Frequency Domain Pulse Position Modulation for mmWave Reliability
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Solution Overview
Problem
In mmWave wireless communication systems, the signal-to-interference-plus-noise ratio (SINR) conditions are critical, especially in non-line of sight (NLOS) environments, where existing modulation techniques struggle to maintain reliable and spectrum-efficient communication links due to abrupt drops in performance.
Innovation Solution
The implementation of power hierarchical phase position modulation, which uses a high-power peak in the frequency domain to encode data, allowing for adaptable communication by selecting subcarriers at higher power levels to represent data, enabling reliable data transmission in both favorable and unfavorable conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional modulation techniques are used in mmWave wireless communication, then spectrum efficiency is maintained, but reliability deteriorates in NLOS environments due to abrupt SINR drops
Solution Approach 1:
The patent applies dynamics by making the modulation scheme adaptable to changing SINR conditions. The system dynamically switches between different modulation modes (e.g., from high-order QAM to more robust modulation) based on real-time channel conditions, allowing the communication link to maintain reliability across varying environmental conditions including NLOS scenarios.
Solution Approach 2:
The patent utilizes parameter changes by modifying modulation parameters such as constellation size, coding rate, and power distribution based on SINR measurements. This allows the system to optimize performance for both favorable (LOS) and unfavorable (NLOS) conditions, resolving the contradiction between maintaining high reliability and adapting to environmental changes.
2Adaptability or versatility
If high-power peak in frequency domain is used to encode data, then adaptability to changing environments is improved, but device complexity increases due to power hierarchical modulation requirements
Solution Approach 1:
The patent applies segmentation by dividing the frequency domain into multiple subcarriers with different power levels. The signal is segmented into a high-power peak component for encoding data and a lower-power background component for maintaining basic communication. This segmentation enables environmental adaptability while managing complexity through structured power distribution.
Solution Approach 2:
The patent utilizes periodic action by implementing structured power hierarchical patterns in the frequency domain. The power distribution follows a periodic structure with a high-power peak at specific frequency positions, creating a predictable pattern that receivers can easily identify and decode, thereby reducing the actual complexity despite the hierarchical power structure.
3Productivity
If power hierarchical phase position modulation is implemented, then high throughput is achieved in LOS conditions, but loss of energy increases due to high-power peak transmission
Solution Approach 1:
The patent applies local quality by concentrating transmission energy locally at specific frequency positions (the high-power peak) rather than distributing it uniformly across all subcarriers. This localized energy concentration enables high throughput for the most important data while reducing overall energy loss, as energy is not wasted on all subcarriers equally but only where needed for high-rate communication.
Data Source
AI summary
An apparatus of a wireless device has a storage element to store data from a first data stream and a second data stream and a processing component operatively coupled to the storage element. The processing component selects a first set of data from the first data stream to be transmitted and determines one or more subcarriers of a plurality of available subcarriers to transmit at a first power level to represent the first set of data. The processing component also selects a second set of data from the second data stream and encodes the second set of data at a second power level on a set of remaining subcarriers that are not to be transmitted at the first power level. The processing component may then generate a symbol to be transmitted comprising the plurality of subcarriers.