320 MHz EHT PPDU STF Sequence for Wideband PAPR Optimization
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Solution Overview
Problem
Existing wireless local area network (WLAN) systems face challenges in efficiently utilizing increased spatial streams and bandwidths, such as 160 MHz, 240 MHz, and 320 MHz, due to the need for improved signaling techniques to support the next-generation EHT standard (IEEE 802.11be) while maintaining compatibility with previous standards like 802.11ax.
Innovation Solution
A method and apparatus for transmitting an Extremely High Throughput (EHT) physical protocol data unit (PPDU) with an optimized short training field (STF) sequence, tailored for 320 MHz and 160+160 MHz bands, to achieve an optimal peak-to-average power ratio (PAPR) by repeating an 80 MHz tone plan, thereby enhancing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bandwidth is increased to 160 MHz, 240 MHz, or 320 MHz to increase throughput, then the data transmission capacity is improved, but the peak-to-average power ratio (PAPR) of the signal deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the STF sequence design for wider bandwidths. Specifically, it defines new STF sequences for 160 MHz, 240 MHz, and 320 MHz bands that differ from simple repetitions of 80 MHz sequences, thereby changing the signal parameters to achieve optimal PAPR while maintaining the increased bandwidth benefits
Solution Approach 2:
The patent segments the wide bandwidth into multiple 80 MHz sub-bands and applies different STF sequence configurations to each segment. For example, in 160 MHz band, it uses specific sequences for lower and upper 80 MHz sub-bands, and in 320 MHz band, it segments into four 80 MHz sub-bands with tailored sequences, allowing independent optimization of each segment's PAPR characteristics
2Device complexity
If the tone plan for 80 MHz band is repeated to support wider bandwidths, then the system complexity is reduced through reuse, but the PAPR optimization deteriorates due to repetitive structure
Solution Approach 1:
The patent applies local quality by making each 80 MHz segment within the wider bandwidth have customized STF sequence characteristics rather than uniform repetition. Each segment is assigned specific sequence parameters (a0, a1, a2, a3) that are locally optimized for that segment's position and characteristics, thereby improving overall PAPR while maintaining manageable complexity through modular design
3Object-generated harmful factors
If the STF sequence is optimized for specific bandwidths (160 MHz, 240 MHz, 320 MHz), then the PAPR is improved, but the compatibility with existing standards deteriorates
Solution Approach 1:
The patent applies dynamics by making the STF sequence selection and configuration adaptive to the actual bandwidth being used. The system dynamically chooses appropriate STF sequences based on whether 80 MHz, 160 MHz, 240 MHz, or 320 MHz bandwidth is configured, and can further adapt within wider bands based on puncturing patterns and RF capabilities, thereby achieving PAPR optimization without sacrificing compatibility through rigid fixed designs
Data Source
AI summary
A method and device for transmitting an EHT PPDU in a wireless LAN system is proposed. Specifically, a transmission STA generates an STF signal for a 320 MHz band. The transmission STA transmits an EHT PPDU including the STF signal to a reception STA. The STF signal is generated on the basis of an EHT STF sequence. The EHT STF sequence is a first sequence in which preconfigured sequence M is repeated, and is defined as {M 1 −M 0 −M 1 −M 0 −M −1 M 0 −M 1 −M 0 −M −1 M 0 M −1 M 0 −M −1 M 0 −M 1 −M}*(1+j)/sqrt(2). Sqrt( ) represents a square root. Preconfigured sequence M is defined as M={−1, −1, −1, 1, 1, 1, −1, 1, 1, 1, −1, 1, 1, −1, 1}.