Modulated STF Structure for 60 GHz WLAN PAPR Reduction
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Solution Overview
Problem
Current 60 GHz WLAN standards face limitations in data transmission flexibility due to high peak to average power ratio (PAPR) in OFDM signals, leading to inefficient power amplifier use and low data transmission flexibility.
Innovation Solution
A data transmission method that generates a PPDU with a modulated Short Training Field (STF) containing zero and non-zero elements, where zero elements are strategically inserted to reduce PAPR, allowing for improved power amplifier efficiency and increased data transmission flexibility by mapping the STF to consecutive subcarriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OFDM transmission mode is used to achieve frequency division multiplexing, then data transmission capability is improved, but peak to average power ratio increases causing power amplifier inefficiency
Solution Approach 1:
The patent segments the STF into multiple parts (first STF and second STF) with different structures. The first STF uses traditional OFDM format while the second STF uses a new format with reduced PAPR, allowing the system to benefit from frequency division multiplexing while improving power amplifier efficiency in certain portions of the training sequence.
Solution Approach 2:
The patent changes the structural parameters of the STF by introducing a new format where the second STF contains only real-valued subcarriers instead of complex-valued subcarriers. This parameter change reduces the PAPR of the transmitted signal, thereby improving power amplifier efficiency while maintaining data transmission capability through frequency division multiplexing in the first STF.
2Use of energy by moving object
If single-carrier transmission mode is used to reduce peak to average power ratio, then power amplifier efficiency is improved, but frequency division multiplexing capability is lost
Solution Approach 1:
The patent merges the advantages of both single-carrier and OFDM transmission modes into a hybrid STF structure. The first STF maintains OFDM characteristics for frequency division multiplexing, while the second STF adopts single-carrier characteristics with reduced PAPR, thereby combining the benefits of both transmission modes in one unified structure.
Solution Approach 2:
The patent introduces dynamic flexibility by allowing the second STF to be configured with real-valued subcarriers that can be adaptively set. This dynamic configuration enables the system to adjust between OFDM and single-carrier characteristics based on channel conditions and transmission requirements, optimizing both data transmission capability and power amplifier efficiency.
3Adaptability or versatility
If traditional STF structure is used, then compatibility with existing standards is maintained, but data transmission flexibility is limited
Solution Approach 1:
The patent segments the STF into two distinct parts with different structures, allowing each segment to serve specific functions. This segmentation enables enhanced data transmission flexibility through the second STF while maintaining standard compatibility through the first STF, and facilitates independent optimization of each segment without increasing overall system complexity.
Data Source
AI summary
In this application, a manner of generating a modulated field STF is enriched, so that a manner of generating a PPDU is enriched, thereby improving data transmission flexibility. The method includes: After generating a PPDU, a transmit end sends the PPDU to at least one receive end, where the PPDU includes at least one modulated field STF, the modulated field STF includes a plurality of zero elements and a plurality of non-zero elements, m1 zero elements are included before a first non-zero element, m2 zero elements are included after a last non-zero element, m1+m2 zero elements are included between any two adjacent non-zero elements, m1 and m2 both are positive integers, and the modulated field STF is mapped to a plurality of consecutive subcarriers for transmission. This application is used for data transmission.