PHY Packet Duplication Across Subbands Under PSD Limits
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Solution Overview
Problem
Wireless communication devices face reduced transmission ranges and packet detection capabilities due to power spectral density (PSD) limits, which restrict the maximum transmit power and affect channel estimation.
Innovation Solution
Implementing packet duplication, resource unit duplication, and tone mapping techniques to increase the frequency bandwidth of wireless transmissions, thereby increasing the PSD limits and allowing higher transmit power without increasing data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power spectral density (PSD) limits are applied to wireless transmissions, then transmission power is restricted to meet regulatory requirements, but transmission range and signal quality deteriorate
Solution Approach 1:
The transmission bandwidth is segmented into multiple frequency subbands, and the same packet is transmitted in each subband. This segmentation allows the system to comply with PSD limits in each individual subband while achieving higher effective transmission power through frequency diversity, thereby extending transmission range without violating regulatory requirements.
Solution Approach 2:
The patent transitions from a single-frequency transmission approach to a multi-frequency subband approach, adding the frequency dimension to the transmission strategy. By duplicating packets across multiple frequency subbands, the system effectively increases the total transmission power while maintaining PSD compliance in each subband, thus resolving the contradiction between PSD limits and transmission range.
2Length of moving object
If transmit power is increased to extend transmission range, then signal quality improves, but power spectral density (PSD) limits are exceeded
Solution Approach 1:
The total transmission power is segmented across multiple frequency subbands, with each subband transmitting at or below the PSD limit. The cumulative effect of transmitting identical packets across multiple subbands achieves the desired transmission range and signal quality without any single subband exceeding PSD requirements.
Solution Approach 2:
The patent merges transmissions across multiple frequency subbands by transmitting the same packet in each subband. This merging of frequency resources allows the system to achieve higher effective transmission power and extended range while maintaining compliance with PSD limits in each individual subband.
3Length of moving object
If packet duplication is implemented across multiple frequency subbands, then transmit power effectiveness increases and transmission range extends, but device complexity increases
Solution Approach 1:
The patent uses packet copying by duplicating the same packet data across multiple frequency subbands. This copying approach is simpler than generating different packets, as it requires minimal processing overhead and can be efficiently implemented using memory operations, thereby limiting the increase in device complexity while achieving extended transmission range.
Data Source
AI summary
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for physical layer (PHY) packet design for power spectral density (PSD) limits. In some implementations, a wireless communication device generates a plurality of PHY convergence protocol (PLCP) protocol data unit (PPDU) duplicates configured for transmission over a selected bandwidth, and transmits each PPDU duplicate of the plurality of PPDU duplicates on a corresponding frequency subband of a plurality of different frequency subbands. In some other implementations, the wireless communication device generates a PPDU for transmission over a set of duplicated resource units (RUs) allocated to the wireless communication device, and transmits the PPDU over the allocated set of duplicated RUs.