Packet Bandwidth Detection via Preamble Sign Patterns
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Solution Overview
Problem
Conventional methods fail to detect bandwidth and packet type of packets before channel estimation in IEEE 802.11aj specifications, necessitating parallel decoding for multiple possible packet formats.
Innovation Solution
An electronic apparatus comprising a symbol detecting circuit, a sign pattern generating circuit, and a determining circuit that detects symbols in a packet preamble to generate a sign pattern, determining the bandwidth and packet type based on this pattern, allowing for automatic detection without parallel decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used for packet detection, then channel estimation can be performed, but bandwidth and packet type cannot be detected before channel estimation, requiring parallel decoding for multiple packet formats
Solution Approach 1:
The patent applies preliminary action by detecting bandwidth and packet type before channel estimation and decoding operations. The method extracts sign patterns from training fields in the packet preamble, determines bandwidth based on the number of non-zero subcarriers, and identifies packet type based on the sign pattern characteristics, all before performing channel estimation or decoding. This preliminary detection eliminates the need for parallel decoding of multiple packet formats.
Solution Approach 2:
The patent extracts the bandwidth and packet type information from the sign patterns present in the training fields of the packet preamble. By taking out this information before channel estimation and decoding, the system avoids the complexity of parallel decoding while maintaining accurate detection. The extraction is performed by analyzing the sign patterns of specific training fields without requiring full packet decoding.
2Adaptability or versatility
If parallel decoding for multiple packet formats is performed, then all packet types can be handled, but processing time and computational resources increase
Solution Approach 1:
The patent performs preliminary detection of packet type and bandwidth before decoding by analyzing sign patterns in training fields. This allows the receiver to identify the specific packet format early in the reception process, enabling single-format decoding instead of parallel decoding for multiple formats. The preliminary action maintains adaptability to different packet types while significantly reducing processing time.
Solution Approach 2:
The patent performs partial action by detecting only the essential characteristics (sign patterns in training fields) needed to identify packet type and bandwidth, rather than performing complete decoding of all possible packet formats. This partial detection provides sufficient information to handle the specific packet format efficiently without the excessive computational effort of parallel decoding.
3Reliability
If channel estimation is performed without prior bandwidth detection, then channel estimation can be executed, but it must be performed on maximum transmission bandwidth rather than occupied bandwidth
Solution Approach 1:
The patent performs preliminary bandwidth detection by analyzing sign patterns in training fields before channel estimation. By determining the occupied bandwidth early based on the number of non-zero subcarriers indicated by the sign pattern, the system can perform channel estimation only on the necessary bandwidth, improving both accuracy and efficiency compared to estimating on maximum transmission bandwidth.
Data Source
AI summary
The present invention provides a method and an electronic apparatus for automatically detecting bandwidth and the packet type of a packet, so as to solve the problem mentioned above. The method comprises: detecting a plurality of symbols in the preamble of the packet; generating a sign pattern according to the symbols; and determining the bandwidth and the packet type of the packet according to the detected sign pattern. The electronic apparatus comprises: a symbol detecting circuit, a sign pattern generating circuit, and a determining circuit. The symbol detecting circuit is utilized for detecting a plurality of symbols in the preamble of the packet. The sign pattern generating circuit is utilized for generating a sign pattern according to the symbols. The determining circuit is utilized for determining the bandwidth and the packet type of the packet according to the detected sign pattern.