Wireless Preamble Generation for Multi-Terminal Channel Estimation
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Solution Overview
Problem
Conventional IEEE 802.11 wireless communication systems lack a standard preamble structure for channel-state estimation in cooperative communication systems, particularly when multiple terminals need to be discriminated, limiting their ability to efficiently support a large number of terminals and expand service areas.
Innovation Solution
A preamble generation method and apparatus that generates modified sequences by combining base sequences, antenna channel estimation sequences, and control sequences, allocating them to frequency domains for effective channel estimation across multiple stations, thereby enabling channel estimation for multiple stations simultaneously and minimizing the impact of changes in the number of communicating stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a standard preamble structure for channel-state estimation is used in conventional IEEE 802.11 systems, then the system maintains compatibility with existing standards, but it cannot effectively discriminate multiple terminals or support a large number of terminals in cooperative communication systems
Solution Approach 1:
The preamble is segmented into multiple distinct sequences: base sequence, antenna channel estimation sequence, and control sequence. Each sequence serves a specific function in discriminating terminals and estimating channels, allowing the system to handle multiple terminals effectively while maintaining manageable complexity through functional division
Solution Approach 2:
The preamble structure is designed to serve multiple functions simultaneously: terminal discrimination, channel-state estimation, and support for varying numbers of terminals. The control sequence specifically enables the system to adapt to different numbers of terminals without requiring separate preamble designs for each scenario
2Measurement precision
If the channel-state estimation sequence is increased to discriminate multiple terminals, then terminal discrimination capability improves, but the preamble structure becomes too long for conventional IEEE 802.11 systems to accommodate
Solution Approach 1:
Multiple sequences (base sequence, antenna channel estimation sequence, and control sequence) are merged into a unified preamble structure. This combination allows the preamble to convey multiple types of information simultaneously, achieving accurate channel-state estimation for multiple terminals without requiring a proportionally increased preamble length
Solution Approach 2:
The control sequence introduces parameter variations that enable the preamble to adapt to different numbers of terminals. By changing parameters within the existing structure rather than extending the overall length, the system maintains compatibility with conventional IEEE 802.11 preamble length constraints while achieving enhanced estimation accuracy
3Productivity
If fewer resources are used to support a large number of terminals, then frequency efficiency improves, but the system lacks the capability to perform effective channel estimation for multiple terminals simultaneously
Solution Approach 1:
The patent introduces a control sequence dimension that enables the preamble to handle multiple terminals without requiring proportional increases in time or frequency resources. This additional dimensional approach allows efficient resource utilization while maintaining reliable channel estimation across multiple terminals through structured sequence design
Data Source
AI summary
A preamble generation method of a station includes: generating a base sequence for channel estimation; generating an antenna channel estimation sequence for at least one or more antennas of the station; generating a preamble by allocating at least one or more modified sequences to frequency domains for at least one or time periods. The modified sequences are generated by using the base sequence, the antenna channel estimation sequence, and a control sequence for estimating at least one or more channels.