和后重影的符号的级别,所述反馈滤波器根据所确定的级别输出消除了前重影的符号;误差计算器,用于计算所确定级别以及输入信号的消除了前重影和后重影的符号之总和之间的误差值;网格解码器,用于根据误差计算器的 18. A single carrier receiver receiving an input signal, comprising: a channel equalizer, each symbol of the input signal to eliminate the ghost and the pre ghost, the ghost and the elimination of the front and rear in accordance with a predetermined level and the data input signal the sign of the sum of the ghost, the input signal prior to eliminating the sum symbol ghost and post-ghost performs trellis decoding; wherein the channel equalizer comprising: a feedback filter for eliminating the signals from the respective input symbols heavy Movies; feedforward filter for removing ghost from the front of each symbol of the input signal; level decision unit determines the level of the symbol data according to a predetermined level, and the determined level of feedback to the feedback filter, wherein the level of the decision unit determines the predetermined levels of data level before eliminates ghost and post-ghost symbols, the feedback filter eliminates the ghost before the symbol based on the determined level of the output; an error calculator for calculating the determined and an input signal level to eliminate the error between the sum of the first ghost and the post-ghost symbols; trellis decoder, according to the error calculator 差值,对输入信号的消除了前重影和后重影的符号之总和进行网格解码;控制器,用于控制网格解码器以向反馈滤波器中传输输入信号的消除了前重影和后重影的符号之解码总和。 Difference sum before the elimination of ghost and post-ghost symbol of trellis decoding input signal; and a controller for controlling the trellis decoder to eliminate the ghost before the transmission of the feedback filter input signal and decoding the post-ghost sum of symbols.
19.如权利要求18的单载波接收机,其中反馈滤波器根据解码总和来消除输入信号的后重影符号。 19. The single carrier receiver as claimed in claim 18, wherein the feedback filter to eliminate the ghost symbol decoding according to the sum of the input signal.
20.如权利要求18的单载波接收机,其中信道均衡器向反馈滤波器中传输输入信号消除了前重影和后重影的符号之解码总和。 20. The single carrier receiver as claimed in claim 18, wherein the channel equalizer eliminated before decoding sum ghost and post-ghost of symbols transmitted to the feedback filter input signal.
21.如权利要求20的单载波接收机,其中信道均衡器根据误差值产生输入信号的消除了后重影的符号。 21. The single carrier receiver as claimed in claim 20, wherein the channel equalizer generates symbol after eliminating ghost input signal according to the error value.
22.如权利要求20的单载波接收机,其中信道均衡器根据输入信号的消除了前重影和后重影的符号之解码总和,产生输入信号的消除了后重影的符号。 22. The single carrier receiver 20, wherein the channel equalizer eliminates sum of symbols before decoding ghost and post-ghost of the input signal, is generated after eliminating ghost signal input symbols according to requirements.
23.如权利要求18的单载波接收机,其中信道均衡器向反馈滤波器传输输入信号之解码符号,以便反馈滤波器根据解码之总和消除输入信号的符号后重影。 23. The single carrier receiver as claimed in claim 18, wherein the channel equalizer feedback filter to the decoded symbol transmit the input signals to the feedback filter removes post-ghost signal input symbols based on the sum of the decoding.
24.一种对单载波接收机中输入信号的符号执行信道均衡的方法,该方法包括:消除输入信号各个符号的前重影和后重影;根据预定级别的数据和输入信号的消除了前重影和后重影的符号之总和对输入信号的消除了前重影和后重影的符号之总和进行网格解码;其中对输入信号的消除了前重影和后重影的符号之总和进行网格解码包括:根据预定级别的数据确定所述总和的级别;将所确定的级别反馈到反馈滤波器中。 The method of performing channel equalization symbol 24. A single carrier input signal receiver, the method comprising: an input signal to eliminate the respective symbols have the ghost and post-ghost; eliminated before the predetermined level according to the data input signal and the sum of the symbol ghost and post-ghost elimination of the sum of the previous ghost and post-ghost of the input symbol trellis decoded signal; wherein the input signal is eliminated and the sum of the previous post-ghost of a ghost symbol trellis decoding comprises: determining a level of the sum of the data according to a predetermined level; the determined level is fed back to the feedback filter.
25.如权利要求24的方法,其中消除输入信号的各个符号的后重影包括:根据所确定级别输出消除了后重影的符号。 Postghosts 25. The method of claim 24, wherein each symbol of the input signal elimination comprises: according to the determined output level after eliminating ghost symbols.
26.如权利要求24的方法,其中对输入信号的消除了前重影和后重影的符号之总和进行网格解码包括:根据所述确定值以及输入信号的消除了前重影和后重影的符号之总和之间的误差值,向反馈滤波器传输输入信号的消除了前重影和后重影的符号之解码总和。 26. The method of claim 24, wherein the input signal is eliminated and the sum of the previous post-ghost of a ghost symbol trellis decoding comprises: determining based on the input signal value, and eliminates the front and rear weight ghosts Movies error value between the sum of the symbol, the sum is eliminated before decoding ghost and post-ghost transmitted symbols of the input signal to the feedback filter.
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