Packet Preamble Design for mmWave Signal Detection and Channel Estimation
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Solution Overview
Problem
Millimeter-wave (mmWave) communication links, particularly in the 60GHz band, are less robust due to high attenuation and sensitivity to mobility, making them less reliable for high-data-rate applications like video streaming and Internet access, especially when using directional antennas.
Innovation Solution
A wireless communication system that uses a packet preamble with detection, synchronization, and channel estimation fields, employing π/2-BPSK modulation and sequences like PN or Golay codes, which can be filtered and resampled for both single-carrier and OFDM transmissions, to enhance signal detection and channel estimation across devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If directional antennas are used to increase communication range, then communication range is improved, but mobility tolerance deteriorates
Solution Approach 1:
The packet preamble is segmented into multiple functional fields (detection field, synchronization field, channel estimation field) that can be independently processed. This segmentation allows the receiver to efficiently detect and synchronize with the signal even when using directional antennas, thereby improving mobility tolerance while maintaining communication range.
Solution Approach 2:
The packet preamble contains preliminary synchronization sequences and channel estimation information that are prepared in advance. This preliminary action enables the receiver to quickly acquire and track the signal before actual data transmission, making the system more tolerant to mobility changes while maintaining extended communication range through directional antennas.
2Measurement precision
If packet preamble with detection and synchronization fields is used, then signal detection capability is improved, but device complexity increases
Solution Approach 1:
The packet preamble structure is designed to serve multiple functions simultaneously: the detection field enables signal detection, the synchronization field provides timing synchronization, and the channel estimation field facilitates channel characterization. This multi-functionality improves signal detection capability without requiring separate structures for each function, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent employs π/2-BPSK modulation and specific sequence structures (PN or Golay codes) in the packet preamble fields. These parameter choices optimize the detection capability while maintaining reasonable complexity by leveraging well-understood signal processing techniques rather than requiring novel complex algorithms.
Data Source
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AI summary
A wireless communication device, a wireless communication system and a method for transmitting a packet preamble of signal sequences to both a single carrier wireless device and a multiple carrier wireless device. The packet preamble includes a first sequence for detecting a signal and a second sequence for estimating a channel.