CN100486235C - Iterative receiving method for maintaining soft information - Google Patents

Iterative receiving method for maintaining soft information Download PDF

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CN100486235C
CN100486235C CN 200510040005 CN200510040005A CN100486235C CN 100486235 C CN100486235 C CN 100486235C CN 200510040005 CN200510040005 CN 200510040005 CN 200510040005 A CN200510040005 A CN 200510040005A CN 100486235 C CN100486235 C CN 100486235C
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decoding
decoder
iterative
soft information
soft
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CN1694439A (en
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尤肖虎
王闻今
高西奇
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东南大学
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Abstract

软信息保留的迭代检测译码方法涉及一种通过使用多个发送/接收天线来传输高速数据的宽带移动通信系统,所述的用于编码的通信传输系统的迭代检测译码方法是软信息保留的迭代译码方法,即在每次检测译码中的迭代译码后保存了译码器内部交互的软信息,交互的软信息在下次检测译码迭代中给译码器做初始化。 Detecting soft information retaining iterative decoding method relates to a broadband mobile communication system for high-speed data transmission by using a plurality of transmission / reception antenna, detecting the iterative decoding method for encoding a communication information transmission system soft reserved the iterative decoding method, that is, save the soft information inside interactive decoder after decoding iterative decoding each test, the interaction of soft information to the decoder to do the initial detection decoding in the next iteration. 译码的输出包括三部分,第一部分是用来判决的输出,通常在最后一次译码中才输出;第二部分是每次检测译码迭代需要输出给检测的比特似然比,用来给检测提供先验信息;第三部分为每次检测译码的迭代译码中分量译码器之间交互的软信息或者不同校验约束之间的软信息。 Decoded output includes three parts, the first part is used to output decision, usually only the final decoding output; the second portion is detected each decoding iteration needs to be output to the likelihood ratio detected bits, used to providing a priori information is detected; soft information between a third part of the information interaction between the soft iterative decoding each detected component decoders for decoding the checksum constraints or different.

Description

软信息保留的迭代接收方法 Iterative method for receiving information soft reserved

技术领域 FIELD

本发明涉及一种通过使用多个发送/接收天线来传输高速数据的宽带移动通信系统,尤其涉及一种用于无线通信系统接收端的无线信号处理方法。 The present invention relates to a use of a plurality of transmitting / receiving antennas to transmit high-speed data broadband mobile communication system, and particularly to radio signal processing method for a wireless communication system receiver.

背景技术 Background technique

无线信道存在着较为严重的时间和频率选择性衰落,尤其在多天线无线系统中,在接收端不仅存在着符号间干扰,而且存在着天线之间的干扰。 There is a more serious radio channel time and frequency selective fading, particularly in a multiple antenna wireless system, there are not only at the receiving end of intersymbol interference, and there is interference between the antennas. 而为了抵抗信道衰落和噪声,通常在无线通信系统中会采用差错控制编码技术,而符号间干扰和天线间干扰通常用检测器去除。 To combat the noise channel and the fading will typically employ error control coding technique in a wireless communication system, the inter-symbol interference and inter-antenna interference is usually removed with a detector. 迭代检测译码技术的原理是在检测时使用译码器反馈的软信息,从而得到更优的检测结果,而更优的检测结果通过译码又能得到更优的译码输出。 Iterative decoding techniques detection principle is used in detecting soft information decoder feedback, resulting in better detection result, and the better the detection result obtained by the decoding can better decode output. 如此反复迭代,不断逼近最优解。 Iteratively repeated closer and closer to the optimal solution. 迭代检测译码方法能够大大地提高接收机的性能,即能够在维持相同频率效率的情况下提髙功率效率或者在维持相同功率效率的情况下利用高阶调制提高频谱效率。 Iterative Detection and Decoding method can greatly improve the performance of the receiver, i.e., Gao possible to improve the power efficiency while maintaining the same frequency or with a high-order modulation efficiency improving spectral efficiency while maintaining the same power efficiency.

级联码和基于图的码都是髙性能的差错控制编码方式,前者如Turbo码, 后者如LDPC码,都是使用迭代译码的方法进行译码。 FIG concatenated code and a code-based error control performance is Gao encoding, such as Turbo code former, which, as LDPC codes are decoded using an iterative decoding method. 级联码的译码用turbo 译码原理,在不同的分量译码器之间交互软信息,多次迭代逼近最优译码,每个分量译码器都是使用软输入软输出的最大似然或准最大似然译码算法。 Decoding concatenated code with turbo decoding principle, soft information interaction between the different components of the decoder, the best approximation of decoding a plurality of iterations, each component decoder is a soft input soft output Maximum Likelihood natural or quasi-maximum likelihood decoding algorithm. 而LDPC码的译码则是使用可信度传播算法,利用在不同的约束关系之间交互信息,多次迭代提高性能。 And decoding the LDPC code belief propagation algorithm is used, the use of mutual information between different constraints, multiple iterations to improve performance. 但是使用高性能差错控制编码诸如Turbo码,LDPC 码等通信系统,如果在接收端使用迭代检测译码,会增加接收机的复杂度。 However, using a high performance error control coding Turbo code, the LDPC code communication system such as, if the complexity of the receiving end iterative decoding is detected, the receiver will increase. 比如通常Turbo码译码通常需要4〜8次迭代收敛到较好的性能,而迭代检测译码如果使用4次迭代检测,则一共需要16〜32次turbo迭代译码,复杂度过髙导致难以实现。 Typically such Turbo Decoding generally requires 4 to 8 iterations converge to a better performance, if the use of iterative detection decoding iterations detector 4, the total time required 16~32 turbo iterative decoding complexity makes it difficult to spend Gao achieve.

3发明内容 3 SUMMARY OF THE INVENTION

技术问题:本发明的目的是提供一种软信息保留的迭代接收放法,大大地减少每次检测译码迭代中译码所需要的迭代次数,有效地降低接收机的复杂度。 Technical problem: The purpose of the present invention to provide an iterative soft information retaining receiving discharge method greatly reduces the number of iterative decoding iteration decoding each test required to effectively reduce the complexity of the receiver.

技术方案:本发明所涉及的无线通信系统具有一个或一个以上的接收天线和一个或一个以上的发送天线,发送端采用Turbo码、LDPC码等级联码或者基于图的差错控制编码,接收机使用迭代检测译码,其中译码器使用迭代译码的方法。 Technical Solution: The wireless communication system according to the present invention having one or more receiving antennas and one or more transmission antennas, the transmitting end with Turbo code, the LDPC code with code or a control coding level based on the error map, the receiver uses iterative detection and decoding in which method the decoder using iterative decoding. 本发明在迭代检测译码方法中,在每次检测译码的译码结束后保留了分量译码器之间的交互软信息,或者不同约束之间的交互软信息,大大降低了每次检测译码迭代的译码器迭代次数。 In the present invention, the iterative detection decoding method, after each detection of a decoder for decoding soft information retained interaction between the components of the decoder, the soft information or interaction between the different constraints, each detection greatly reduced decoding iterative decoder iterations.

本发明所述的迭代检测译码接收方法的实现装置主要可以分为软输入软输出检测器,交织和反交织器,软输入软输出译码器等几部分。 Iterative decoding detecting device for implementing the reception method according to the present invention can be divided into soft-input soft-output detector, and a de-interleaving interleaved several parts, a Soft Input Soft Output decoder like.

1、 软输入软输出检测器可以采用任意软输入软输出检测方法。 1, the soft input soft output detector may be arbitrarily input soft output detection method employed. 比如单天线或者多天线系统中的使用先验信息的MMSE检测器,MAP检测器,迭代软干扰抵消检测等等。 Such as single antenna or multiple antenna system using a priori information MMSE detector, the MAP detector, the soft iterative interference cancellation detection and the like.

2、 反交织器把检测得到的比特似然比排成译码器的顺序。 2, the detected anti-interleaver obtained bit likelihood ratio sequence aligned decoder. 而交织器把译码器输出的似然比重新按照检测器的要求排列。 The interleaver rearranges the likelihood ratio output from the decoder according to the requirements of the detector.

3、 译码器把反交织后的比特似然比按照编码块根据编码器的约束进行译码,得到新的译码后的似然比,在非末次迭代中将其反饿给检测器,而在末次迭代中将用于信息比特的判决。 3, the decoder de-interleaving the bit log likelihood ratio according to the coding block is decoded according to the constraints of the encoder, to obtain likelihood ratio, which anti-hunger to the detector in a non-last iteration the new coding, and in the last iteration for the bit decision information. 在本发明中使用的Turbo码,LDPC码等需要迭代译码的译码器,我们在每次译码后保留了迭代译码的中间信息,用来在下一次检测译码迭代中给译码器做初始化。 Turbo codes used in the present invention, the LDPC codes requires an iterative decoder for decoding, we have retained intermediate information iterative decoding after each decoding for the next iteration of the detection decoding to the decoder do initialization.

具体方法如下: Specific methods are as follows:

所述的用于编码的通信传输系统的迭代检测译码方法是软信息保留的迭代译码方法,即在每次检测译码中的迭代译码后保存了译码器内部交互的软信息,交互的软信息在下次检测译码迭代中给译码器做初始化。 Iterative detection decoding method for encoding a communication information transmission system to retain soft iterative decoding method, that is, after each iterative decoding in the decoding detecting soft information stored inside the interaction decoder, soft information exchange in the next iteration to detect decoding decoder to do initialization.

译码的输出包括三部分,第一部分是用来判决的输出,通常在最后一次译码中才输出:第二部分是每次检测译码迭代需要输出给检测的比特似然比,用来给检测提供先验信息;第三部分为每次检测译码的迭代译码中分量译码器之间交互的软信息或者不同校验约束之间的软信息。 Decoded output includes three parts, the first part is used to output decision, usually only the final decoding output: detecting each second portion is output to the decoding iteration requires detection bit likelihood ratio, used to providing a priori information is detected; soft information between a third part of the information interaction between the soft iterative decoding each detected component decoders for decoding the checksum constraints or different.

当编码采用并行级联巻积码,其译码方法包含以下步骤: When using the parallel concatenated coding convolving code, which decoding method comprising the steps of:

3.1) 在每次译码器迭代译码时,两个分量译码器之间互相交互软信息; 3.1) at each decoder iterative decoding, soft information interaction between the two components to each other decoders;

3.2) 在译码器迭代译码结束后,将最后一次译码迭代第二个分量译码器 3.2) after the iterative decoder decodes the last decoding iteration second component decoder

给第一个分量译码器的软信息保留; Component to the first soft decoder information retention;

3.3) 在下一次检测器同译码器之间的迭代中,在译码器开始检测时,第—个分量译码器用步骤3.2)中保留的软信息做初始化; Next iteration between the detector decoder with 3.3), when the decoder starts to detect, - of Used component decoding step 3.2) retained in the soft information to do initialization;

3.4) 最后一次检测器同译码器的之间的迭代结束时,译码器将判决输出。 3.4) at the end of the last iteration, the decoder outputs the decision between the detector with the decoder. 当编码采用低密度奇偶校验码LDPC,其步骤如下: When encoding using low density parity check code LDPC, the following steps:

4.1) 在每次译码器迭代译码时,在水平译码步骤和垂直译码步骤之间交互软信息, 4.1) at each decoding iteration decoder, between the horizontal and vertical decoding step decoding step soft information interaction,

4.2) 在译码器迭代译码结束后,将最后一次迭代译码的垂直译码步骤得到的软信息保留; 4.2) after the iterative decoder decodes the last iteration of decoding the soft information to obtain the vertical retention decoding step;

4.3) 在下一次检测器同译码器之间的迭代中,在译码器开始检测时,水平译码步骤用到步骤4. 3)中保留的软信息做初始化; Next iteration between the detector decoder with 4.3), when the decoder starts to detect the level decoding step is used in step 4.3) to make soft information retained initialization;

4.4) 最后一次检测器同译码器之间的迭代结束时,译码器将判决输出。 4.4) at the end of the last iteration, the decoder decision output between the detector with a decoder. 有益效果:同常规的Turbo迭代接收方法不同的是,本发明在每次检测译 Advantageous Effects: different methods with conventional iterative receiver Turbo is translated in the present invention each test

码迭代中迭代译码结束后保留了译码器的中间迭代信息,在下次检测译码迭代时将保留的软信息作为译码器的初始信息。 Iterative decoding retained after the end of the iteration the iterative decoder intermediate information, the soft information is detected next decoding iteration is retained as the initial information decoder. 本发明的优点在于充分利用了每次迭代译码的中间信息,将迭代检测译码同迭代译码本身结合起来,大大地减少了每次检测译码迭代中译码所需要的迭代次数,有效地降低了接收机的复杂度。 Full advantage of the present invention is that the use of iterative decoding intermediate information each time, combine the iterative decoding with the iterative decoding detector itself, greatly reducing the number of iterations in the iteration decoding each test required for decoding, effective It reduces the complexity of the receiver. 本发明提出的turbo迭代接收方法可以在每次检测译码迭代时有效地减少迭代译码的次数,也可以在保持复杂度一定的情况下提高系统的性能。 Iterative methods proposed turbo receiver of the present invention can effectively reduce the number of iterations of decoding detected at each decoding iteration, may improve system performance while maintaining a certain degree of complexity.

本发明提出的软信息保留的迭代检测译码接收机适合用在使用级联码或者LDPC码等差错控制编码,并且使用迭代译码的各类通信系统。 Soft information provided by the invention retain Iterative Detection and Decoding for use in a receiver using a concatenated code or LDPC code error control coding, and various types of communications systems using iterative decoding.

1. 不仅包括单天线系统,而且包括多天线系统。 1 includes not only a single antenna system, but also a multi-antenna system.

2. 该无线通信系统既可以为多载波传输,也可以为单载波传输。 2. The wireless communication system that can transmit multi-carrier, single carrier may also be transmitted.

3. 该无线通信系统既可以为扩频系统,也包括非扩频系统。 3. The wireless communication system is a spread spectrum system that can also include non-spread spectrum systems.

4. 多址方式可以为FDMA、 TDMA、 CDMA各种形式。 4. The multi-access mode can be FDMA, TDMA, CDMA various forms. 附图说明 BRIEF DESCRIPTION

图1是软信息保留的迭代接收机框图。 FIG. 1 is a block diagram illustrating an iterative receiver soft information retained.

图2是软信息保留的Turbo码译码框图。 FIG 2 is a block diagram of a Turbo Decoding soft information retained. 图3是软信息保留的LDPC (BP)译码器。 FIG 3 is a soft information retained LDPC (BP) decoder.

具体实施方式 Detailed ways

本发明的软信息保留的迭代检测译码方法中所述的用于编码的通信传输系统的迭代检测译码方法是软信息保留的迭代译码方法,即在每次检测译码中的迭代译码后保存了译码器内部交互的软信息,交互的软信息在下次检测译码迭代中给译码器做初始化。 Iterative Detection and Decoding of the present invention retain soft information in the method for Iterative Detection and Decoding Communication System encoding method is an iterative method for decoding the soft information is retained, i.e., the translation of each test iteration of the decoding after the code is stored inside a soft information decoder interaction, information exchange soft to do the initial detection decoder decodes the next iteration. 译码的输出包括三部分,第一部分是用来判决的输出,通常在最后一次译码中才输出;第二部分是每次检测译码迭代需要输出给检测的比特似然比,用来给检测提供先验信息;第三部分为每次检测译码的迭代译码中分量译码器之间交互的软信息或者不同校验约束之间的软信息。 Decoded output includes three parts, the first part is used to output decision, usually only the final decoding output; the second portion is detected each decoding iteration needs to be output to the likelihood ratio detected bits, used to providing a priori information is detected; soft information between a third part of the information interaction between the soft iterative decoding each detected component decoders for decoding the checksum constraints or different. 当编码采用并行级联巻积码,其译码方法包含以下步骤- When using the parallel concatenated coding convolving code decoding method which comprises the steps of -

3. 1)在每次译码器迭代译码时,两个分量译码器之间互相交互软信息; 3.1) at each decoder iterative decoding, soft information interaction between the two components to each other decoders;

3.2) 在译码器迭代译码结束后,将最后一次译码迭代第二个分量译码器给第一个分量译码器的软信息保留; 3.2) after the iterative decoder decodes the last decoding iteration second component to the first soft decoder information component decoder retained;

3.3) 在下一次检测器同译码器之间的迭代中,在译码器开始检测时,第一个分量译码器用步骤3.2)中保留的软信息做初始化; Next iteration between the detector decoder with 3.3), when the decoder starts to detect the first component decoder applications Step 3.2) to do soft information retained in the initialization;

3.4) 最后一次检测器同译码器的之间的迭代结束时,译码器将判决输出。 3.4) at the end of the last iteration, the decoder outputs the decision between the detector with the decoder. 当编码采用低密度奇偶校验码LDPC,其步骤如下: When encoding using low density parity check code LDPC, the following steps:

4.1) 在每次译码器迭代译码时,在水平译码步骤和垂直译码步骤之间交互软信息, 4.1) at each decoding iteration decoder, between the horizontal and vertical decoding step decoding step soft information interaction,

4.2) 在译码器迭代译码结束后,将最后一次迭代译码的垂直译码步骤得到的软信息保留; 4.2) after the iterative decoder decodes the last iteration of decoding the soft information to obtain the vertical retention decoding step;

4.3) 在下一次检测器同译码器之间的迭代中,在译码器开始检测时,水平译码步骤用到步骤4. 3)中保留的软信息做初始化; Next iteration between the detector decoder with 4.3), when the decoder starts to detect the level decoding step is used in step 4.3) to make soft information retained initialization;

4.4) 最后一次检测器同译码器之间的迭代结束时,译码器将判决输出。 4.4) at the end of the last iteration, the decoder decision output between the detector with a decoder. 现以BCJR算法译码的Turbo码和可信度传播译码的LDPC算法为本发明的两个实施例。 And Turbo codes is to belief propagation decoding algorithm for LDPC decoding BCJR algorithm of the present invention, two embodiments.

1、 Turbo码 1, Turbo code

Turbo码通常意义上指的是并行级联巻积码,在译码时采用BCJR算法对每个分量译码器进行软输入软输出译码,两个分量译码器之间互相迭代地交互软 Refers to a Turbo code is a parallel concatenated usual sense convolving code, soft input soft-output decoder decodes each component using the BCJR algorithm in decoding, the iterative decoder mutually between the two components to interact soft

信息,而译码器作为一个整体又同检测器之间互相的交互软信息。 Information, and the decoder as a whole and with mutual interaction between the detector soft information.

图2描述了本发明的一个实施例,软信息保留的Turbo码译码方法。 2 depicts one embodiment of the present invention, soft information retained Turbo decoding method embodiment. 图中 Figure

描述了一软信息保留的软输入软输出的Turbo译码。 Turbo decoding describes a soft input soft information retaining the output. 主要包含了两部分的输入 The main input contains two parts

和三部分输出。 And the output of three parts. 输入Zg表示第,'-l次检测译码迭代译码器保留的软信息;& Zg represents the input, '- l times detecting soft information decoder of the iterative decoder retained; &

表示第!'次检测译码迭代检测器或者解调器输出的似然比。 It represents! 'Determinations decoder iteration detector or demodulator output likelihood ratio. 输出I"表示第f次 Output I "for the first time f

检测译码迭代译码器最后输出的信息位比特的后验信息,可以用来做符号判决;4^表示第f次检测译码迭代译码器最后输出的编码比特的外信息,反馈 Posteriori information bits decoder detects the last iterative decoder outputs can be used to make symbol decisions; ^ 4 represents the outer encoded information bits of f-time detection decoder final output of the iterative decoder, the feedback

给检测器作为先验信息;为第f次检测译码迭代中迭代译码得到的译码器2 给译码器1的先验信息,在第"l次检测译码迭代中作为译码器1的先验信息。 As a priori information to the detector; iterative decoding obtained for the first decoder detects decoding iteration times f 2 a priori information to the decoder as the decoder of "l-time detection decoding iteration a priori information.

2、 LDPC码 2, LDPC codes

LDPC码,也就是低密度奇偶校验码,是基于奇偶校验图的一种编码方式。 The LDPC code, i.e. LDPC code, is based on a parity check encoding method of FIG. 通常用可信度传播(BP)算法来进行译码。 Usually belief propagation (BP) decoding algorithm. 设H为奇偶校验矩阵,则H的每—行均表示一种校验关系,每一列的1的个数表示该比特受校验约束的数目。 Let H be a parity check matrix, H is each - each row shows a calibration relationship, the number in each column represents the number of 1 bits by the parity constraints. 迭代译码分为两个部分,分别称为水平译码步骤和垂直译码步骤,水平译码步骤根据每一行的约束关系和其它比特的软信息计算出当前比特的软信息,而垂直译码步骤根据其它约束关系得到的软信息更新其当前约束关系的软信息,如图3所示: Iterative decoding is divided into two portions, respectively referred to as horizontal and vertical decoding step decoding step, the decoding step of calculating the level based on the soft information for each row constraints and other soft information bits of the current bit, and the vertical decoding to update the soft information according to its current constraints of soft information to other constraints obtained, shown in Figure 3:

同Turbo译码器相似,LDPC译码器同样具有两个输入和三个输出,《L表 Turbo decoder with similar, LDPC decoder also has two inputs and three outputs, "L table

示第!'-1次检测译码迭代时最后一次垂直译码步骤得到的第》个比特的除第m 个约束以外其它约束对产生的似然比。 Illustrates a first '-! Last obtained when vertical decoding step decoding iteration time detection section 1 "bits in addition to the m-th constraint other constraints likelihood ratio generated. ^表示检測器输出的编码比特的似然比。 ^ Detector output indicates a coding bit log likelihood ratio. 输出4^表示第f次检测译码迭代信息比特的后验似然比,4^表示第/次 Output 4 ^ f denotes the posterior of iteration decoding time detection likelihood ratio information bit, ^ represents 4 / time

检测译码迭代译码器编码比特的外信息,为第》'次检测译码迭代垂直译码 External information detecting iterative decoder decoding encoded bits, for the first ' "Iterative Detection and Decoding vertical decoding times

步骤所产生的软信息。 Soft information generated by the step.

Claims (3)

1、一种软信息保留的迭代检测译码方法,其特征在于所述的用于编码的通信传输系统的迭代检测译码方法是软信息保留的迭代译码方法,即在每次检测译码中的迭代译码后保存了译码器内部交互的软信息,交互的软信息在下次检测译码迭代中给译码器做初始化;译码的输出包括三部分,第一部分是用来判决的输出,通常在最后一次译码中才输出;第二部分是每次检测译码迭代需要输出给检测的比特似然比,用来给检测提供先验信息;第三部分为每次检测译码的迭代译码中分量译码器之间交互的软信息或者不同校验约束之间的软信息,保留后给下次迭代检测译码用。 A soft information retained iterative detection decoding method, wherein Iterative Detection and Decoding Communication System for the method of encoding information retention soft iterative decoding method, decoding of each test i.e. the iterative decoding after soft information saved inside the interaction decoder, the soft information to do the initial interaction of the decoder detects the next decoding iteration; decoded output includes three parts, the first part is used for judgment output, usually only the last decoding output; the second portion is detected each decoding iteration needs to be output to the likelihood ratio detected bits, used to provide prior information detected; third part each detection decoding soft information between the soft iterative decoding information in the interaction between the different components of the decoder or check constraint, retained after the decoding to detect the next iteration.
2、 根据权利要求1所述的软信息保留的迭代检测译码方法,其特征在于当编码采用并行级联巻积码,其译码方法包含以下步骤-3.1) 在每次译码器迭代译码时,两个分量译码器之间互相交互软信息;3.2) 在译码器迭代译码结束后,将最后一次译码迭代第二个分量译码器给第一个分量译码器的软信息保留;3.3) 在下一次检测器同译码器之间的迭代中,在译码器开始检测时,第一个分量译码器用步骤3.2)中保留的软信息做初始化;3.4) 最后一次检测器同译码器的之间的迭代结束时,译码器将判决输出。 2. The iterative decoding method of detecting soft information according to claim 1 retained, characterized in that when a parallel concatenated coding convolving code decoding method which comprises the steps of -3.1) in each decoder iteration translation time code, the interaction between the two components to each other soft information decoder; 3.2) after the iterative decoder decodes the last decoding iteration second component to the first component decoder decoder soft information is retained; the next iteration between the detector decoder with 3.3), when the decoder starts to detect the first component decoder applications step 3.2) to do soft information retained initialization; 3.4) last At the end of the iteration between the detector with the decoder, the decoder decision output.
3、 根据权利要求1所述的软信息保留的迭代检测译码方法,其特征在于当编码采用低密度奇偶校验码LDPC,其步骤如下:4.1) 在每次译码器迭代译码时,在水平译码步骤和垂直译码步骤之间交互软信息,4.2) 在译码器迭代译码结束后,将最后一次迭代译码的垂直译码步骤得到的软信息保留;4.3) 在下一次检测器同译码器之间的迭代中,在译码器开始检测时,水平译码步骤用到步骤4. 3)中保留的软信息做初始化;4.4) 最后一次检测器同译码器之间的迭代结束时,译码器将判决输出。 3. The iterative decoding method of detecting soft information according to claim 1 retained, characterized in that when encoding using the LDPC LDPC code, the following steps: 4.1) each time the iterative decoding when the decoder, between the horizontal and vertical decoding step decoding step soft information interaction, 4.2) in the iterative decoding after the decoder, the soft information retaining last iteration decoding step decoding perpendicular obtained; 4.3) detected the next between an iterator with the decoder, the decoder starts at the detection level decoding step is used in step 4.3) to make soft information retained initialization; between 4.4) with the last detector decoder at the end of the iteration, the decision output decoder.
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