Dynamic Window Function for 5G Symbol Transmission
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Solution Overview
Problem
Existing 5G NR waveform and numerology selection is overly constrained by a limited fixed number of cyclic prefix lengths, leading to reduced performance and increased energy consumption due to inter-symbol interference (ISI) and inadequate channel adaptation.
Innovation Solution
Applying a window function to symbols based on channel length to generate modified symbols, which reduces ISI and energy consumption by dynamically adapting to channel conditions, allowing for variable cyclic prefix lengths and improved numerology selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed number of cyclic prefix lengths are used to ensure inter-symbol interference is reduced or avoided, then reliability is improved, but adaptability deteriorates
Solution Approach 1:
The patent applies window functions with properties (such as length and shape) that are dynamically selected based on the detected channel length. This allows the cyclic prefix to adapt to different channel conditions rather than using a fixed set of predetermined lengths, resolving the contradiction between maintaining reliable ISI reduction and achieving adaptability to various channel scenarios.
Solution Approach 2:
The invention changes the parameters of the cyclic prefix by applying window functions with different properties (length, shape, tapering characteristics) depending on the channel length. This parameter adaptation allows the system to maintain optimal performance across diverse channel conditions while preserving the ISI reduction benefits through proper windowing.
2Reliability
If longer cyclic prefix lengths are used to cover worst-case channel conditions, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent dynamically adjusts the cyclic prefix parameters (length and window function properties) based on the detected channel length. Instead of always using the longest CP to cover worst-case scenarios, the system selects appropriate CP parameters matched to the actual channel conditions, thereby maintaining reliable coverage when needed while reducing energy consumption in shorter channel scenarios.
Solution Approach 2:
The system transitions from static, worst-case-oriented CP design to a dynamic approach where CP parameters are adapted in real-time based on channel measurements. This allows the system to use longer CPs only when necessary for reliability while using shorter, more energy-efficient CPs when channel conditions permit.
3Device complexity
If a limited fixed number of cyclic prefix lengths are used, then device complexity is reduced, but adaptability deteriorates
Solution Approach 1:
The patent enables continuous adaptation of cyclic prefix parameters through window function application, moving beyond a limited discrete set of fixed lengths. By varying window function properties based on channel length, the system achieves fine-grained adaptability to different service scenarios without requiring multiple discrete numerology configurations, thus maintaining simplicity while enhancing versatility.
Data Source
AI summary
In one example aspect, a method is provided of preparing a symbol for transmission, the method comprising applying a window function to a symbol to generate a modified symbol, wherein a property of the window function is based on a channel length of a transmission channel over which the modified symbol is to be transmitted, and causing the modified symbol to be transmitted over the transmission channel.