公开(公告)号：SG188523A1

公开(公告)日：2013-04-30

申请号：SG2013018312

申请日：2011-09-16

Applicant: QUALCOMM INC

Inventor： SHI KAI ,  ZHANG NING

Abstract: A system and method for transmitting LDPC parameters is provided. In the method, an initial number of OFDM symbols (Nsym_init) is determined for a packet that is based on the number of information bits to be delivered in the packet. An STBC value is also determined. A number of extra symbols (Nsym_ext) value is generated based on the Nsym_init value, wherein a Nsym value is based on said Nsym_init value and said Nsym_ext value. An Nldpc_ext value is determined based on the STBC value and the Nsym_ext value for purposes of determining LDPC parameters associated with the packet.

公开(公告)号：WO2012092162A3

公开(公告)日：2013-04-25

申请号：PCT/US2011067046

申请日：2011-12-22

Applicant: QUALCOMM INC ,  SU CHI-LIN ,  ZHANG NING

Inventor： SU CHI-LIN ,  ZHANG NING

IPC: H04L23/02 ,  H04B1/7097 ,  H04L25/03 ,  H04L27/00 ,  H04L27/26

CPC classification number: H04L23/02 ,  H04B1/7097 ,  H04L25/03159 ,  H04L27/0006 ,  H04L27/0012 ,  H04L27/2647 ,  H04L2025/03426

Abstract: An adjacent channel interference rejection mechanism is provided to detect and reject CCK-modulated signals from an adjacent channel in a wireless communication receiver. Replicas of the baseband signals are frequency-shifted and then analyzed through a series of correlations to compare the power of the correlation outputs. An adjacent channel interference of a CCK-modulated signal is determined and rejected based on the comparisons meeting a predetermined tolerance level.

Abstract translation: 提供了一种相邻信道干扰抑制机制，用于在无线通信接收机中检测和拒绝来自相邻信道的CCK调制信号。 基带信号的副本被频移，然后通过一系列相关性进行分析，以比较相关输出的功率。 基于满足预定公差等级的比较，确定并拒绝CCK调制信号的相邻信道干扰。

公开(公告)号：MY192497A

公开(公告)日：2022-08-24

申请号：MYPI2016001892

申请日：2011-08-26

Applicant: QUALCOMM INC

Inventor： SHI KAI ,  ZHANG NING

IPC: H04L1/06 ,  H04L7/00

Abstract: In a multiple-input, multiple-output system, the wireless node?s receive chain demodulation function is enhanced to include phase tracking (501). Instead of performing phase tracking during the data symbols which is cumbersome for very high throughput wireless networks, the VHT Long Training Fields (LTFs) embedded in the preamble of a frame are used for phase tracking. Single stream pilot tones (601) are added during the transmission of VHT-LTFs. This is exploited on the receive side to be able to estimate the channel using the pilot tones in the first set of the Long Training Fields. Second set of the Long Training Fields are then used to estimate the phase of the pilot tones using the estimated channel. The phase estimation so obtained is continuously applied to other received data tones (602) throughout the VHT-LTFs of the data symbols. The phase errors due to PLL mismatches and phase noise are reduced at reception, leading to better signal to noise ratio for different levels of parts per million drift and offset in frequency. Further, MIMO channel estimation (504) is more accurate, which improves the overall wireless network when this accurate MIMO channel estimation data participates in calibration and handshake between wireless nodes. (Figure 2)

公开(公告)号：HUE048337T2

公开(公告)日：2020-07-28

申请号：HUE18151557

申请日：2013-09-11

Applicant: QUALCOMM INC

Inventor： DU SHU ,  JIA ZHANFENG ,  ZHANG NING ,  GAO QINGHAI ,  SRINIVASAN BABU BALAJI

IPC: H04B7/04 ,  H04B7/06 ,  H04L5/00 ,  H04W72/12

公开(公告)号：HUE044872T2

公开(公告)日：2019-11-28

申请号：HUE16726236

申请日：2016-05-12

Applicant: QUALCOMM INC

Inventor： JIA ZHANFENG ,  CHO JAMES ,  KUMAR SUMEET ,  HOMCHAUDHURI SANDIP ,  O'DONNELL IAN ,  ZHANG NING ,  RAISSINIA ALIREZA

IPC: H04W52/02 ,  H04W72/12

公开(公告)号：MY159915A

公开(公告)日：2017-02-15

申请号：MYPI2013000540

申请日：2011-08-26

Applicant: QUALCOMM INC

Inventor： SHI KAI ,  ZHANG NING

IPC: H04L7/00 ,  H04L1/06

Abstract: [0050] IN A MULTIPLE-INPUT, MULTIPLE-OUTPUT SYSTEM, THE WIRELESS NODE’S RECEIVE CHAIN DEMODULATION FUNCTION IS ENHANCED TO INCLUDE PHASE TRACKING. INSTEAD OF PERFORMING PHASE TRACKING DURING THE DATA SYMBOLS WHICH IS CUMBERSOME FOR VERY HIGH THROUGHPUT WIRELESS NETWORKS, THE VHT LONG TRAINING FIELDS (LTFS) EMBEDDED IN THE PREAMBLE OF A FRAME ARE USED FOR PHASE TRACKING. SINGLE STREAM PILOT TONES ARE ADDED DURING THE TRANSMISSION OF VHT-LTFS. THIS IS EXPLOITED ON THE RECEIVE SIDE TO BE ABLE TO ESTIMATE THE CHANNEL USING THE PILOT TONES IN THE FIRST SET OF THE LONG TRAINING FIELDS. SECOND SET OF THE LONG TRAINING FIELDS ARE THEN USED TO ESTIMATE THE PHASE OF THE PILOT TONES USING THE ESTIMATED CHANNEL. THE PHASE ESTIMATION SO OBTAINED IS CONTINUOUSLY APPLIED TO OTHER RECEIVED DATA TONES THROUGHOUT THE VHT-LTFS OF THE DATA SYMBOLS. THE PHASE ERRORS DUE TO PLL MISMATCHES AND PHASE NOISE ARE REDUCED AT RECEPTION, LEADING TO BETTER SIGNAL TO NOISE RATIO FOR DIFFERENT LEVELS OF PARTS PER MILLION DRIFT AND OFFSET IN FREQUENCY. FURTHER, MIMO CHANNEL ESTIMATION IS MORE ACCURATE, WHICH IMPROVES THE OVERALL WIRELESS NETWORK WHEN THIS ACCURATE MIMO CHANNEL ESTIMATION DATA PARTICIPATES IN CALIBRATION AND HANDSHAKE BETWEEN WIRELESS NODES.

公开(公告)号：AU2015201185B2

公开(公告)日：2016-06-23

申请号：AU2015201185

申请日：2015-03-06

Applicant: QUALCOMM INC

Inventor： SHI KAI ,  ZHANG NING

IPC: H04L7/00

Abstract: In a multiple-input, multiple-output system, the wireless node's receive chain demodulation function is enhanced to include phase tracking. Instead of performing phase tracking during the data symbols which is cumbersome for very high throughput wireless networks, the VHT Long Training Fields (LTFs) embedded in the preamble of a frame are used for phase tracking. Single stream pilot tones are added during the transmission of VHT- LTFs. This is exploited on the receive side to be able to estimate the channel using the pilot tones in the first set of the Long Training Fields. Second set of the Long Training Fields are then used to estimate the phase of the pilot tones using the estimated channel. The phase estimation so obtained is continuously applied to other received data tones throughout the VHT-LTFs of the data symbols. The phase errors due to PLL mismatches and phase noise are reduced at reception, leading to better signal to noise ratio for different levels of parts per million drift and offset in frequency. Further, MIMO channel estimation is more accurate, which improves the overall wireless network when this accurate MIMO channel estimation data participates in calibration and handshake between wireless nodes. STAG5 150 STAN BASE STA STA4_. TYPICAL WIRELESS LAN NETWORK AT HOME OR BUSINESS

公开(公告)号：SG10201507661RA

公开(公告)日：2015-10-29

申请号：SG10201507661R

申请日：2011-09-16

Applicant: QUALCOMM INC

Inventor： SHI KAI ,  ZHANG NING

Abstract: A system and method for transmitting LDPC parameters is provided. In the method, an initial number of OFDM symbols (Nsym_init) is determined for a packet that is based on the number of information bits to be delivered in the packet. An STBC value is also determined. A number of extra symbols (Nsym_ext) value is generated based on the Nsym_init value, wherein a Nsym value is based on said Nsym_init value and said Nsym_ext value. An Nldpc_ext value is determined based on the STBC value and the Nsym_ext value for purposes of determining LDPC parameters associated with the packet.

公开(公告)号：AU2015201185A1

公开(公告)日：2015-04-16

申请号：AU2015201185

申请日：2015-03-06

Applicant: QUALCOMM INC

Inventor： SHI KAI ,  ZHANG NING

IPC: H04L7/00

Abstract: In a multiple-input, multiple-output system, the wireless node's receive chain demodulation function is enhanced to include phase tracking. Instead of performing phase tracking during the data symbols which is cumbersome for very high throughput wireless networks, the VHT Long Training Fields (LTFs) embedded in the preamble of a frame are used for phase tracking. Single stream pilot tones are added during the transmission of VHT- LTFs. This is exploited on the receive side to be able to estimate the channel using the pilot tones in the first set of the Long Training Fields. Second set of the Long Training Fields are then used to estimate the phase of the pilot tones using the estimated channel. The phase estimation so obtained is continuously applied to other received data tones throughout the VHT-LTFs of the data symbols. The phase errors due to PLL mismatches and phase noise are reduced at reception, leading to better signal to noise ratio for different levels of parts per million drift and offset in frequency. Further, MIMO channel estimation is more accurate, which improves the overall wireless network when this accurate MIMO channel estimation data participates in calibration and handshake between wireless nodes. STAG5 150 STAN BASE STA STA4_. TYPICAL WIRELESS LAN NETWORK AT HOME OR BUSINESS

公开(公告)号：MY187788A

公开(公告)日：2021-10-23

申请号：MYPI2015000989

申请日：2011-08-26

Applicant: QUALCOMM INC

Inventor： SHI KAI ,  ZHANG NING

IPC: H04L7/00 ,  H04L25/02 ,  H04L27/26 ,  H04L27/28

Abstract: In a multiple-input, multiple-output system, the wireless node's receive chain demodulation function is enhanced to include phase tracking (501). Instead of performing phase tracking during the data symbols which is cumbersome for very high throughput wireless networks, the VHT Long Training Fields (LTFs) embedded in the preamble of a frame are used for phase tracking. Single stream pilot tones (601) are added during the transmission of VHT- LTFs. This is exploited on the receive side to be able to estimate the channel using the pilot tones in the first set of the Long Training Fields. Second set of the Long Training Fields are then used to estimate the phase of the pilot tones using the estimated channel. The phase estimation so obtained is continuously applied to other received data tones (602) throughout the VHT-LTFs of the data symbols. The phase errors due to PLL mismatches and phase noise are reduced at reception, leading to better signal to noise ratio for different levels of parts per million drift and offset in frequency. Further, MIMO channel estimation (504) is more accurate, which improves the overall wireless network when this accurate MIMO channel estimation data participates in calibration and handshake between wireless nodes. (Figure 5)