Distributive Resource Units for PSD-Compliant OFDMA Power Balance
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Solution Overview
Problem
Wireless communication systems face challenges in meeting government-regulated power spectral density (PSD) requirements due to limitations on transmitter power, particularly in systems like IEEE 802.11ax, where resource units (RUs) are constrained by PSD regulations, leading to potential transmit power imbalances and reduced communication performance.
Innovation Solution
The implementation of distributive resource units (DRUs) using relative prime interleaving to distribute subcarriers uniformly across RUs, ensuring compliance with PSD regulations while improving communication performance by avoiding tone transmit power imbalances and allowing flexible implementation without the need for index mapping tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resource units (RUs) are used with different TX power, then communication performance can be optimized, but government-regulated PSD requirements are violated
Solution Approach 1:
The patent segments the frequency spectrum into multiple subcarriers and divides them into different resource units (RUs), where each RU can be allocated to different users with independent power control. This segmentation allows the system to meet PSD requirements at the individual subcarrier level while maintaining overall communication performance through coordinated power allocation across RUs.
Solution Approach 2:
The patent applies local quality by allowing different TX power levels for different RUs based on their specific frequency locations and regulatory requirements. Each RU can be configured with appropriate power levels that satisfy local PSD constraints while optimizing performance for that particular frequency band, rather than using a uniform power approach.
2Object-affected harmful factors
If TX power is limited to meet PSD requirements, then regulatory compliance is achieved, but transmit power imbalance occurs
Solution Approach 1:
The patent changes the power allocation parameter by introducing flexible power control mechanisms that adjust TX power on a per-RU basis. This allows the system to compensate for power imbalances by dynamically allocating higher power to RUs that need it more, while still adhering to PSD limits through coordinated control across all frequency resources.
3Object-affected harmful factors
If subcarriers are distributed uniformly across RUs, then PSD requirements are met, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the subcarrier-to-RU mapping relationships and power allocation strategies before actual communication begins. This includes pre-calculating optimal power levels for different RU configurations and establishing the distributive resource unit structure in advance, which simplifies real-time operation while maintaining uniform subcarrier distribution for PSD compliance.
Data Source
AI summary
A communication method has the step of: transmitting or receiving a signal using a first resource unit (RU) in an orthogonal frequency-division multiple access (OFDMA) physical layer protocol data unit (PPDU) having a plurality of subcarriers, some of which are available subcarriers for transmitting data and/or pilot symbols, and others are unavailable subcarriers. The first RU is one of a plurality of RUs of the OFDMA PPDU. Each RU has a subset of the available subcarriers. The subcarrier indices of any one of the RUs are different from the subcarrier indices of any other one of the RUs, and the subcarriers of each of the RUs are substantially distributed over an entirety of a frequency spectrum formed by all the available subcarriers. The unavailable subcarriers include predefined unavailable subcarriers and subcarriers that are in an unallocated or punctured frequency spectrum.