Distributed Short Training Field Transmission in PSD-Limited Bands
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Solution Overview
Problem
Existing wireless communication systems inefficiently utilize transmit power due to suboptimal allocation of data and pilot tones in resource units, leading to reduced power in PSD-limited domains and interference issues.
Innovation Solution
Implementing distributed resource unit (dRU) transmission mode with global cyclic shift delay (CSD) and tone plan to transmit short training fields across a spreading bandwidth, ensuring power alignment with long training fields and data, and applying orthogonal sequences to avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If distributed resource unit (dRU) transmission mode is implemented with global cyclic shift delay (CSD) and tone plan, then transmission power for short training fields is enhanced and power alignment with long training fields and data is achieved, but device complexity increases due to additional configuration parameters and processing requirements
Solution Approach 1:
The patent applies parameter changes by introducing a tone plan that maps STF tones to specific subcarriers within the dRU bandwidth, and by configuring global CSD values to align STF power distribution with LTF and data portions. These parameter adjustments enable power alignment across different PPDU components while maintaining PSD limits, resolving the contradiction between enhanced transmission power and device complexity.
2Device complexity
If suboptimal allocation of data and pilot tones in resource units is used, then device complexity is reduced, but transmit power utilization becomes inefficient leading to reduced power in PSD-limited domains
Solution Approach 1:
The patent applies local quality by optimizing the allocation of data and pilot tones within specific resource units to maximize transmit power utilization. The tone plan assigns specific subcarriers for STF transmission within the dRU, and pilot tone locations are carefully selected to improve channel estimation accuracy while maintaining efficient power distribution across the bandwidth, thereby improving local power utilization without requiring global system redesign.
Data Source
AI summary
This disclosure provides methods, devices and systems for distributed transmission of short training fields in a power spectral density limited frequency band. In one aspect, a device receives a distributed resource unit (dRU) assignment for transmission of a dRU portion of a physical layer protocol data unit (PPDU); determines a spatial stream global cyclic shift delay (CSD) index for an short training field (STF) of the dRU portion of the PPDU; and transmits, based on the spatial stream global CSD index, the EHT of the dRU portion of the PPDU across a dRU spreading bandwidth associated with the dRU assignment using a tone plan and sequence corresponding to a regular resource unit (rRU) transmission mode.