Patents by Inventor Cheng-Chou Lan
Cheng-Chou Lan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Publication number: 20220138566Abstract: A learning system comprising at least one processor configured to: obtain training data to be learned by a learning model; and repeatedly execute a learning process of the learning model based on the training data, wherein the at least one processor quantizes a parameter of a part of layers of the learning model and executes the learning process, and then quantizes parameters of other layers of the learning model and executes the learning process.Type: ApplicationFiled: August 29, 2019Publication date: May 5, 2022Applicant: Rakuten Group, Inc.Inventor: Cheng-Chou LAN
-
Patent number: 9363677Abstract: A device includes a signaling interface to receive OFDM signaling for an OFDM channel from a plurality of transmit nodes and an OFDM receiver process the OFDM signaling. The device further includes a channel allocation module to determine, for each transmit node, a corresponding SNR for each of a plurality of subchannels of the channel and to allocate, to each transmit node of the plurality of transmit nodes, a corresponding subset of subchannels of the plurality of subchannels. The channel allocation module further is to select, for each subset of subchannels, one or more subchannels for use as pilots by the corresponding transmit node based on the SNRs of the subchannels in the subset. The device further includes an OFDM transmitter to transmit configuration information to the plurality of transmit nodes, the configuration information representing the allocation of the subchannels and the selection of subchannels for use as pilots.Type: GrantFiled: March 18, 2014Date of Patent: June 7, 2016Assignee: VIXS Systems Inc.Inventor: Cheng-Chou Lan
-
Patent number: 9363703Abstract: A device includes a signaling interface to receive OFDM signaling for an OFDM channel from multiple transmit nodes, an OFDM receiver to process the OFDM signaling, and a channel allocation module. The channel allocation module allocates subchannels of the channel among transmit nodes by: determining, for each transmit node, a corresponding SNR for each of the subchannels; assigning to each transmit node a corresponding subset of buckets of a set of buckets, the number of buckets in the subset based on a data rate requirement of the transmit node; distributing subchannels among the buckets based on the SNRs of the subchannels; and, for each transmit node, allocating to the transmit node the subchannels distributed to the subset of buckets assigned to the transmit node. The device further includes an OFDM transmitter to transmit configuration information to the transmit nodes, the configuration information representing the allocation of the subchannels.Type: GrantFiled: March 18, 2014Date of Patent: June 7, 2016Assignee: VIXS Systems Inc.Inventor: Cheng-Chou Lan
-
Patent number: 9306716Abstract: A carrier tracking technique includes allocating a first number of bits per symbol to a carrier tracking subcarrier of a plurality of subcarriers of an orthogonal frequency division multiplexing (OFDM) signal based on a first target performance margin. The technique includes allocating numbers of bits per symbol to other subcarriers of the plurality of subcarriers based on a second target performance margin.Type: GrantFiled: July 14, 2014Date of Patent: April 5, 2016Assignee: ViXS Systems, Inc.Inventors: Cimarron Mittelsteadt, Cheng-Chou Lan
-
Patent number: 9184942Abstract: An automatic gain control technique generates one or more gain control signals based on a known sequence of samples received in a preamble of a packet received over a particular communications link and generates one or more adjusted gain control signals based on a previously unknown sequence of samples received in a payload of a packet. In at least one embodiment of the gain control technique, time domain samples of the preamble of a symbol are used to generate the one or more gain control signals. In at least one embodiment of the gain control technique, frequency domain samples are used to generate the one or more adjusted gain control signals. The one or more gain control signals include digital and/or analog gain control signals that are provided to digital signal processing modules and/or analog circuits in an interface circuit, respectively, to adjust the gain applied to a received signal.Type: GrantFiled: January 9, 2012Date of Patent: November 10, 2015Assignee: ViXS Systems, Inc.Inventors: Cheng-Chou Lan, Cimarron Mittelsteadt
-
Publication number: 20150271699Abstract: A device includes a signaling interface to receive OFDM signaling for an OFDM channel from multiple transmit nodes, an OFDM receiver to process the OFDM signaling, and a channel allocation module. The channel allocation module allocates subchannels of the channel among transmit nodes by: determining, for each transmit node, a corresponding SNR for each of the subchannels; assigning to each transmit node a corresponding subset of buckets of a set of buckets, the number of buckets in the subset based on a data rate requirement of the transmit node; distributing subchannels among the buckets based on the SNRs of the subchannels; and, for each transmit node, allocating to the transmit node the subchannels distributed to the subset of buckets assigned to the transmit node. The device further includes an OFDM transmitter to transmit configuration information to the transmit nodes, the configuration information representing the allocation of the subchannels.Type: ApplicationFiled: March 18, 2014Publication date: September 24, 2015Applicant: VIXS SYSTEMS INC.Inventor: Cheng-Chou Lan
-
Publication number: 20150271832Abstract: A device includes a signaling interface to receive OFDM signaling for an OFDM channel from a plurality of transmit nodes and an OFDM receiver process the OFDM signaling. The device further includes a channel allocation module to determine, for each transmit node, a corresponding SNR for each of a plurality of subchannels of the channel and to allocate, to each transmit node of the plurality of transmit nodes, a corresponding subset of subchannels of the plurality of subchannels. The channel allocation module further is to select, for each subset of subchannels, one or more subchannels for use as pilots by the corresponding transmit node based on the SNRs of the subchannels in the subset. The device further includes an OFDM transmitter to transmit configuration information to the plurality of transmit nodes, the configuration information representing the allocation of the subchannels and the selection of subchannels for use as pilots.Type: ApplicationFiled: March 18, 2014Publication date: September 24, 2015Applicant: VIXS SYSTEMS INC.Inventor: Cheng-Chou Lan
-
Patent number: 9008195Abstract: A technique detects the presence of a packet identification sequence in a received sequence of samples received over a communications network. The packet identification sequence, when present and properly detected in a received packet, is used to determine a particular type of the received packet from a plurality of packet types that may be received over the communications network. The technique for detecting the packet identification sequence includes detecting a null sequence in the received packet and a predetermined identification sequence in the packet. Detection of the predetermined sequence uses energy estimates for corresponding windows of received samples.Type: GrantFiled: January 9, 2012Date of Patent: April 14, 2015Assignee: ViXS Systems, Inc.Inventors: Cheng-Chou Lan, Cimarron Mittelsteadt
-
Patent number: 8971463Abstract: A method includes generating representative noise variance estimates based on a plurality of received symbols received in an orthogonal frequency division multiplexing (OFDM) signal. The representative noise variance estimates correspond to respective frequency intervals of a plurality of frequency intervals of the OFDM channel. Individual frequency intervals of the plurality of frequency intervals include a plurality of contiguous frequency bins of the OFDM signal.Type: GrantFiled: November 18, 2011Date of Patent: March 3, 2015Assignee: ViXS Systems, Inc.Inventors: Cimarron Mittelsteadt, Cheng-Chou Lan
-
Publication number: 20140321403Abstract: A carrier tracking technique includes allocating a first number of bits per symbol to a carrier tracking subcarrier of a plurality of subcarriers of an orthogonal frequency division multiplexing (OFDM) signal based on a first target performance margin. The technique includes allocating numbers of bits per symbol to other subcarriers of the plurality of subcarriers based on a second target performance margin.Type: ApplicationFiled: July 14, 2014Publication date: October 30, 2014Inventors: Cimarron Mittelsteadt, Cheng-Chou Lan
-
Patent number: 8780838Abstract: A carrier tracking technique includes allocating a first number of bits per symbol to a carrier tracking subcarrier of a plurality of subcarriers of an orthogonal frequency division multiplexing (OFDM) signal based on a first target performance margin. The technique includes allocating numbers of bits per symbol to other subcarriers of the plurality of subcarriers based on a second target performance margin.Type: GrantFiled: November 18, 2011Date of Patent: July 15, 2014Assignee: ViXS Systems, Inc.Inventors: Cimarron Mittelsteadt, Cheng-Chou Lan
-
Publication number: 20130177112Abstract: An automatic gain control technique generates one or more gain control signals based on a known sequence of samples received in a preamble of a packet received over a particular communications link and generates one or more adjusted gain control signals based on a previously unknown sequence of samples received in a payload of a packet. In at least one embodiment of the gain control technique, time domain samples of the preamble of a symbol are used to generate the one or more gain control signals. In at least one embodiment of the gain control technique, frequency domain samples are used to generate the one or more adjusted gain control signals. The one or more gain control signals include digital and/or analog gain control signals that are provided to digital signal processing modules and/or analog circuits in an interface circuit, respectively, to adjust the gain applied to a received signal.Type: ApplicationFiled: January 9, 2012Publication date: July 11, 2013Inventors: Cheng-Chou Lan, Cimarron Mittelsteadt
-
Publication number: 20130177088Abstract: A technique detects the presence of a packet identification sequence in a received sequence of samples received over a communications network. The packet identification sequence, when present and properly detected in a received packet, is used to determine a particular type of the received packet from a plurality of packet types that may be received over the communications network. The technique for detecting the packet identification sequence includes detecting a null sequence in the received packet and a predetermined identification sequence in the packet. Detection of the predetermined sequence uses energy estimates for corresponding windows of received samples.Type: ApplicationFiled: January 9, 2012Publication date: July 11, 2013Inventors: Cheng-Chou Lan, Cimarron Mittelsteadt
-
Publication number: 20130128822Abstract: A carrier tracking technique includes allocating a first number of bits per symbol to a carrier tracking subcarrier of a plurality of subcarriers of an orthogonal frequency division multiplexing (OFDM) signal based on a first target performance margin. The technique includes allocating numbers of bits per symbol to other subcarriers of the plurality of subcarriers based on a second target performance margin.Type: ApplicationFiled: November 18, 2011Publication date: May 23, 2013Inventors: Cimarron Mittelsteadt, Cheng-Chou Lan
-
Publication number: 20130128995Abstract: A method includes generating representative noise variance estimates based on a plurality of received symbols received in an orthogonal frequency division multiplexing (OFDM) signal. The representative noise variance estimates correspond to respective frequency intervals of a plurality of frequency intervals of the OFDM channel. Individual frequency intervals of the plurality of frequency intervals include a plurality of contiguous frequency bins of the OFDM signal.Type: ApplicationFiled: November 18, 2011Publication date: May 23, 2013Inventors: Cimarron Mittelsteadt, Cheng-Chou Lan