CN1111990C - 使用基于信道特征的自适应编码的发射机方法和发射系统 - Google Patents

使用基于信道特征的自适应编码的发射机方法和发射系统 Download PDF

Info

Publication number
CN1111990C
CN1111990C CN97181998A CN97181998A CN1111990C CN 1111990 C CN1111990 C CN 1111990C CN 97181998 A CN97181998 A CN 97181998A CN 97181998 A CN97181998 A CN 97181998A CN 1111990 C CN1111990 C CN 1111990C
Authority
CN
China
Prior art keywords
code
channel
circuit
information
transmitter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN97181998A
Other languages
English (en)
Other versions
CN1249092A (zh
Inventor
P·W·登特
A·A·哈桑
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ericsson Inc
Original Assignee
Ericsson Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ericsson Inc filed Critical Ericsson Inc
Publication of CN1249092A publication Critical patent/CN1249092A/zh
Application granted granted Critical
Publication of CN1111990C publication Critical patent/CN1111990C/zh
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/09Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/29Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
    • H03M13/2906Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes using block codes
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/35Unequal or adaptive error protection, e.g. by providing a different level of protection according to significance of source information or by adapting the coding according to the change of transmission channel characteristics
    • H03M13/353Adaptation to the channel
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056Systems characterized by the type of code used
    • H04L1/0064Concatenated codes
    • H04L1/0065Serial concatenated codes
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/23Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using convolutional codes, e.g. unit memory codes
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/63Joint error correction and other techniques
    • H03M13/635Error control coding in combination with rate matching
    • H03M13/6356Error control coding in combination with rate matching by repetition or insertion of dummy data, i.e. rate reduction
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026Transmission of channel quality indication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/08Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system

Abstract

发射机(100)接收拟通过一个通信信道(101)发射给一个接收机(200)的信息。一个循环冗余校验(CRC)编码电路(106)利用为差错检测目的的CRC码编码该信息。该CRC编码的信息提供给一个代码开关(108)。该代码开关(108)提供该CRC编码的信息给第一代码电路(110)或第二代码电路(112)的任一个代码电路进行前向纠错(FEC)编码。第一代码电路(110)例如可以使用FEC码1例如卷积编码,编码该信息,而第二代码电路(112)可以使用FEC码2例如重复编码编码该信息。代码开关(108)根据检测到的信道(101)的特征选择第一或第二代码电路(110或112)之一。该信道特征可以从信道估计电路(114)得到,可以从来自接收机(200)的差错反馈信号I3得到或可以从二者的组合得到。在代码开关(108)选择第一或第二代码电路(110或112)之后,该信息被适当编码以便产生一个由发射电路(116)通过信道(101)发射的编码的信号。

Description

使用基于信道特征的自适应编码的发射机方法和发射系统
本发明涉及通过可以具有关于时间改变的特征的信道发射编码信号的发射机和方法,并且特别涉及发射机,发射系统和方法,其中充分连续地检测信道特征,基于该些特征选择一种编码技术并且以选择的编码技术对信号编码。
在目前的通信系统中,在系统的始发端(例如发射机)处理信息并且将信息变换为电信号。接着通过通信信道发射信号到系统的接收端(例如接收机)。接着该接收机处理该电信号并且将该信号变换回信息。大量的因素影响通信处理的速度,效率和可靠性。一个重要的因素是通信信道是否关于时间改变。如果发射机,接收机或两者都移动,则信道的特征特别易于改变。
在致力于减少由信道特征的改变引起的差错的过程中,电信号经常利用特殊的差错检测和校正信息编码。一个公知的差错检测技术的例子是循环冗余校验(CRC)码的使用。两个公知的差错校正(经常叫做前向纠错,或FEC)技术的例子是卷积码和重复码。大量的其他编码技术也是本领域公知的。为了便于描述和清楚,本发明将只使用CRC编码和FEC码技术描述。但是,本领域的技术人员将容易理解,在本发明中可以有利地采用任何公知的编码技术。
每种编码技术的性能水平取决于信道的特征。换句话说,一些编码技术在有噪声信道上执行得好,而其他技术在无噪声信道上执行得好。如上所述,遗憾地是,信道的特征可以关于时间改变,特别是在移动通信等等方面。已有的发射机在信息传输期间执行单一的预定编码技术。因此这些已有的发射机不能适应这些变化的信道特征,并且因此,其性能可能比最佳的、或所需的性能差一些。
相应地,在本领域需要用于发射信息的发射机、发射方法和系统,它检测信道的特征,基于检测到的信道特征选择适当的编码技术,使用选择的编码技术对信息编码并且发射编码的信息。
这种需要由根据本发明的发射机,发射系统和方法满足,其中监视信道的特征,其中基于监视的特征选择编码技术并且其中基于选择的编码技术对信息编码。
根据本发明的一个方面,发射机在源接口接收拟通过信道发射的信息。一个编码选择电路检测,或监视可能变化的信道的诸如噪声,干扰量等的特征。根据这些检测到的特征,编码选择电路选择适当的用于编码该信息的代码和相应地编码该信息。接着通过信道发射结果产生的编码信息。
代码选择电路可以具有第一和第二代码电路,用于分别或者以第一或者以第二代码编码信息。接着代码开关根据信道的特征选择一个代码电路。可以采用的两种示例性的编码是卷积码和重复码。另外,可以由循环冗余校验电路在发射前的信息上执行差错检测编码,例如循环冗余校验。为检测信道特征,信道估计电路可以估计信道的变化特征和/或表示可以从一个预期的接收机接收到的信道特征的反馈。
根据本发明的另一个方面,公开一种方法,用于通过信道发射编码的信号。该方法包括步骤:接收信息;检测信道的特征;根据确定的信道特征选择第一编码和第二编码之一;使用选择的第一和第二编码之一对信息信号编码以便产生编码的信号;和通过该信道发射该编码的信号。
在本发明的又另一方面,发射系统通过信道发射编码的信号,该信道可以具有关于时间改变的特征。发射机接收通过信道发射的信息。检测该信道的特征和根据信道特征编码信息以便产生编码的信号。接着由发射机通过信道发射这些编码的信号并且这些编码的信号由接收机接收。
本发明的这些和其他特征将从下面的详细描述,附图和所附的权利要求书中变得清楚。
图1是根据本发明的发射机的方框图;和
图2是根据本发明可以采用以便接收由图1所示的发射机发射的编码信号的一个示例性的接收机的方框图。
包括一个发射机100和一个接收机200的发射系统表示在图1和图2的方框图表中,该发射机和该接收机根据本发明的一个方面通过信道101通信。发射机100经信息接口103从信息源102接收信息信号,或信息序列。信息源102例如可以是一个计算机,一个传真机,一个语音编码器或产生信息序列的任意其他设备。由于本领域技术人员容易理解常规元件和电路的结构、控制和设计,在很大程度上,已经通过容易理解的方框表示和示意图在附图中说明,该方框表示和示意图仅示出与本发明有关的具体细节。以便不使本说明书所属领域的技术人员容易清楚的结构细节造成公开内容模糊不清。
代码选择电路104接收信息信号和适当编码发射给接收机200的信息信号。已经开发了各种编码技术,或类型以便保证信息信号的准确发射和接收。每种已知的编码技术具有各种优点和缺点并且或多或少确实取决于传输发生的信道的特征。遗憾地,信道的特征可以关于时间,特别是在移动通信等方面改变。因为以前的发射机使用一种预定的编码技术编码信息信号,可以使用比对于某些信道特征并非最佳的编码技术进行发射。因此,使用已有发射机的发射系统的性能可能比所需的性能差。
本发明的代码选择电路104通过在发射期间根据信道101的确定特征动态选择一种编码技术克服了已有发射机中的这个缺陷。循环冗余校验(CRC)电路106可以利用CRC代码编码该信息信号。CRC电路106将该信息信号的每k个码元编码为CRC代码的n个码元。在CRC过程期间增加的n-k个码元叫做奇偶校验码元。根据在CRC电路106输入端的k个码元的特定块确定这些奇偶校验码元。下面将结合接收机200讨论,在解码处理期间使用CRC代码以便检测到纠错编码何时失败。因为CRC编码方法是本领域公知的,所以不在下文另外描述。
来自CRC电路106的CRC编码信息信号发射到一个代码开关108,它选择第一代码电路110或第二代码电路112用于CRC编码信息信号的进一步编码。代码开关108根据确定或检测的信道101的特征进行这种选择。代码开关108表示在图1中,例如,用于从信道估计电路114和接收机200接收信息。
信道估计电路114产生对信道101特征的估计。估计信道特征的一种方法是通过在发射机100偶尔采样物理信道并且由信道估计电路114以一种公知的方式处理这些采样信号。接着信道估计电路114通过信号I2向代码开关108指示信道101是可靠的还是不可靠的。可以使用多个信道特征确定信道101是否是可靠的。例如,可靠信道可以是具有高的信噪比(SNR)的一个信道。尽管可以使用其他已知的信道特征控制代码开关108,但是为描述容易仅讨论高SNR和低SNR的情况。
如果信道估计电路114指示信道101是可靠的(高的SNR),则代码开关108选择第一代码电路110以便进一步编码经CRC编码的信息信号。为示例性目的,第一代码电路110使用前向纠错(FEC)码1发射该CRC编码的信息信号。另一种方案是,如果信道估计电路114指示信道101是不可靠的(低的SNR),则代码开关108选择第二代码电路112从而进一步编码该CRC编码的信息信号。第二代码电路112使用可能不同的FEC码2以发射该CRC编码的信息信号。
如已知的,FEC编码包括在发射前利用冗余信息编码比特序列以便在接收端可以检测到差错。FEC码1可以优选是速率1/n卷积码和FEC码2优选是速率1/n重复码。FEC码1(1/n卷积码)由于具有高的SNR比FEC码2(1/n重复码)表现得更好。相反地,FEC码2在具有低的SNR的信道上比FEC码1表现得更好,例如当信道处于深度衰落时。如该例所示,FEC码1和2二者优选具有相同的码率以便信息速率是不改变的。
代码开关108也可以从接收机200经过信号I3直接接收信息。差错信号I3是来自接收机200的反馈信号,表示接收机200不能可靠地解码发射的编码信号。因此接收机200请求使用不同的FEC码。当信道估计电路114不能估计信道101的特征时可以使用差错信号I3。另一种方案,可以结合信号I2使用差错信号I3选择适当的FEC码。
接着由选择的代码电路110或112产生的编码信号提供给发射电路116用于发射给接收机200。在编码的信号上由发射电路116可以执行各种公知的功能。例如,可以调制(调幅,调频和调相)和滤波编码的信号。发射电路116可以另外包括天线或通过信道101发射编码信号的其他设备。
编码的信号由接收机200从信道101接收。该编码的信号由滤波器202滤波和由解调器204解调。接着编码的信号加到第一接收机开关206,它或者选择第一解码器电路208或者选择第二解码器电路210以便解码编码的信号。根据上述的示例性代码选择电路104,第一解码器电路208解码FEC码1和第二解码器电路210解码FEC码2。第二接收机开关212将第一解码器电路208或第二解码器电路210之一与CRC解码器电路214连接。
第一和第二接收机开关206和212是同步的以便适当的解码器电路208或210连接到CRC解码器电路214。如公知的,CRC解码器电路是非常可靠的解码信息中的差错检测器。因为接收机200不必要知道使用哪种FEC码,所以CRC解码器电路214通过反馈信号I4向第一和第二解码器开关206和212指示何时使用不正确的解码器电路。例如,如果开关206和212连接正确的解码器电路208或210,则CRC解码器电路214解码产生的信息和认为其输出是发射的编码信号的可靠重放。另一方面,如果开关206和212连接错误的解码器电路208或210,则CRC解码器电路214将不能(具有高几率地)解码产生的信号。接着CRC解码器电路214通过信号I4命令开关206和212连接其他的解码器电路208或210。用于解码多种编码的具有相同结构的接收机公开在1993年7月20日授予Dent等人,名称为“识别不同类型的卷积编码信号的解码系统”的美国专利号5,230,003中,该专利的公开文本在此结合引用。
因此通过参照其优选的实施例详细描述了该发明,很明显在不脱离由所附权利要求书确定的发明范围的情况下,其他改进和变化是可能的。例如,接收机200可以具有脱离下文那些描述的设计结构。因此,所附权利要求书的精神和范围不应该限于此处包括的优选版本的描述。

Claims (17)

1.用于在信道上发射编码信号的一种发射机,该发射机包括:
用于接收待发射信息的一个源接口;
第一代码电路,用于以第一代码编码信息;
第二代码电路,用于以第二代码编码信息;和
一个代码开关,用于根据该信道的特征选择第一代码电路和第二代码电路之一;和
用于在该信道上发射编码信号的一个发射电路。
2.如权利要求1所述的发射机,其中第一代码电路包括:
用于使用卷积码编码信息的一个卷积码电路。
3.如权利要求2所述的发射机,其中第二代码电路包括:
用于使用重复码编码信息的一个重复码电路。
4.如权利要求3所述的发射机,其中还包括:
一个循环冗余校验电路,用于对所述源接口提供的信息编码。
5.如权利要求1所述的发射机,其中第二代码电路包括:
使用重复码编码信息的一个重复码电路。
6.如权利要求1所述的发射机,其中还包括:
一个信道估计电路,用于估计信道的特征。
7.用于在信道上发射编码的信号的一种方法,该方法包括步骤:
接收待发射的信息;
接收对应于该信道特征的信息;
根据所述信道的所述特征选择第一代码和第二代码之一,其中所述第一代码和所述第二代码是具有相同码率的不同代码;
使用选择的第一和第二代码之一编码该信息以便产生编码的信号;和
在该信道上向接收机发射编码的信号。
8.如权利要求7所述的方法,还包括步骤:
在发射步骤之前利用循环冗余校验码编码信号。
9.如权利要求7所述的方法,其中选择步骤包括步骤:
提供一个卷积码作为第一代码。
10.如权利要求9所述的方法,其中选择步骤包括步骤:
提供一个重复码作为第二代码。
11.如权利要求7所述方法,其中所述接收对应于信道特征的步骤包括步骤:
在发射机处对信道抽样;和
通过处理这些抽样结果估计该信道的特征。
12.如权利要求11所述的方法,其中所述估计信道特征的步骤包括步骤:
估计该信道的信噪比。
13.如权利要求7所述的方法,其中所述接收对应于信道特征的信息的步骤包括以下步骤:
从接收机接收指示信道特征的误差信号。
14.用于在信道上发射编码的信号的一个发射系统,该系统包括:
一个发射机,该发射机包括:
第一代码电路,用于以第一代码编码信息;
第二代码电路,用于以第二代码编码信息;和
一个编码开关,用于根据信道的特征选择第一代码电路和第二代码电路之一;和
发射电路,用于在信道上发射编码信号;以及
用于接收编码的信号的一个接收机。
15.如权利要求14所述的发射系统,其中该发射机还包括:
一个信道估计电路,用于估计该信道的特征。
16.如权利要求14所述的发射系统,其中该接收机包括:
一个解码器选择电路,用于检测为编码发射的编码信号而选择的第一和第二代码之一;和
一个解码器电路,用于解码编码的信号以响应该解码器选择电路。
17.如权利要求14所述的发射系统,其中代码开关接收来自接收机的误差信号,并且
其中该代码开关可以根据该差错信号选择第一和第二代码电路中的另一个代码电路。
CN97181998A 1997-01-03 1997-12-16 使用基于信道特征的自适应编码的发射机方法和发射系统 Expired - Fee Related CN1111990C (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/789,093 US6044485A (en) 1997-01-03 1997-01-03 Transmitter method and transmission system using adaptive coding based on channel characteristics
US08/789,093 1997-01-03

Publications (2)

Publication Number Publication Date
CN1249092A CN1249092A (zh) 2000-03-29
CN1111990C true CN1111990C (zh) 2003-06-18

Family

ID=25146570

Family Applications (1)

Application Number Title Priority Date Filing Date
CN97181998A Expired - Fee Related CN1111990C (zh) 1997-01-03 1997-12-16 使用基于信道特征的自适应编码的发射机方法和发射系统

Country Status (9)

Country Link
US (1) US6044485A (zh)
EP (1) EP0950301B1 (zh)
JP (1) JP3715656B2 (zh)
CN (1) CN1111990C (zh)
AU (1) AU5593898A (zh)
BR (1) BR9714249A (zh)
CA (1) CA2276777A1 (zh)
DE (1) DE69732652T2 (zh)
WO (1) WO1998029979A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101401163B (zh) * 2006-03-10 2013-04-24 国际商业机器公司 用于在数据中嵌入信息的方法和装置

Families Citing this family (89)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6208663B1 (en) * 1997-08-29 2001-03-27 Telefonaktiebolaget Lm Ericsson (Publ) Method and system for block ARQ with reselection of FEC coding and/or modulation
TW385602B (en) * 1998-05-26 2000-03-21 Koninkl Philips Electronics Nv Transmission system with adaptive channel encoder and decoder
US6292919B1 (en) * 1998-08-25 2001-09-18 General Electric Company Methods and apparatus for exchanging data in an imaging system
US7068729B2 (en) * 2001-12-21 2006-06-27 Digital Fountain, Inc. Multi-stage code generator and decoder for communication systems
US6307487B1 (en) * 1998-09-23 2001-10-23 Digital Fountain, Inc. Information additive code generator and decoder for communication systems
EP1064616B1 (en) * 1999-01-26 2003-07-30 Koninklijke Philips Electronics N.V. Data carrier provided with at least two decoding stages
US6314535B1 (en) * 1999-05-18 2001-11-06 Xircom Wireless, Inc. Dynamic forward error correction
US6405340B1 (en) * 1999-07-02 2002-06-11 Ericsson Inc. Flexible method of error protection in communications systems
JP3699863B2 (ja) * 1999-07-12 2005-09-28 株式会社日立コミュニケーションテクノロジー エラー訂正符号装置、エラー訂正符号復号装置および伝送装置
US6625777B1 (en) * 1999-10-19 2003-09-23 Motorola, Inc. Method of identifying an improved configuration for a communication system using coding gain and an apparatus therefor
US6738360B1 (en) * 1999-10-22 2004-05-18 Verizon Laboratories Inc. System and method for reliable video transmission in wireless Asynchronous Transfer Mode networks with fading
US7254120B2 (en) * 1999-12-09 2007-08-07 Broadcom Corporation Data rate controller
US6760882B1 (en) * 2000-09-19 2004-07-06 Intel Corporation Mode selection for data transmission in wireless communication channels based on statistical parameters
US6802035B2 (en) * 2000-09-19 2004-10-05 Intel Corporation System and method of dynamically optimizing a transmission mode of wirelessly transmitted information
US6807227B2 (en) * 2000-10-26 2004-10-19 Rockwell Scientific Licensing, Llc Method of reconfiguration of radio parameters for power-aware and adaptive communications
US6883130B2 (en) * 2001-05-24 2005-04-19 Telefonaktiebolaget Lm Ericsson (Publ) Enhanced and adaptive error detection in digital communications
US20020183010A1 (en) * 2001-06-05 2002-12-05 Catreux Severine E. Wireless communication systems with adaptive channelization and link adaptation
US6993393B2 (en) 2001-12-19 2006-01-31 Cardiac Pacemakers, Inc. Telemetry duty cycle management system for an implantable medical device
US7729776B2 (en) 2001-12-19 2010-06-01 Cardiac Pacemakers, Inc. Implantable medical device with two or more telemetry systems
US6985773B2 (en) 2002-02-07 2006-01-10 Cardiac Pacemakers, Inc. Methods and apparatuses for implantable medical device telemetry power management
US9240810B2 (en) * 2002-06-11 2016-01-19 Digital Fountain, Inc. Systems and processes for decoding chain reaction codes through inactivation
KR100474434B1 (ko) * 2002-07-19 2005-03-10 삼성전자주식회사 디지털 영상시스템 및 그 제어방법
US7133934B1 (en) * 2002-08-27 2006-11-07 Mindspeed Technologies, Inc. Adaptive error correction for communications over packet networks
EP2357732B1 (en) 2002-10-05 2022-04-06 QUALCOMM Incorporated Systematic encoding and decoding of chain reaction codes
US7155290B2 (en) * 2003-06-23 2006-12-26 Cardiac Pacemakers, Inc. Secure long-range telemetry for implantable medical device
US7213197B2 (en) * 2003-08-08 2007-05-01 Intel Corporation Adaptive bit loading with low density parity check forward error correction
EP1665539B1 (en) 2003-10-06 2013-04-10 Digital Fountain, Inc. Soft-Decision Decoding of Multi-Stage Chain Reaction Codes
US7228182B2 (en) * 2004-03-15 2007-06-05 Cardiac Pacemakers, Inc. Cryptographic authentication for telemetry with an implantable medical device
WO2005099817A1 (en) 2004-04-07 2005-10-27 Cardiac Pacemakers, Inc. Rf wake-up of implantable medical device
WO2005112250A2 (en) * 2004-05-07 2005-11-24 Digital Fountain, Inc. File download and streaming system
KR20070020024A (ko) 2004-05-11 2007-02-16 마쓰시다 일렉트릭 인더스트리얼 컴패니 리미티드 무선 송신 장치, 무선 수신 장치, 및 무선 통신 시스템
US7457669B2 (en) * 2004-06-17 2008-11-25 Cardiac Pacemakers, Inc. On-demand retransmission of data with an implantable medical device
US7519430B2 (en) * 2004-06-17 2009-04-14 Cardiac Pacemakers, Inc. Dynamic telemetry encoding for an implantable medical device
US7406349B2 (en) * 2004-08-09 2008-07-29 Cardiac Pacemakers, Inc. Dynamic telemetry link selection for an implantable device
US7890180B2 (en) * 2004-08-09 2011-02-15 Cardiac Pacemakers, Inc. Secure remote access for an implantable medical device
WO2006020826A2 (en) * 2004-08-11 2006-02-23 Digital Fountain, Inc. Method and apparatus for fast encoding of data symbols according to half-weight codes
US7861132B1 (en) 2004-11-19 2010-12-28 The Directv Group, Inc. Adaptive error correction
US20060150055A1 (en) * 2005-01-06 2006-07-06 Terayon Communication Systems, Inc. Adaptive information delivery system using FEC feedback
US7218969B2 (en) * 2005-01-19 2007-05-15 Cardiac Pacemakers, Inc. Dynamic channel selection for RF telemetry with implantable device
US7697483B2 (en) * 2005-04-04 2010-04-13 Ntt Docomo, Inc. Transmitting method, receiving method, radio base station, and mobile station
US7664553B2 (en) * 2005-04-27 2010-02-16 Cardiac Pacemakers, Inc. System and method for enabling communications with implantable medical devices
US7603591B2 (en) * 2005-07-19 2009-10-13 Mediatek Incorporation Apparatus selectively adopting different determining criteria in erasure marking procedure when performing decoding process, and method thereof
US7673222B2 (en) * 2005-07-15 2010-03-02 Mediatek Incorporation Error-correcting apparatus including multiple error-correcting modules functioning in parallel and related method
US8286051B2 (en) 2005-07-15 2012-10-09 Mediatek Inc. Method and apparatus for burst error detection and digital communication device
US7447980B2 (en) * 2005-10-17 2008-11-04 Newport Media, Inc. Error detection and correction in data transmission packets
CN101331498A (zh) 2005-12-14 2008-12-24 Nxp股份有限公司 用于通过无线电信道进行通信的方法和rfid读取器
CN101686107B (zh) 2006-02-13 2014-08-13 数字方敦股份有限公司 使用可变fec开销和保护周期的流送和缓冲
US9270414B2 (en) * 2006-02-21 2016-02-23 Digital Fountain, Inc. Multiple-field based code generator and decoder for communications systems
WO2007134196A2 (en) 2006-05-10 2007-11-22 Digital Fountain, Inc. Code generator and decoder using hybrid codes
US9419749B2 (en) 2009-08-19 2016-08-16 Qualcomm Incorporated Methods and apparatus employing FEC codes with permanent inactivation of symbols for encoding and decoding processes
US9178535B2 (en) * 2006-06-09 2015-11-03 Digital Fountain, Inc. Dynamic stream interleaving and sub-stream based delivery
US9432433B2 (en) 2006-06-09 2016-08-30 Qualcomm Incorporated Enhanced block-request streaming system using signaling or block creation
US20100211690A1 (en) * 2009-02-13 2010-08-19 Digital Fountain, Inc. Block partitioning for a data stream
US9380096B2 (en) 2006-06-09 2016-06-28 Qualcomm Incorporated Enhanced block-request streaming system for handling low-latency streaming
US9386064B2 (en) * 2006-06-09 2016-07-05 Qualcomm Incorporated Enhanced block-request streaming using URL templates and construction rules
US9209934B2 (en) 2006-06-09 2015-12-08 Qualcomm Incorporated Enhanced block-request streaming using cooperative parallel HTTP and forward error correction
US8185204B2 (en) 2006-07-12 2012-05-22 Cardiac Pacemakers, Inc. Implantable medical device telemetry with adaptive frequency hopping
EP1944902B1 (en) * 2007-01-10 2012-11-21 Alcatel Lucent A method for impulse noise monitoring, related network terminal, network node and network manager
US20080205229A1 (en) * 2007-02-26 2008-08-28 Yung-Chih Li Method of identifying optical disc
DE102007028767B4 (de) * 2007-06-22 2016-01-28 Continental Teves Ag & Co. Ohg Buskommunikationsschaltung zur sicheren seriellen Übertragung von Daten sowie deren Verwendung
RU2367007C2 (ru) * 2007-08-30 2009-09-10 Станислав Антонович Осмоловский Способ передачи и комплексной защиты информации
BRPI0816680A2 (pt) * 2007-09-12 2015-03-17 Qualcomm Inc Gerar e comunicar informações de identificação de origem pra habilitar comunicações confiáveis.
WO2009083960A2 (en) * 2007-12-31 2009-07-09 Runcom Technologies Ltd. System and method for mode selection based on effective cinr
US8719670B1 (en) * 2008-05-07 2014-05-06 Sk Hynix Memory Solutions Inc. Coding architecture for multi-level NAND flash memory with stuck cells
US20100100797A1 (en) * 2008-10-16 2010-04-22 Genesys Logic, Inc. Dual mode error correction code (ecc) apparatus for flash memory and method thereof
US20100138724A1 (en) * 2008-12-01 2010-06-03 Dsp Group Ltd. Adaptive error protection for wireless communications
US8418031B1 (en) * 2009-02-09 2013-04-09 Marvell International Ltd. Systems and methods for encoding data to meet an output constraint
US9281847B2 (en) * 2009-02-27 2016-03-08 Qualcomm Incorporated Mobile reception of digital video broadcasting—terrestrial services
JP5430738B2 (ja) * 2009-03-30 2014-03-05 テレフオンアクチーボラゲット エル エム エリクソン(パブル) 適応変調システムにおけるチャネルの推定
US9288010B2 (en) 2009-08-19 2016-03-15 Qualcomm Incorporated Universal file delivery methods for providing unequal error protection and bundled file delivery services
US9917874B2 (en) 2009-09-22 2018-03-13 Qualcomm Incorporated Enhanced block-request streaming using block partitioning or request controls for improved client-side handling
US20110096828A1 (en) * 2009-09-22 2011-04-28 Qualcomm Incorporated Enhanced block-request streaming using scalable encoding
US20110280311A1 (en) 2010-05-13 2011-11-17 Qualcomm Incorporated One-stream coding for asymmetric stereo video
US9596447B2 (en) 2010-07-21 2017-03-14 Qualcomm Incorporated Providing frame packing type information for video coding
US9456015B2 (en) 2010-08-10 2016-09-27 Qualcomm Incorporated Representation groups for network streaming of coded multimedia data
JP5624848B2 (ja) * 2010-10-22 2014-11-12 株式会社日立製作所 光通信カード、及び光伝送装置
US9270299B2 (en) 2011-02-11 2016-02-23 Qualcomm Incorporated Encoding and decoding using elastic codes with flexible source block mapping
US8958375B2 (en) 2011-02-11 2015-02-17 Qualcomm Incorporated Framing for an improved radio link protocol including FEC
JP5779979B2 (ja) * 2011-05-23 2015-09-16 ソニー株式会社 受信装置、及び、受信方法
US9253233B2 (en) 2011-08-31 2016-02-02 Qualcomm Incorporated Switch signaling methods providing improved switching between representations for adaptive HTTP streaming
US9843844B2 (en) 2011-10-05 2017-12-12 Qualcomm Incorporated Network streaming of media data
US9294226B2 (en) 2012-03-26 2016-03-22 Qualcomm Incorporated Universal object delivery and template-based file delivery
US9077534B2 (en) 2013-06-20 2015-07-07 Crossfield Technology, Llc Communications circuit including a linear quadratic estimator
RU2563058C1 (ru) * 2014-05-05 2015-09-20 Акционерное общество "Калужский научно-исследовательский институт телемеханических устройств" Способ адаптивного помехоустойчивого кодирования
RU2581770C1 (ru) * 2015-04-27 2016-04-20 Акционерное общество "Калужский научно-исследовательский институт телемеханических устройств" Способ контроля качества канала связи
RU167430U1 (ru) * 2016-07-08 2017-01-10 Открытое акционерное общество "Российский институт мощного радиостроения" Устройство оценки вероятности ошибки на бит для сигналов с восьмипозиционной фазовой модуляцией по четырехпозиционным сигналам
RU2620731C1 (ru) * 2016-07-20 2017-05-29 федеральное государственное казенное военное образовательное учреждение высшего образования "Военная академия связи имени Маршала Советского Союза С.М. Буденного" Способ совместного арифметического и помехоустойчивого кодирования и декодирования
US10775361B2 (en) * 2016-07-22 2020-09-15 Qualcomm Incorporated Monitoring control channel with different encoding schemes
US10866857B2 (en) * 2017-10-09 2020-12-15 Tsofun Algorithms Ltd. Encoding and decoding of permuted cyclic codes

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR643508A (fr) * 1927-04-06 1928-09-18 Brosse à dents
US3078443A (en) * 1959-01-22 1963-02-19 Alan C Rose Compound error correction system
US4047151A (en) * 1974-12-24 1977-09-06 Rydbeck Nils R C Adaptive error correcting transmission system
CA1235189A (en) * 1985-01-14 1988-04-12 Haruhiko Akiyama Error correction encoding system
US5134476A (en) * 1990-03-30 1992-07-28 At&T Bell Laboratories Video signal encoding with bit rate control
US5230003A (en) * 1991-02-08 1993-07-20 Ericsson-Ge Mobile Communications Holding, Inc. Decoding system for distinguishing different types of convolutionally-encoded signals
JPH05207075A (ja) * 1992-01-24 1993-08-13 Hitachi Ltd ディジタル通信システム
US5311547A (en) * 1992-02-03 1994-05-10 At&T Bell Laboratories Partial-response-channel precoding
US5305353A (en) * 1992-05-29 1994-04-19 At&T Bell Laboratories Method and apparatus for providing time diversity
US5430743A (en) * 1993-06-29 1995-07-04 Motorola, Inc. Method and apparatus for recovering data in a radio communication system
FR2710213B1 (fr) * 1993-09-13 1995-10-20 Thomson Csf Procédé et dispositif de régulation du débit d'information d'une liaison radioélectrique.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101401163B (zh) * 2006-03-10 2013-04-24 国际商业机器公司 用于在数据中嵌入信息的方法和装置

Also Published As

Publication number Publication date
US6044485A (en) 2000-03-28
JP3715656B2 (ja) 2005-11-09
AU5593898A (en) 1998-07-31
EP0950301A1 (en) 1999-10-20
DE69732652D1 (de) 2005-04-07
WO1998029979A1 (en) 1998-07-09
EP0950301B1 (en) 2005-03-02
BR9714249A (pt) 2000-04-18
JP2001507886A (ja) 2001-06-12
DE69732652T2 (de) 2005-12-29
CA2276777A1 (en) 1998-07-09
CN1249092A (zh) 2000-03-29

Similar Documents

Publication Publication Date Title
CN1111990C (zh) 使用基于信道特征的自适应编码的发射机方法和发射系统
US5430743A (en) Method and apparatus for recovering data in a radio communication system
US5968198A (en) Decoder utilizing soft information output to minimize error rates
DK175993B1 (da) Radiomodtager
US6298462B1 (en) Data transmission method for dual diversity systems
CN1083184C (zh) 数字通信的差错控制方法和差错控制装置
US5838267A (en) Method and apparatus for encoding and decoding digital information
US5289476A (en) Transmission mode detection in a modulated communication system
CN1146180C (zh) 自动重复请求数据通信方法和设备
CN1106727C (zh) 在有时间选择性衰落时生成辅助信息的方法
US7095996B2 (en) Wireless communication system, and demodulation method and data rate control method therefor
EP1166514B1 (en) Method and receiver for receiving and decoding signals modulated with different modulation methods
CN1109451C (zh) 坏帧标志和增强解码器
EP0947069B1 (en) Receiver decoder circuitry, and associated method, for decoding a channel encoded signal
CN1103513C (zh) 利用维特比译码器测量比特差错率的装置
US5493584A (en) Method for determining a channel quality metric in a receiver
WO2017214556A1 (en) Modulation adaption method for multi-mode modems
EP0983655B1 (en) Bit detection method in a radio communications system
US20060198371A1 (en) Method and apparatus for analyzing reliability of a flag value
US6263465B1 (en) Error detection and correction in systems receiving NRZ signals from transmission of RZ signals
JPH0750698A (ja) エラー検出回路および方法
US7287209B2 (en) System and method for detecting codeword errors in error correction code or cyclic redundancy check code
KR100551852B1 (ko) 수신기 내에서의 변조 심볼의 복조 방법 및 통신 시스템의수신기
SU1290555A1 (ru) Система передачи цифровой информации
JPH0724399B2 (ja) 信号伝送方法

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20030618

Termination date: 20141216

EXPY Termination of patent right or utility model