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1. 发明授权

US11824993B2 MAC tag list generation apparatus, MAC tag list verification apparatus, method, and program 有权
公开(公告)号：US11824993B2
公开(公告)日：2023-11-21
申请号：US17601136
申请日：2019-04-18
申请人： NEC Corporation
发明人： Kazuhiko Minematsu , Norifumi Kamiya
IPC分类号： H04L9/32 , H04L9/06
CPC分类号： H04L9/3242 , H04L9/0618 , H04L9/0662
摘要： A MAC tag list generation apparatus includes: a message input part; a group testing matrix generation part which generates a t×m group testing matrix H that is a parameter(s) of combinatorial group testing with respect to the number s (s being a positive integer) of the MACs to be generated, a decodable linear group testing MAC application part which, with respect to the message M, using the group testing matrix H, a variable-length-input fixed-length-output pseudorandom function F; and a Tweakable block cipher G for which a row index of the group testing matrix H is a Tweak, generates a MAC tag list T=(T[1], . . . , T[t]); and a MAC tag list output part which outputs the MAC tag list.

2. 发明授权

US11552827B2 Signal estimation apparatus, signal estimation method and program recording medium 有权
公开(公告)号：US11552827B2
公开(公告)日：2023-01-10
申请号：US17490278
申请日：2021-09-30
申请人： NEC Corporation
发明人： Norifumi Kamiya
IPC分类号： H04L5/12 , H04L25/02 , H04B7/06 , H04B7/0456
摘要： A signal estimation apparatus classifies reception signal components included in a reception signal y and transmission signal components included in a transmission signal into a plurality of signal groups in accordance with a degree of a correlation between the reception signal component and the transmission signal component, on the basis of system information, sets, for each signal group, parameters β, ρ, τ and η that specifies a detail of a signal estimation method to be either one of a learned value that is learnable by a learning operation and a fixed value that is independent from the learning operation, and estimates, for each signal group, an estimation signal xe that is an estimated value of the transmission signal from the reception signal by using the signal estimation method specified by the set parameter.

3. 发明授权

US11336306B2 Decoding apparatus, decoding method, and non-transitory computer readable medium 有权
公开(公告)号：US11336306B2
公开(公告)日：2022-05-17
申请号：US16972957
申请日：2018-06-08
申请人： NEC CORPORATION
发明人： Norifumi Kamiya
IPC分类号： H03M13/41 , H03M13/39 , H03M13/13 , H03M13/25
摘要： A decoding apparatus includes a multi-input branch metric calculation unit configured to calculate, by using a branch label corresponding to a path extending toward a state S at a time point N in a trellis diagram and a plurality of reception signal sequences, a branch metric in the state S, a path metric calculation unit configured to calculate a path metric in the state S at the time point N, and a surviving path list memory configured to store path labels corresponding to L path metrics among a plurality of calculated path metrics. The path metric calculation unit generates a path label in the state S at the time point N by combining the branch label with a path label in each of the states at the time point N−1 and the surviving path list memory outputs path labels corresponding to L path metrics.

4. 发明授权

US11165438B2 Error-correction encoding method and device, and decoding method and device using channel polarization 有权
公开(公告)号：US11165438B2
公开(公告)日：2021-11-02
申请号：US16956004
申请日：2017-12-27
申请人： NEC Corporation
发明人： Norifumi Kamiya
IPC分类号： H03M13/11 , H03M13/09 , H03M13/13 , H03M13/25 , H03M13/29 , H03M13/41
摘要： [Problem] Encoding and decoding techniques capable of speeding up an error-correction decoding process utilizing channel polarization are provided.
[Solution] In an encoding device, the information bit sequence is input on division for each designated bit length; error-correction encoding is performed on an information block of the designated bit length to generate L M-bit codes, each M-bit code having a predetermined bit length M; the L M-bit codes are converted into M L-bit blocks each having a predetermined bit length of L; the M L-bit blocks are Polar-converted to M L-bit codes, each L-bit code having a bit length of L, through channel polarization processing; and division of the information bit sequence is determined based on channel polarization information.

5. 发明授权

US11588531B2 Signal estimation apparatus, signal estimation method and program recording medium 有权
公开(公告)号：US11588531B2
公开(公告)日：2023-02-21
申请号：US17220241
申请日：2021-04-01
申请人： NEC Corporation
发明人： Norifumi Kamiya
IPC分类号： H04L27/26 , H04B7/06 , H04B17/309 , H04B7/0413 , H04B17/29 , H04L25/02
摘要： An apparatus performs a discrete Fourier transform process on M×N received signal components included in a received signal, by a unit of N received signal components; and estimates an estimated signal containing M×N estimated signal components, which are estimated values of M×N transmission signal components, on the basis of the received signal on which the discrete Fourier transform process is performed. When the estimated signal xe is newly estimated, the apparatus performs an exclusion operation of excluding an estimated value xe(k) of the M transmission signal components that constitute a k-th transmission signal group from the estimated signal xe newly estimated, and updates the estimated value xe(k) based on an intermediate signal xt(k) obtained by the exclusion operation and the received signal, thereby re-estimating the estimated signal xe.

6. 发明授权

US10763973B2 Phase noise compensation apparatus, demodulation apparatus, communication apparatus, communication system, and phase noise compensation method 有权
公开(公告)号：US10763973B2
公开(公告)日：2020-09-01
申请号：US16325762
申请日：2017-05-16
申请人： NEC Corporation
发明人： Norifumi Kamiya , Eisaku Sasaki
IPC分类号： H04B10/61 , H04L27/38 , G01R29/26 , H04B10/294 , H04L25/02 , H04L27/26 , H04B10/516
摘要： A phase noise compensation apparatus is used for a demodulation apparatus for demodulating a transmission signal modulated by a modulation scheme that uses phase information for data identification. A phase detector detects a phase error of a reception pilot symbol sequence included in a reception symbol sequence. A first filter refers to the phase error detected in a time series manner and sequentially estimates first phase noise components. A second filter refers to the phase error detected in a reverse time series manner and sequentially estimates second phase noise components. The synthesis processing unit estimates a phase noise component of a reception symbol based on an estimated value of the first phase noise component, an estimated value of the second phase noise component, and the phase error. The phase rotator rotates a phase of the reception symbol based on the estimated phase noise component of the reception symbol.

7. 发明授权

US09136979B2 Carrier wave reproduction device and carrier wave reproduction method 有权
标题翻译：载波再现装置和载波再现方法
公开(公告)号：US09136979B2
公开(公告)日：2015-09-15
申请号：US14396089
申请日：2013-04-23
申请人： NEC CORPORATION
发明人： Norifumi Kamiya , Eisaku Sasaki
IPC分类号： H04L1/00 , H04L27/38 , H04L27/00 , H04L27/22
CPC分类号： H04L1/0036 , H04L1/0045 , H04L27/0014 , H04L27/22 , H04L27/3818 , H04L27/3836 , H04L2027/0024 , H04L2027/0046 , H04L2027/0061 , H04L2027/0067 , H04L2027/0087
摘要： The present invention provides a carrier wave reproduction device in which bit-error characteristics are improved without decreasing transmission capacity. The carrier wave reproduction device is equipped with an interpolation filter that estimates a phase error for a received symbol on the basis of a pilot symbol included in the received symbol, a first phase rotation machine that rotates a phase of the received symbol in response to the phase error estimated by the interpolation filter and then outputs the rotated symbol as a first output symbol, a phase error compensating unit that compensates for the phase error remaining in the first output symbol and then outputs the result of the compensation as a second output symbol, a QAM symbol demapping unit that calculates both a first bit string corresponding to the first output symbol and a second bit string corresponding to the second output signal, and an error correction decoder which performs error correction on the bit error in the first bit string and outputs the result. The phase error compensating unit refers to the first bit string after error correction has been performed thereon and then compensates for the phase error remaining in the first output symbol.
摘要翻译：本发明提供一种在不降低传输容量的情况下提高误码特性的载波再现装置。载波再现装置配备有内插滤波器，其基于包括在接收符号中的导频符号来估计接收符号的相位误差，第一相位旋转机器，响应于所接收的符号旋转接收符号的相位相位误差，然后输出旋转符号作为第一输出符号;相位误差补偿单元，补偿第一输出符号中剩余的相位误差，然后输出补偿结果作为第二输出符号， QAM符号解映射单元，其计算与第一输出符号对应的第一比特串和对应于第二输出信号的第二比特串;以及纠错解码器，对第一比特串中的比特错误进行纠错，并输出结果。相位误差补偿单元是在其上执行纠错之后的第一位串，然后补偿第一输出符号中剩余的相位误差。

8. 发明申请

US20150085960A1 CARRIER WAVE REPRODUCTION DEVICE AND CARRIER WAVE REPRODUCTION METHOD 有权
标题翻译：载波波复制器和载波波复制方法
公开(公告)号：US20150085960A1
公开(公告)日：2015-03-26
申请号：US14396089
申请日：2013-04-23
申请人： NEC CORPORATION
发明人： Norifumi Kamiya , Eisaku Sasaki
IPC分类号： H04L1/00 , H04L27/22
CPC分类号： H04L1/0036 , H04L1/0045 , H04L27/0014 , H04L27/22 , H04L27/3818 , H04L27/3836 , H04L2027/0024 , H04L2027/0046 , H04L2027/0061 , H04L2027/0067 , H04L2027/0087
摘要： The present invention provides a carrier wave reproduction device in which bit-error characteristics are improved without decreasing transmission capacity. The carrier wave reproduction device is equipped with an interpolation filter that estimates a phase error for a received symbol on the basis of a pilot symbol included in the received symbol, a first phase rotation machine that rotates a phase of the received symbol in response to the phase error estimated by the interpolation filter and then outputs the rotated symbol as a first output symbol, a phase error compensating unit that compensates for the phase error remaining in the first output symbol and then outputs the result of the compensation as a second output symbol, a QAM symbol demapping unit that calculates both a first bit string corresponding to the first output symbol and a second bit string corresponding to the second output signal, and an error correction decoder which performs error correction on the bit error in the first bit string and outputs the result. The phase error compensating unit refers to the first bit string after error correction has been performed thereon and then compensates for the phase error remaining in the first output symbol.
摘要翻译：本发明提供一种在不降低传输容量的情况下提高误码特性的载波再现装置。载波再现装置配备有内插滤波器，其基于包括在接收符号中的导频符号来估计接收符号的相位误差，第一相位旋转机器，响应于所接收的符号旋转接收符号的相位相位误差，然后输出旋转符号作为第一输出符号;相位误差补偿单元，补偿第一输出符号中剩余的相位误差，然后输出补偿结果作为第二输出符号， QAM符号解映射单元，其计算与第一输出符号对应的第一比特串和对应于第二输出信号的第二比特串;以及纠错解码器，对第一比特串中的比特错误进行纠错，并输出结果。相位误差补偿单元是在其上执行纠错之后的第一位串，然后补偿第一输出符号中剩余的相位误差。

9. 发明授权

US11831347B2 Parameter determination apparatus, signal transmission apparatus, parameter determination method, signal transmission method and recording medium 有权
公开(公告)号：US11831347B2
公开(公告)日：2023-11-28
申请号：US17641187
申请日：2020-09-02
申请人： NEC Corporation
发明人： Masaaki Tanio , Norifumi Kamiya , Naoto Ishii
IPC分类号： H04B1/04 , G06N3/08
CPC分类号： H04B1/0475 , G06N3/08
摘要： A parameter determination apparatus (2) includes: a first learning device (2111) learning a weight between a [j−1]-th layer (j is an integer that satisfies a condition that “2≤j≤the number of the layer”) and a [j]-th layer to which an output of the [j−1]-th layer is inputted among a plurality of layers of a neural network; a selecting device (2112) selecting at least one valid path for each node included in the [j]-th layer from a plurality of connection paths that connect nodes in the [j−1]-th layer and nodes in the [j]-th layer, respectively, on the basis of the weight learned by the first learning device; and a second learning device (2113) learning at least one of the weight and a bias as the parameters relating to a network structure between the [j−1]-th layer and the [j]-th layer on the basis of the sample signal, the label signal and the valid path.

10. 发明授权

US11418285B2 Method and apparatus for construction of polar codes 有权
公开(公告)号：US11418285B2
公开(公告)日：2022-08-16
申请号：US17283289
申请日：2018-10-10
申请人： NEC Corporation
发明人： Prakash Chaki , Norifumi Kamiya
IPC分类号： H04L1/00 , H03M13/09 , H03M13/15 , H03M13/27 , H03M13/45
摘要： A communication apparatus for forward error correction and detection using polar codes comprising a polar encoder that encodes an input vector to output a codeword using a generator matrix of polar code wherein the input vector is a cyclic redundancy check (CRC) codeword of an information block; a memory that stores a frozen set including frozen bit indices and a non-frozen set including non-frozen bit indices sorted in order of error probabilities; and a controller that is configured to take as input the CRC codeword where CRC bits appended to the end of information block and interleave the CRC codeword using at least one of a first interleaver and second interleaver before feeding the CRC codeword to polar encoder such that the first interleaver places at least one CRC bit earlier than its original position in the CRC codeword and a second interleaver selects at least one bit from the CRC codeword whose corresponding index in a parity check matrix of the CRC code has the highest column weight and puts it in the non-frozen bit index with highest error probability.

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