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：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：AU2016203514A1

公开(公告)日：2016-06-16

申请号：AU2016203514

申请日：2016-05-27

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.

公开(公告)号：SG10201504527PA

公开(公告)日：2015-07-30

申请号：SG10201504527P

申请日：2011-08-26

Applicant: QUALCOMM INC

Inventor： SHI KAI ,  ZHANG NING

Abstract: In a multiple-input, multiple-output (MIMO) system, a wireless node's receive chain demodulation function is enhanced to include phase tracking. VHT Long Training Fields (LTFs) embedded in a frame preamble are used for phase tracking. Single stream pilot tones are added during transmission of VHT-LTFs. A receiver estimates the channel using the pilot tones in a first set of LTFs. A second set of LTFs are used to estimate the phase of the pilot tones using the estimated channel. The phase estimation is continuously applied to other received data tones throughout the VHT-LTFs of data symbols. Phase errors due to PLL mismatches and phase noise are reduced at reception, leading to better signal to noise ratio for different levels of drift and frequency offset. Further, MIMO channel estimation is more accurate, improving the overall wireless network when the accurate MIMO channel estimation data participates in calibration and handshake between wireless nodes.

公开(公告)号：AU2011293191B2

公开(公告)日：2015-03-26

申请号：AU2011293191

申请日：2011-08-26

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.

公开(公告)号：UA106439C2

公开(公告)日：2014-08-26

申请号：UAA201303635

申请日：2011-08-26

Applicant: QUALCOMM INC

Inventor： SHI KAI ,  ZHANG NING

IPC: H04L7/00

公开(公告)号：UA106311C2

公开(公告)日：2014-08-11

申请号：UAA201304508

申请日：2011-09-16

Applicant: QUALCOMM INC

Inventor： SHI KAI ,  ZHANG NING

IPC: H03M13/00

Abstract: Представленысистемаи способдляпередачи LDPC-параметров. Способзаключаетсяв том, чтодляпакетаопределяетсяисходноечисло OFDM-символов (Nsym_init), основанноеначислеинформационныхбитов, которыедолжныдоставлятьсяв пакете. Такжеопределяется STBC-значение. Значениечисладополнительныхсимволов (Nsym_ext) формируетсянаосновезначения Nsym_init, приэтомзначение Nsym основанонаупомянутомзначении Nsym_init иупомянутомзначении Nsym_ext. Значение Nldpc_ext определяетсянаоснове STBC-значенияи значения Nsym_ext сцельюопределения LDPC-параметров, ассоциированныхс пакетом.