公开(公告)号：US10432391B2

公开(公告)日：2019-10-01

申请号：US16031944

申请日：2018-07-10

Applicant: Samsung Electronics Co., Ltd.

Inventor： Farrokh Etezadi ,  Linbo Li ,  Chun Kin Au Yeung ,  Xiaoqiang Ma

IPC: H04L7/00 ,  H04L25/03 ,  H04L7/04

Abstract: A receiver of a modulated signal is presented. The receiver includes a synchronization detector configured to receive a signal indicative of the modulated signal that includes a synchronization header and a data payload, and to detect an end of the synchronization header. The synchronization detector is configured to generate a differential signal based on the signal, perform cross-correlation of the differential signal with a reference differential signal to generate a cross-correlation output, compare a first sample of the cross-correlation output at a sample index associated with a hypothesized start frame delimiter (SFD) peak index with a second sample of the cross-correlation output at a sample index associated with a hypothesized preamble peak index, and detect an end of the synchronization header in response to a comparison result in which a magnitude of the first sample is greater than a magnitude of the second sample of the cross-correlation output.

公开(公告)号：US10129014B2

公开(公告)日：2018-11-13

申请号：US15441149

申请日：2017-02-23

Applicant: Samsung Electronics Co., Ltd.

Inventor： Farrokh Etezadi ,  Linbo Li ,  Chun Kin Au Yeung ,  Xiaoqiang Ma

IPC: H04L7/00 ,  H04L25/03

Abstract: According to an embodiment of the present disclosure, a receiver of modulated signals comprises a signal mixer, a synchronization detector, and a data demodulator. The signal mixer is configured to perform baseband down-conversion of a signal according to a mixer frequency, the signal including a synchronization header and a data payload. The synchronization detector is configured to: generate a differential signal based on the signal, perform cross-correlation of the differential signal with a reference differential signal to generate a cross-correlation output, and analyze the cross-correlation output to detect an end of the synchronization header. The data demodulator is configured to demodulate the data payload in response to detection of the end of the synchronization header.

公开(公告)号：US10778300B2

公开(公告)日：2020-09-15

申请号：US16273632

申请日：2019-02-12

Applicant: Samsung Electronics Co., Ltd.

Inventor： Hyukjoon Kwon ,  Xiaoqiang Ma ,  Kee-Bong Song

IPC: H04B7/0456 ,  H04B7/08 ,  H04L1/00

Abstract: A method and an apparatus in a multiple-input multiple-output (MIMO) wireless communication system are provided. A signal is received over a channel. The channel is decomposed into a plurality of virtual channels. Symbol detection is performed on each of the plurality of virtual channels using respective symbol detectors. At least one of the symbol detectors has a lower rank than that of the channel. Output from the symbol detectors is combined to obtain final log likelihood ration (LLR) values for layers of the channel. Decoding is performed using the final LLR values to output a decoded symbol value of the received signal.

公开(公告)号：US10257012B2

公开(公告)日：2019-04-09

申请号：US15446673

申请日：2017-03-01

Applicant: Samsung Electronics Co., Ltd.

Inventor： Xiaoqiang Ma ,  Hongbing Cheng ,  Linbo Li ,  Jungwon Lee

IPC: H04L27/26

Abstract: The apparatus includes a plurality of correlation processors configured to each receive a group of samples and generate correlations of each group of samples; a plurality of multipliers each configured to multiply the correlations of one of the plurality of correlation processors by a weight, wherein the weight of at least one of the plurality of multipliers is different from the weight of at least another one of the plurality of multipliers; a summation processor configured to sum the weight multiplied correlations of the plurality of multipliers for time n, where n is an integer; and a coarse timing and coarse frequency processor configured to generate a coarse timing and a coarse frequency based on the sum.

公开(公告)号：US20180212749A1

公开(公告)日：2018-07-26

申请号：US15441149

申请日：2017-02-23

Applicant: Samsung Electronics Co., Ltd.

Inventor： Chun Kin Au Yeung ,  Farrokh Etezadi ,  Xiaoqiang Ma ,  Linbo Li

IPC: H04L7/00 ,  H04L25/03

CPC classification number: H04L7/0087 ,  H04L25/03019

Abstract: According to an embodiment of the present disclosure, a receiver of modulated signals comprises a signal mixer, a synchronization detector, and a data demodulator. The signal mixer is configured to perform baseband down-conversion of a signal according to a mixer frequency, the signal including a synchronization header and a data payload. The synchronization detector is configured to: generate a differential signal based on the signal, perform cross-correlation of the differential signal with a reference differential signal to generate a cross-correlation output, and analyze the cross-correlation output to detect an end of the synchronization header. The data demodulator is configured to demodulate the data payload in response to detection of the end of the synchronization header.

公开(公告)号：US20180323955A1

公开(公告)日：2018-11-08

申请号：US16031944

申请日：2018-07-10

Applicant: Samsung Electronics Co., Ltd.

Inventor： Farrokh Etezadi ,  Linbo Li ,  Chun Kin Au Yeung ,  Xiaoqiang Ma

IPC: H04L7/00 ,  H04L25/03

CPC classification number: H04L7/0087 ,  H04L7/042 ,  H04L25/03019

Abstract: A receiver of a modulated signal includes a synchronization detector configured to receive a signal indicative of the modulated signal and to detect an end of the synchronization header in the signal. The synchronization detector is configured to generate a differential signal based on the signal, perform cross-correlation of the differential signal with a reference differential signal to generate a cross-correlation output, compare a first sample of the cross-correlation output at a sample index associated with a hypothesized start frame delimiter (SFD) peak index with a second sample of the cross-correlation output at a sample index associated with a hypothesized preamble peak index, and detect an end of the synchronization header in response to a comparison result in which a magnitude of the first sample of the cross-correlation output is greater than a magnitude of the second sample of the cross-correlation output.

公开(公告)号：US11569881B2

公开(公告)日：2023-01-31

申请号：US17006088

申请日：2020-08-28

Applicant: Samsung Electronics Co., Ltd.

Inventor： Hyukjoon Kwon ,  Xiaoqiang Ma ,  Kee-Bong Song

IPC: H04B7/0456 ,  H04B7/08 ,  H04L1/00

Abstract: A method and an apparatus in a multiple-input multiple-output (MIMO) wireless communication system are provided. A signal is received over a channel. The channel is decomposed into a plurality of virtual channels. Symbol detection is performed on each of the plurality of virtual channels. Values are obtained for the channel. Decoding is performed using the values to output a decoded symbol value of the received signal.

公开(公告)号：US10079660B2

公开(公告)日：2018-09-18

申请号：US15433859

申请日：2017-02-15

Applicant: Samsung Electronics Co., Ltd.

Inventor： Chun Kin Au Yeung ,  Farrokh Etezadi ,  Xiaoqiang Ma ,  Linbo Li ,  Kee-Bong Song

IPC: H04L1/24 ,  H04L27/156 ,  H04L27/233 ,  H04L12/26 ,  H04L29/12

CPC classification number: H04L1/242 ,  H04L27/156 ,  H04L27/2337 ,  H04L61/6081

Abstract: According to an embodiment of the present disclosure, a receiver of modulated signals comprises a signal sampling unit configured to sample a signal, a zero-crossing demodulator, and a timing offset tracking unit. The zero-crossing demodulator includes: a zero-crossing counter configured to determine a number of zero crossings for each pulse of the signal, and a symbol selector configured to decode a sequence of pulses as a symbol based on the number of zero crossings in the sequence of pulses. The timing offset tracking unit is configured to: calculate a metric based on an accumulation of the number of zero crossings and corresponding pulse values of the decoded symbol, compare the metric to a predetermined threshold value, and compensate a timing offset of the signal by causing the signal sampling unit to sample the signal at an earlier interval or a later interval in response to the comparison.

公开(公告)号：US20180212724A1

公开(公告)日：2018-07-26

申请号：US15433859

申请日：2017-02-15

Applicant: Samsung Electronics Co., Ltd.

Inventor： Chun Kin Au Yeung ,  Farrokh Etezadi ,  Xiaoqiang Ma ,  Linbo Li ,  Kee-Bong Song

IPC: H04L1/24 ,  H04L27/156 ,  H04L27/233 ,  H04L12/26

CPC classification number: H04L1/242 ,  H04L27/156 ,  H04L27/2337 ,  H04L43/16

Abstract: According to an embodiment of the present disclosure, a receiver of modulated signals comprises a signal sampling unit configured to sample a signal, a zero-crossing demodulator, and a timing offset tracking unit. The zero-crossing demodulator includes: a zero-crossing counter configured to determine a number of zero crossings for each pulse of the signal, and a symbol selector configured to decode a sequence of pulses as a symbol based on the number of zero crossings in the sequence of pulses. The timing offset tracking unit is configured to: calculate a metric based on an accumulation of the number of zero crossings and corresponding pulse values of the decoded symbol, compare the metric to a predetermined threshold value, and compensate a timing offset of the signal by causing the signal sampling unit to sample the signal at an earlier interval or a later interval in response to the comparison.