Invention Grant
- Patent Title: Single stream phase tracking during channel estimation in a very high throughput wireless MIMO communication system
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Application No.: US15450773Application Date: 2017-03-06
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Publication No.: US09832064B2Publication Date: 2017-11-28
- Inventor: Kai Shi , Ning Zhang
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Paradice and Li LLP
- Main IPC: H04L27/26
- IPC: H04L27/26 ; H04B7/0413 ; H04L25/02

Abstract:
In MIMO a wireless node's receive chain demodulation function is enhanced to include phase tracking using very high-throughput long training fields (VHT-LTFs) embedded in a frame preamble. 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 VHT-LTFs, and estimates the phase of the pilot tones using a second set of VHT-LTFs. The phase estimation receiver estimates the channel using the pilot tones in a first set of VHT-LTFs. 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.
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