公开(公告)号：US20200028767A1

公开(公告)日：2020-01-23

申请号：US16471258

申请日：2017-12-15

Applicant: NTT Electronics Corporation ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Mitsuteru YOSHIDA ,  Yasuyuki ENDO ,  Etsushi YAMAZAKI ,  Katsuichi OYAMA ,  Yasuharu ONUMA ,  Masahito TOMIZAWA

IPC: H04L12/26 ,  H04N21/2383 ,  H04L5/02 ,  H04L5/00 ,  H03M13/29

Abstract: A plurality of error correction circuits corrects errors of the data transmitted through the plurality of transmission lines. A combining portion combines the plurality of transmission lines to the plurality of error correction circuits. The plurality of transmission lines includes a first transmission line, and a second transmission line having a lower transmission characteristic than the first transmission line. The plurality of error correction circuits includes a first and a second error correction circuit having lower error correction capability and power consumption than the first error correction circuit. The combining portion uses a function to combine a plurality of error correction circuits with one transmission path, combines the first transmission line with the second error correction circuit at a higher rate than the first error correction circuit, and combines the second transmission line with the first error correction circuit at a higher rate than the second error correction circuit.

公开(公告)号：US20190132051A1

公开(公告)日：2019-05-02

申请号：US16094857

申请日：2017-06-21

Applicant: NTT ELECTRONICS CORPORATION ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yasuharu ONUMA ,  Etsushi YAMAZAKI ,  Hiroyuki NOUCHI ,  Tomohiro TAKAMUKU ,  Katsuichi OYAMA ,  Kazuhito TAKEI ,  Masanori NAKAMURA ,  Mitsuteru YOSHIDA ,  Masahito TOMIZAWA

IPC: H04B10/40 ,  H04B10/516 ,  H04B10/61 ,  H04B10/58

CPC classification number: H04B10/40 ,  H04B10/2507 ,  H04B10/5161 ,  H04B10/58 ,  H04B10/60 ,  H04B10/6163 ,  H04L27/01 ,  H04L27/06

Abstract: An I component compensation unit calculates an I component in which a distortion has been compensated, by forming a first polynomial expressing the distortion of the I component based on an I component and a Q component of a quadrature modulation signal and multiplying each term of the first polynomial by a first coefficient. A Q component compensation unit calculates a Q component in which a distortion has been compensated, by forming a second polynomial expressing the distortion of the Q component based on the I component and the Q component of the quadrature modulation signal and multiplying each term of the second polynomial by a second coefficient. A coefficient calculation unit calculates the first and second coefficients by comparing outputs of the I component compensation unit and the Q component compensation unit and a known signal.

公开(公告)号：US20180175830A1

公开(公告)日：2018-06-21

申请号：US15553909

申请日：2017-01-16

Applicant: NTT ELECTRONICS CORPORATION ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yasuharu ONUMA ,  Etsushi YAMAZAKI ,  Kazuhito TAKEI ,  Osamu ISHIDA ,  Kengo HORIKOSHI ,  Mitsuteru YOSHIDA ,  Yoshiaki KISAKA ,  Masahito TOMIZAWA

IPC: H03H17/02 ,  H04L7/00

CPC classification number: H03H17/0227 ,  H03H17/0213 ,  H03H17/0275 ,  H03H17/0685 ,  H03H2017/0214 ,  H03H2017/0245 ,  H03H2017/0247 ,  H03H2017/0298 ,  H04L7/0029 ,  H04L7/005 ,  H04L7/0087

Abstract: A parallel transfer rate converter inputs first parallel data with number of samples being S1 pieces in synchronism with a first clock, and outputs second parallel data with number of samples being S2=S1×(m/p) pieces (p is an integer equal to or larger than 1) in synchronism with a second clock having a frequency which is p/m times of a frequency of the first clock. A convolution operation device inputs the second parallel data in synchronism with the second clock, generates third parallel data with number of samples being S3=S2×(n/m) pieces (S3 is an integer equal to or larger than 1) by executing a convolution operation with a coefficient indicating a transmission characteristic to the second parallel data, and outputs the third parallel data in synchronism with the second clock.

公开(公告)号：US20180152247A1

公开(公告)日：2018-05-31

申请号：US15575286

申请日：2016-09-05

Applicant: NTT ELECTRONICS CORPORATION ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Osamu ISHIDA ,  Etsushi YAMAZAKI ,  Kazuhito TAKEI ,  Masahito TOMIZAWA ,  Hideki NISHIZAWA

IPC: H04B10/516 ,  H04B10/40 ,  H04B10/60

CPC classification number: H04B10/516 ,  H04B10/40 ,  H04B10/50 ,  H04B10/60

Abstract: Signal processing sections selectively switch modulation/demodulation in low-efficiency modulation system and modulation/demodulation in high-efficiency modulation system, and perform digital signal processing. Parallel-side interfaces of input/output interface sections are electrically connected to the signal processing section. A serial-side interface of the input/output interface section is electrically connected to a serial-side interface of the input/output interface section. A selection section electrically connects a parallel-side interface of the input/output interface section to the signal processing section when the low-efficiency modulation system is selected, and electrically connects the parallel-side interface of the input/output interface section to a parallel-side interface of the input/output interface section when the high-efficiency modulation system is selected.

公开(公告)号：US20160065326A1

公开(公告)日：2016-03-03

申请号：US14778824

申请日：2014-03-14

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yoshiaki KISAKA ,  Koichi ISHIHARA ,  Masahito TOMIZAWA ,  Etsushi YAMAZAKI

IPC: H04J14/06 ,  H04B10/532 ,  H04B10/61

CPC classification number: H04J14/06 ,  H04B10/077 ,  H04B10/50 ,  H04B10/516 ,  H04B10/532 ,  H04B10/614 ,  H04B10/6162 ,  H04L27/2096

Abstract: An optical transmission and reception system includes a transmitter and receiver. The transmitter differentially encodes control information to generate a differentially coded signal; uses the differentially coded signal to modulate a signal sequence in which electricity concentrates at a particular frequency; applies time-division multiplexing on the modulated signal sequence and a primary signal in one of two polarized wave components, and applies time-division multiplexing on the other polarized wave components and the signal sequence itself; and polarization-multiplexes the both of the time-division multiplexed polarized waves into an optical signal; and transmits the optical signal to the receiver. The receiver polarization-demultiplexes the received optical signal to generate two polarized wave signals; extracts the signal sequence in which electricity concentrates at the particular frequency from the two polarized wave signals; and applies differential detection on the extracted signal sequence to demodulate the control information.

Abstract translation: 光传输和接收系统包括发射机和接收机。 发射机差分编码控制信息以产生差分编码的信号; 使用差分编码的信号来调制在特定频率集中电力的信号序列; 对调制信号序列和两个极化波分量之一的主信号进行时分复用，对其他极化波分量和信号序列本身进行时分复用; 并且将所述时分复用偏振波的两个偏振复用为光信号; 并将光信号发送到接收机。 接收机对所接收的光信号进行偏振解复用以产生两个偏振波信号; 从两个极化波信号中提取特定频率集中的信号序列; 对所提取的信号序列应用差分检测来解调控制信息。