WO2000028709A1 - Dummy error addition circuit - Google Patents
Dummy error addition circuit Download PDFInfo
- Publication number
- WO2000028709A1 WO2000028709A1 PCT/JP1999/006295 JP9906295W WO0028709A1 WO 2000028709 A1 WO2000028709 A1 WO 2000028709A1 JP 9906295 W JP9906295 W JP 9906295W WO 0028709 A1 WO0028709 A1 WO 0028709A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- error
- bit
- output
- symbol data
- pseudo
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/24—Testing correct operation
- H04L1/241—Testing correct operation using pseudo-errors
Definitions
- the present invention relates to a pseudo error adding circuit, and more specifically, to a pseudo error that can use a performance check of a decoder for decoding a quadrature modulated signal by generating a bit error in a transmission path in a pseudo manner. It relates to an error adding circuit.
- a hierarchical transmission scheme for transmitting a digital broadcast by combining a plurality of transmission schemes with different reception C / N a hierarchical transmission scheme based on time-division multiplexing of m-phase modulation is known. This method enables stable digital signal transmission, but if CZN deteriorates in the transmission path, it must be affected by noise due to bit errors.
- An object of the present invention is to provide a pseudo error adding circuit for adding a pseudo error to various orthogonal modulation symbol data such as a PSK modulation symbol and a QAM modulation symbol data. Disclosure of the invention
- the pseudo error adding circuit of the present invention adds a bit error to the orthogonal modulation symbol data. According to the pseudo error adding circuit of the present invention, a bit error is added to the orthogonal modulation symbol data.
- the performance of the decoder can be checked by supplying it to the decoder.
- the pseudo error adding circuit includes an error pulse generating means for randomly generating an error pulse at a rate based on a designated bit error rate, and adds a bit error based on the error pulse. Therefore, according to the pseudo error adding circuit of the present invention, error pulses are randomly generated at a rate based on the specified bit error rate, and a bit error is added to the quadrature modulation symbol data based on this error pulse. Therefore, it is possible to simulate bit errors in the transmission path.
- the pseudo error adding circuit of the present invention includes bit selecting means for randomly selecting a bit to which an error is to be added from one bit in the orthogonal modulation symbol data, and the error adding circuit is provided. Since bit positions in the quadrature modulation symbol are randomly selected, bit errors in various transmission paths can be simulated.
- the pseudo error adding circuit basically comprises a counting means for periodically generating a monotonically increasing or decreasing numerical value sequence, a random signal generating means for generating a random number value sequence, Means for comparing the output values of the means and the random signal generation means with each other and generating an error occurrence indication signal when both output values match, Means for adding a bit error to specific symbol data in the orthogonal symbol data sequence at the time when the error generation instruction signal is generated in response to the sequence and the error generation instruction signal.
- the random number value output from the random signal generation means is updated every cycle of the numerical sequence output from the counter means.
- a bit to which a bit error is to be added from the bits in the specific symbol data at the time when the error generation indication signal is generated in response to the quadrature modulation symbol data sequence and an error is generated in this bit.
- Means for adding an error whereby a symbol data to be added with an error at an average period (based on a bit error rate specified in advance) from a given orthogonal modulation symbol data sequence is randomized. And an error is added to a bit at a specific bit position selected at random in the symbol data.
- FIG. 1 is a block diagram showing a configuration of a pseudo error adding circuit according to one embodiment of the present invention.
- FIG. 2 is a diagram showing a specific configuration example of a random number generator, a variable counter, and a comparator in the pseudo error adding circuit according to the embodiment of the present invention.
- FIG. 3 is a diagram showing a specific configuration example of a modulation mode selection circuit and a bit inversion circuit in the pseudo error adding circuit according to one embodiment of the present invention.
- FIG. 4 shows a pseudo error adding circuit according to an embodiment of the present invention.
- 6 is a truth table of the modulation mode selection circuit in the first embodiment.
- FIG. 5 is an explanatory diagram of signal point arrangement of symbol data applied to the pseudo error adding circuit according to one embodiment of the present invention.
- FIG. 6 is an explanatory diagram of the operation of the pseudo error adding circuit according to one embodiment of the present invention.
- FIG. 1 is a block diagram showing a configuration of a pseudo error adding circuit according to one embodiment of the present invention.
- the pseudo error adding circuit according to one embodiment of the present invention has 8 PSK modulation
- FIG. 2 illustrates a case where a configuration is made to correspond to the case of QPSK modulation and BPSK modulation.
- An object of the present invention is to provide a pseudo error adding circuit according to one embodiment of the present invention, in which a pseudo error is randomly added to a PSK modulation symbol and output.
- an error correction code which is an outer code, is added to a broadcast information signal such as an audio signal or a data signal, and interleaving is performed.
- a carrier of a predetermined frequency is modulated by PSK modulation symbol data obtained by performing a certain convolutional coding, and the modulated signal is radiated as a power supply into a wireless transmission medium.
- the present invention simulates the occurrence of this error by assuming a bit error of a digital signal caused by transmission deterioration (for example, a decrease in C / N) in the wireless transmission medium. .
- the pseudo error adding circuit is shown in FIG. As shown in the block diagram, it is output from the variable count 1 and the variable count 1 that receive the clock signal and the bit error rate select signal and transmit the count value and carry based on the bit error rate.
- Random number generator that sends a sequence of random values in response to a carry
- the pseudo error adding circuit includes a modulation mode selection circuit 4 that receives an error pulse and sends out an inversion instruction signal based on the indicated modulation mode;
- a bit inversion circuit 5 for selectively inverting the bit of the symbol data in response to the symbol data and adding a pseudo error is provided.
- Figure 2 shows a specific example of the configuration of the variable counter 1, random number generator 2, and comparator 3 that form part of the block (lower part) of the pseudo error adding circuit shown in Fig. 1. It is.
- Roh 'Li Aburukaun evening 1 as a whole input CLK in response to the 0-2 4 11 - 1 4-bit binary count of the n performs the (maximum) counter evening 1 0 1 to 1 0 n and one of the n inputs XI to Xn according to the bit error rate selection instruction signal (code 0, 1, 2,..., n corresponding to the error rate) It consists of an n-input selector 11 that selects and outputs it as Y.
- the random number generator 2 includes a PN data generator (PNG) 21 for generating a sequence of 4 n-bit pseudo-random numbers (PN) and a carry output from the selector 11 in the noble count 1.
- PNG PN data generator
- Comparator 3 has n 2-input comparators 3 0 — 1, 3 0 — 2, 3 0 — 3 (operating to generate a pulse when the values of the two inputs match) , ⁇ , 3 0 — n and the lower 4 bits of each of the binary 4 n-bit signals output from the random number generator 2 and the n-stage binary counter 1 0 — 1 to 1 0 — n , Lower 8 bits, lower 12 bits, ..., lower 4 n bits are input as comparators 30-1 to 30 — n, and the input bit error rate selection instruction signal An n-input selector that selects one output of n comparators 30 — 1 to 30 — n according to (codes l to n) and extracts it as an error generation indication signal (error pulse) 3 1
- 1 0-2, 1 0 — 3,..., 1 0 — n are the carry (here, the “L” signal) at 2 ', 2 ⁇ 2
- the code of the error selection instruction signal '' 3 '' is printed on the SEL terminal of the selector 11 in the variable count 1 and the selector 31 of the comparator 3. Be added.
- the carry from the CO of the binary counters 10 — 3 is selected by the selector 11, extracted from the Y, and applied to all the binary counters 10 — 1 to 10 — n CL At the same time, this carry is applied to EN of the latch 22 in the random number generator 2. For this reason, Roh Li Aburukaun evening 1, 2 12 - 1 ends the count at and is initialized (Zerokaun Bok) in the next click lock point, then the same counter Bok is to be resumed.
- the latch 22 in the random number generator 2 latches a new PN signal and outputs it to P1 to P4n. As described above, in the latch 22, the PN data stored before the carrier is input is transmitted until the carrier output from the No.
- an error pulse is output randomly once every 10 ⁇ times (0 to 999... 99) on average. Will be done.
- PNG which generates a pseudo random number sequence ⁇ ⁇ signal
- an analog noise signal generated by thermal noise is converted into a digital random number sequence by AZD conversion It is of course possible to do so.
- variable count 1, random number generator 2 and comparator 3 constitute an error pulse generating means that randomly generates an error pulse at a rate based on the bit error rate specified as a whole. Become.
- the modulation mode selection circuit 4 outputs an error pulse as shown in FIG. PN data generation that outputs an error-added bit selection signal that is PN data (the error-added bit selection signal is also referred to as PNSEL 1 and PNSEL 0 and that uses two bits) Unit 41, a bit selector 40 that receives the PN data from the PN data generator 41, and randomly selects a bit to add an error, and outputs an error pulse and an output from the bit selector 40. It is composed of AND gates 46a, 46b and 46c as inputs.
- the bit selector 40 has an inverter 42 a that logically inverts the error addition bit selection signal PNSEL 0, an inverter 4 2 b that logically inverts the error addition bit selection signal PNSEL 1, and an error addition.
- Inverter 4 2c for logically inverting the bit selection signal PNSEL 1 and AND gate 4 3a for performing a logical AND operation between the output of inverter 4a and the output of inverter 4b.
- An AND gate 43b for performing a logical AND operation between the error addition bit selection signal PNSEL0 and the output of the inverter 42c is provided.
- the bit selector 40 includes an AND gate 44 a for performing an AND operation on the 8 PSK selection signal (the 8 PSK selection signal is also referred to as 8 PSKSEL) and an output of the AND gate 43 a, and an error AND gates 44 b and 44 d for AND operation of additional bit selection signal PNSEL 0 and QPSK selection signal (QPSK selection signal is also referred to as QPSKSEL), and 8 PSK selection signal and AND gate 43 b And an AND gate 44 e for performing an AND operation on the error addition bit selection signal PNSEL 1 and the 8 PSK selection signal.
- the 8 PSK selection signal is also referred to as 8 PSKSEL
- QPSKSEL QPSK selection signal
- bit selector 40 performs an OR operation of an AND gate 44a output, an AND gate 44b output, and a BPSK selection signal (the BPSK selection signal is also referred to as BPSKSEL).
- an OR gate 45b that performs a logical OR operation between the output of the AND gate 44c and the output of the AND gate 44d, and the output of the OR gate 45a is provided as an AND gate.
- the output of OR gate 45b is sent to AND gate 46b, the output of AND gate 44e is sent to AND gate 46c, and the gate is output.
- An error pulse is output from the opened AND gate 46a, 46b46c.
- the truth table of the modulation mode selection circuit 4 is as shown in FIG. That is, when 8 PSKSEL is selected by the modulation mode selection signal, if the error addition bit selection signal PNSEL 1 or PNSEL 0 is '0 0', the error is added to the LSB of the 8 PSK symbol data.
- the output of OR gate 45a becomes high potential
- the output of OR gate 45b becomes low potential
- the output of AND gate 44e becomes low potential
- Only the gate 46a is in a state where the gate is opened, the LSB of the 8PSK symbol is selected, and an error pulse is output from the AND gate 46a.
- the error added bit selection signal PNSEL 1 and PNSEL 0 output ⁇ 1 X ”(X may be either“ 0 ”or“ 1 ”) Occasionally, an error is added to the MSB of the 8PSK symbol data, and the output of OR gate 45a becomes low potential, the output of OR gate 45 becomes low potential, and the output of OR gate 45 becomes low potential. 4 The output of e becomes high potential, only the gate 46c is open, the MSB of 8PSK symbol data is selected, and an error pulse is output. Output from 6c.
- the modulation mode selection circuit 4 outputs the inversion instruction signal.
- the inversion instruction signal a bit to which an error is added is randomly specified based on the PN data output from the PN data generator 41, and an error pulse is output for the specified bit. That would be.
- the modulation mode selection circuit 4 Based on the PN data output from the PN data generator 41, the modulation mode selection circuit 4 generates a bit for adding an error from the bits in the symbol data based on the selected modulation mode. This means that the bit selection means for randomly selecting the bits at intervals based on the bit error rate is configured.
- the bit inverting circuit 5 is supplied with the symbol data, and outputs from the AND gate 46a, the output from the AND gate 46b, and the AND gate 46c. Output from the Other OR circuits 51a, 51, 51c are provided, and the error-added symbol data, which is obtained by inverting the exclusive OR circuits 51a, 51, 51c by one bit and adding an error, is added Is output.
- the baseband signal of the 8PSK modulation which is the symbol data
- FIG. 5 (a) shows the phase plane as shown in FIG. 5 (a).
- FIG. 5 (b) shows the signal point arrangement of the baseband signal of QPSK modulation, and the combinations of the bits constituting the symbol are (0, 0), (0, 1), (1, 0). ), (1, 1), which are converted into signal point arrangements 0 to 3 on the I-Q plane.
- FIG. 5 (c) shows the signal point arrangement of the baseband signal of the BPSK modulation.
- the combination of the bits constituting the symbol is (0), (1), and the signal point arrangement 0, 1 Has been converted.
- the error addition bit selection signals PNSEL 1 and PNSEL 0 are selected to “xx” If so, the symbol data “1" is inverted and erroneously changed to "0" by 1 bit. In addition, when the symbol data “0” is input, the symbol data “0” is inverted and 1 bit is erroneously converted to “1”.
- the pseudo error adding circuit the pseudo error is added at random to the bits selected at random on the baseband signal at the rate based on the set bit error rate without direct modulation. By supplying the symbolized data to which the pseudo error has been added to the decoder and decoding it, the performance of the decoder can be checked. Effective design can be achieved.
- the configuration and operation of the present invention have been described by taking as an example the addition of a bit error to 8 PSK, QPSK, and BPSK symbol data according to the modulation scheme employed in a digital broadcast receiver. Is not limited to only adding a bit error to the polyphase PSK symbol data.
- the technical scope of the present invention is not limited to the above-described exemplary embodiment, and the present invention can be applied to error addition to multi-level quadrature modulation symbol data without departing from the principle. It should be understood that there is.
- the pseudo error adding circuit according to the embodiment of the present invention can also be used for a portable telephone.
- a pseudo error is added to a randomly selected bit on a baseband signal at a rate based on the set bit error rate. Can be used to check the performance of the decoder.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/807,029 US6772378B1 (en) | 1998-11-11 | 1999-11-11 | Dummy error addition circuit |
DE69939835T DE69939835D1 (de) | 1998-11-11 | 1999-11-11 | Addierschaltung mit scheinfehlern |
DE1130865T DE1130865T1 (de) | 1998-11-11 | 1999-11-11 | Addierschaltung mit scheinfehlern |
CA002349854A CA2349854C (en) | 1998-11-11 | 1999-11-11 | Dummy error addition circuit |
EP99971981A EP1130865B1 (en) | 1998-11-11 | 1999-11-11 | Dummy error addition circuit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10/321086 | 1998-11-11 | ||
JP32108698A JP3612660B2 (ja) | 1998-11-11 | 1998-11-11 | 擬似エラー付加回路 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000028709A1 true WO2000028709A1 (en) | 2000-05-18 |
Family
ID=18128668
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/006295 WO2000028709A1 (en) | 1998-11-11 | 1999-11-11 | Dummy error addition circuit |
Country Status (7)
Country | Link |
---|---|
US (1) | US6772378B1 (ja) |
EP (1) | EP1130865B1 (ja) |
JP (1) | JP3612660B2 (ja) |
CN (1) | CN1149800C (ja) |
CA (1) | CA2349854C (ja) |
DE (2) | DE1130865T1 (ja) |
WO (1) | WO2000028709A1 (ja) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002022787A (ja) * | 2000-07-07 | 2002-01-23 | Dx Antenna Co Ltd | C/n比測定装置及びc/n比測定方法 |
CN1149803C (zh) * | 2001-09-30 | 2004-05-12 | 华为技术有限公司 | 一种基于比特变换的数据重传方法 |
TW200518074A (en) * | 2005-01-19 | 2005-06-01 | Via Tech Inc | Test compact disk and its manufacturing method |
JP5157645B2 (ja) * | 2008-05-28 | 2013-03-06 | 日本電気株式会社 | 無線通信システム、制御用チャネル送信方法、及び、受信方法 |
JP5101426B2 (ja) * | 2008-07-30 | 2012-12-19 | アンリツ株式会社 | ランダムエラー信号発生装置 |
US8008748B2 (en) * | 2008-12-23 | 2011-08-30 | International Business Machines Corporation | Deep trench varactors |
CN101761204B (zh) * | 2010-01-11 | 2011-06-15 | 南京工业大学 | 一种陶瓷墙地砖填缝方法 |
FR3051086B1 (fr) * | 2016-05-04 | 2019-07-26 | Stmicroelectronics (Rousset) Sas | Circuit de comptage d'impulsions |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS4998508A (ja) * | 1973-01-22 | 1974-09-18 | ||
JPS57174958A (en) * | 1981-04-21 | 1982-10-27 | Nec Corp | Pseudo error pulse inserting circuit |
JPH01109839A (ja) * | 1987-10-23 | 1989-04-26 | Nippon Telegr & Teleph Corp <Ntt> | ディジタル無線チャネルシミュレータ |
JPH0646105A (ja) * | 1992-07-27 | 1994-02-18 | Anritsu Corp | デジタル信号の擾乱付加装置 |
JPH08242259A (ja) * | 1995-03-01 | 1996-09-17 | Advantest Corp | デジタル機器の試験装置及びその試験方法 |
JPH09135274A (ja) * | 1995-11-07 | 1997-05-20 | Japan Radio Co Ltd | ディジタル通信用フェージングシミュレータ |
Family Cites Families (7)
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JPS6020659A (ja) * | 1983-07-15 | 1985-02-01 | Fujitsu Ltd | デジタルデ−タのエラ−ビツト発生器 |
GB8421500D0 (en) * | 1984-08-24 | 1984-09-26 | British Telecomm | Error generation |
JPS6211317A (ja) * | 1985-07-09 | 1987-01-20 | Fujitsu Ltd | 擬似ランダム誤りパタ−ン信号発生装置 |
JPS63248242A (ja) * | 1987-04-03 | 1988-10-14 | Fujitsu Ltd | 誤り発生回路 |
JPH0371740A (ja) * | 1989-08-11 | 1991-03-27 | Nec Corp | 符号誤り付加回路 |
JP3419484B2 (ja) * | 1992-03-30 | 2003-06-23 | 株式会社東芝 | 変調器、送信器 |
JPH09321681A (ja) * | 1996-05-31 | 1997-12-12 | Fujitsu Ltd | 送信電力制御装置 |
-
1998
- 1998-11-11 JP JP32108698A patent/JP3612660B2/ja not_active Expired - Fee Related
-
1999
- 1999-11-11 DE DE1130865T patent/DE1130865T1/de active Pending
- 1999-11-11 US US09/807,029 patent/US6772378B1/en not_active Expired - Fee Related
- 1999-11-11 EP EP99971981A patent/EP1130865B1/en not_active Expired - Lifetime
- 1999-11-11 CN CNB998131393A patent/CN1149800C/zh not_active Expired - Fee Related
- 1999-11-11 DE DE69939835T patent/DE69939835D1/de not_active Expired - Lifetime
- 1999-11-11 WO PCT/JP1999/006295 patent/WO2000028709A1/ja active Application Filing
- 1999-11-11 CA CA002349854A patent/CA2349854C/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4998508A (ja) * | 1973-01-22 | 1974-09-18 | ||
JPS57174958A (en) * | 1981-04-21 | 1982-10-27 | Nec Corp | Pseudo error pulse inserting circuit |
JPH01109839A (ja) * | 1987-10-23 | 1989-04-26 | Nippon Telegr & Teleph Corp <Ntt> | ディジタル無線チャネルシミュレータ |
JPH0646105A (ja) * | 1992-07-27 | 1994-02-18 | Anritsu Corp | デジタル信号の擾乱付加装置 |
JPH08242259A (ja) * | 1995-03-01 | 1996-09-17 | Advantest Corp | デジタル機器の試験装置及びその試験方法 |
JPH09135274A (ja) * | 1995-11-07 | 1997-05-20 | Japan Radio Co Ltd | ディジタル通信用フェージングシミュレータ |
Non-Patent Citations (1)
Title |
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See also references of EP1130865A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1130865A1 (en) | 2001-09-05 |
JP2000151730A (ja) | 2000-05-30 |
CN1149800C (zh) | 2004-05-12 |
CN1325582A (zh) | 2001-12-05 |
JP3612660B2 (ja) | 2005-01-19 |
DE69939835D1 (de) | 2008-12-11 |
CA2349854C (en) | 2008-08-05 |
EP1130865A4 (en) | 2005-09-28 |
EP1130865B1 (en) | 2008-10-29 |
CA2349854A1 (en) | 2000-05-18 |
US6772378B1 (en) | 2004-08-03 |
DE1130865T1 (de) | 2002-02-21 |
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