Distributed Tone Plan for Lower PAPR and PSD Compliance
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Solution Overview
Problem
Existing wireless communication systems face limitations in transmission power and efficiency due to regulatory power spectral density constraints and peak-to-average power ratio (PAPR) issues in allocating tones for data transmission.
Innovation Solution
A distributed tone plan that allocates tones across a wider bandwidth with regular spacing, maximizing transmission power while adhering to regulatory limits and reducing PAPR, using orthogonal frequency-division multiplexing (OFDM) and orthogonal frequency-division multiple access (OFDMA) schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tones are allocated contiguously for data transmission, then transmission efficiency is improved, but peak-to-average power ratio (PAPR) increases and regulatory power spectral density limits are violated
Solution Approach 1:
The patent segments the contiguous tone allocation into multiple distributed tone groups spaced across the frequency spectrum. Each group contains tones that are non-contiguously distributed, which reduces the peak-to-average power ratio while maintaining overall transmission efficiency. This segmentation approach allows the system to comply with regulatory power spectral density limits without sacrificing productivity.
Solution Approach 2:
The patent changes the distribution parameter of tones from contiguous to distributed spacing. By modifying the frequency spacing parameter between tones, the system achieves lower PAPR and compliance with power spectral density regulations while maintaining adequate transmission efficiency through optimized tone selection and distribution patterns.
2Power
If transmission power is increased to boost performance, then power amplifier efficiency improves, but regulatory power spectral density constraints are violated
Solution Approach 1:
The patent segments the power spectrum utilization by distributing tones across multiple frequency locations rather than concentrating them. This segmentation allows the system to operate at higher total transmission power while keeping the power spectral density at any single frequency below regulatory limits, thus boosting power amplifier efficiency without violating constraints.
Solution Approach 2:
The patent transitions from one-dimensional contiguous tone allocation to a multi-dimensional distributed tone allocation pattern. By spreading tones across multiple frequency dimensions with regular spacing, the system achieves higher overall power transmission while maintaining compliance with power spectral density limits through optimized spectral distribution.
Data Source
AI summary
An electronic device is provided that includes a wireless network interface and at least one processor coupled to the wireless network interface. The at least one processor is configured to select a resource unit from a tone plan, notify another electronic device of the selected resource unit via the wireless network interface, and communicate data with the other electronic device using the selected resource unit via the wireless network interface. The tone plan is characterized by a first tone sub-plan comprising a first plurality of resource units having a first size, wherein each resource unit of the first plurality of resource units includes a respective plurality of tones from a contiguous range of tones, and wherein the tones of each respective plurality of tones have a spacing in the contiguous range of tones of an integer multiple of a first factor greater than one.