WLAN Preamble Transmit Power Enhancement for Throughput
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Solution Overview
Problem
Wireless local area networks (WLANs) face challenges in enhancing overall throughput rates and user experience due to limitations in data transmission performance, particularly in systems using IEEE 802.11 standards like 802.11n and 802.11ac, where peak-to-average power ratio (PAPR) issues affect transmit power amplification and channel estimation accuracy.
Innovation Solution
Implementing transmit power enhancement processing on non-legacy fields of the preamble in WLAN systems, where power enhancement information is added to indicate the power amplification amount, allowing for improved baseband signal generation and multi-input multi-output (MIMO) channel estimation, thereby enhancing system throughput and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmit power enhancement processing is performed on non-legacy fields of preamble, then overall throughput rate is improved, but device complexity increases
Solution Approach 1:
The patent segments the preamble into legacy fields and non-legacy fields, applying different power processing strategies to each. Only non-legacy fields undergo power enhancement processing, while legacy fields maintain standard processing. This segmentation allows throughput improvement in modern protocols without affecting compatibility and adding minimal complexity.
Solution Approach 2:
The patent applies power enhancement locally to specific non-legacy fields (such as HT-LTF, VHT-LTF) rather than uniformly to the entire preamble. This local quality approach enhances throughput where needed while avoiding unnecessary complexity in processing legacy fields that don't require enhancement.
2Measurement precision
If power enhancement information is added to non-legacy signal field, then channel estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent incorporates power enhancement information in advance within the non-legacy signal field of the preamble. This preliminary action allows the receiving device to pre-know the power enhancement amount before processing the non-legacy fields, enabling accurate channel estimation without requiring complex real-time adjustments or additional processing steps.
3Productivity
If transmit power amplification is increased, then data transmission performance is improved, but peak-to-average power ratio issues worsen
Solution Approach 1:
The patent changes the power parameter selectively for non-legacy fields by introducing a power enhancement amount specifically for these fields. This parameter change allows increasing transmit power for modern protocol fields to improve data transmission performance, while legacy fields maintain their original power characteristics, thus avoiding exacerbation of PAPR issues across the entire signal.
Data Source
AI summary
In an embodiment, a method includes performing, by a transmit end, transmit power enhancement processing on a target field of a preamble in a wireless local area network (WLAN) system, where the target field includes one or more fields, other than a non-legacy signal field, in a non-legacy field of the preamble in the WLAN system. The method also includes sending, by the transmit end, to a receive end the preamble on which transmit power enhancement processing has been performed.