Cyclic Prefix Adaptation for Wireless Security and Energy Harvesting
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Solution Overview
Problem
Existing wireless communications systems face challenges in adapting cyclic prefix (CP) lengths to balance spectral and power efficiency with security and energy charging requirements, particularly in dynamic and complex environments.
Innovation Solution
The method involves determining a CP length for wireless communications based on energy charging and security requirements, which can include adjusting CP length based on delay spread, transmit precoder models, and periodic cycles, to optimize CP usage for both efficiency and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed cyclic prefix length is used in wireless communications, then system simplicity is maintained, but spectral efficiency and power efficiency cannot be optimized for different channel conditions and security requirements
Solution Approach 1:
The patent implements dynamic CP length adjustment by allowing the transmitter to select different CP lengths (first CP length or second CP length) based on channel conditions, security requirements, and energy charging needs. This transforms the static CP structure into a dynamic one that adapts to varying operational requirements, resolving the contradiction between adaptability and system complexity.
Solution Approach 2:
The patent changes the CP length parameter dynamically based on multiple factors including delay spread measurements, security requirements, and energy charging requirements. By modifying this key parameter adaptively, the system achieves optimal spectral efficiency and power efficiency without requiring complete system redesign, thus balancing adaptability with manageable complexity.
2Reliability
If a longer cyclic prefix is used to increase security through artificial noise insertion, then security is improved, but spectral efficiency deteriorates due to increased overhead
Solution Approach 1:
The patent dynamically adjusts CP length based on security requirements. When high security is needed, the system selects a longer CP length to insert more artificial noise. When security requirements are lower, it switches to a shorter CP length to maintain spectral efficiency. This dynamic approach resolves the contradiction by allowing the system to optimize security without permanently sacrificing productivity.
Solution Approach 2:
The patent modifies the CP length parameter adaptively based on security requirements and channel conditions. By changing this parameter dynamically rather than using a fixed long CP, the system achieves enhanced security only when necessary, thereby maintaining acceptable spectral efficiency in normal operating conditions.
3Use of energy by moving object
If a longer cyclic prefix is used to enable energy harvesting, then energy charging capability is improved, but power efficiency worsens due to extended transmission time
Solution Approach 1:
The patent implements dynamic CP length selection based on energy charging requirements. When energy harvesting is prioritized, the system uses a longer CP length to provide more energy for charging. When power efficiency is more critical, it switches to a shorter CP length. This dynamic adjustment resolves the contradiction between energy charging capability and power efficiency.
Solution Approach 2:
The patent changes the CP length parameter based on energy charging requirements and power efficiency considerations. By adaptively modifying this parameter, the system can optimize energy harvesting when needed while maintaining power efficiency during normal operation, thus resolving the contradiction between these two energy-related metrics.
4Productivity
If cyclic prefix length is adapted based on multiple factors including delay spread, security requirements, and energy charging requirements, then overall system performance is improved, but determination complexity increases
Solution Approach 1:
The patent segments the CP length determination process into distinct evaluation stages: delay spread measurement, security requirement assessment, and energy charging requirement evaluation. Each factor is considered separately and systematically, which simplifies the overall complex determination process while still achieving optimal system performance based on multiple criteria.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for cyclic prefix (CP) optimization and adaptation. Certain aspects provide a method for wireless communication by a first communications device. The method generally includes determining a first CP length for communicating with a second communications device based on at least one of: an energy charging requirement of the first communications device or the second communications device or a security requirement for communications between the first communications device and the second communications device, and communicating, with the second communications device, a first signal over a first symbol, wherein the first signal comprises a first CP having the first CP length.