公开(公告)号：US11451329B2

公开(公告)日：2022-09-20

申请号：US17157691

申请日：2021-01-25

申请人： Jianhong Ke ,  Chuandong Li ,  Xuefeng Tang

发明人： Jianhong Ke ,  Chuandong Li ,  Xuefeng Tang

IPC分类号： H04L1/00

摘要： Methods and systems for performing signal pre-correction of a transmission signal comprising a sequence of symbols using a Pattern Dependent Look-up Table (PDLUT) containing one or more distortion correction values. Upon accessing a distortion correction value from the PDLUT for a symbol of the sequence of symbols, the accessed distortion correction value is quantized into one or more quantized values according to one or more quantizations, thereby reducing the bit-width of the distortion correction value. The transmission signal and the distortion correction value with reduced bit-width may undergo linear correction compensation, such as through a finite impulse response (FIR) filter, independent of one another, where the one or more quantized correction values with reduced bit-width reduce a number of calculation steps performed during linear correction compensation resulting in power savings. The linearly compensated quantized values and the linearly compensated signal are combined to form a pre-corrected signal.

公开(公告)号：US11108599B1

公开(公告)日：2021-08-31

申请号：US16936098

申请日：2020-07-22

申请人： Chuandong Li ,  Jianhong Ke

发明人： Chuandong Li ,  Jianhong Ke

IPC分类号： H04L25/03 ,  H04B10/61

摘要： Methods and devices are described for frequency domain equalization with low complexity and loop delay. A transmitter inserts pilot symbols into a data signal at intervals of every n data bits. These pilot symbols are used by a receiver-side frequency-domain equalizer to calculate error levels and equalize the received data signal to effect impairment compensation such as SOP tracking. QPSK or BPSK symbols may be used for the pilot symbols, simplifying error calculation into an addition operation instead of the conventional multiplication operation required by conventional FDEQs. Equalizers are described that may operate in a pilot-assisted mode, a conventional decision-directed mode, or both.

公开(公告)号：US11038598B1

公开(公告)日：2021-06-15

申请号：US16801608

申请日：2020-02-26

申请人： Jianhong Ke ,  Chuandong Li

发明人： Jianhong Ke ,  Chuandong Li

IPC分类号： H04B10/40 ,  H04B10/61 ,  H04B3/32

摘要： Aspects of the present application provide methods and devices for compensating crosstalk in in the digital domain, the crosstalk occurring in the analog domain, for an optical coherent transceiver on a photonic integrated circuit (PIC).

公开(公告)号：US09941960B2

公开(公告)日：2018-04-10

申请号：US15189330

申请日：2016-06-22

申请人： Zhiping Jiang ,  Jianhong Ke

发明人： Zhiping Jiang ,  Jianhong Ke

IPC分类号： H04B17/00 ,  H04B10/079 ,  H04B10/54 ,  H04J14/02

CPC分类号： H04B10/07955 ,  H04B10/077 ,  H04B10/0775 ,  H04B10/541 ,  H04B2210/075 ,  H04J14/021

摘要： An aspect of the disclosure provides methods and systems for encoding a data bit stream onto a pilot tone signal. Another aspect of the disclosure provides method and systems for pilot tone detection. In both, a coded pilot tone signal is encoded using a code sequence m1 for each bit value of 1 (b1) and a code sequence m0 for each bit value of 0 (b0) of a data bit stream including pilot tone data bit values of 1 (b1) and bit values of 0 (b0), with each code sequence having multiple coding bits in the duration of each bit. Pilot tone detection can further include decoding each code sequence of the coded pilot tone signal using a plurality of successive overlapping measurement windows. In some embodiments each measurement window is of the same duration, being of the duration of each code sequence, and detecting each code sequence comprises selecting one of the plurality of measurement windows to represent a complete code sequence.