Subcarrier Bit and Power Allocation with Phase Noise Compensation
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Solution Overview
Problem
In multicarrier communications systems, the influence of phase noises is not considered in bit number and power allocation for subcarriers, leading to degraded transmission performance.
Innovation Solution
A method and apparatus that allocate bit numbers and power for subcarriers based on signal-to-noise ratios and phase noises, using a bit number calculating unit, a bit number allocating unit, and a power allocating unit to improve transmission performance by adjusting bit numbers and power according to phase noise-induced constellation rotations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bit numbers and power are allocated for subcarriers without considering phase noises, then the allocation process is simple, but transmission performance is degraded
Solution Approach 1:
The patent changes the allocation parameters from simple SNR-based bit numbers to phase noise-compensated bit numbers. The bit number calculating unit computes initial bit numbers based on SNR, then the bit number allocating unit adjusts these bit numbers by considering phase noise characteristics, thereby improving transmission performance while maintaining a systematic allocation process
Solution Approach 2:
The patent introduces feedback mechanisms where the bit number allocating unit uses phase noise information to adjust the bit numbers calculated by the bit number calculating unit. This feedback loop ensures that the allocation adapts to actual channel conditions, improving reliability without requiring complete redesign of the allocation system
2Reliability
If phase noise compensation is implemented in bit number allocation, then transmission performance is improved, but calculation complexity increases
Solution Approach 1:
The patent segments the complex phase noise compensation task into distinct functional units: a bit number calculating unit that handles initial bit number computation based on SNR, and a bit number allocating unit that separately handles phase noise compensation. This segmentation makes the overall system more manageable and easier to implement
3Productivity
If power allocation is optimized based on phase noise, then system efficiency is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality optimization where power is allocated differently to different subcarriers based on their specific phase noise characteristics and bit number allocations. The power allocating unit ensures that subcarriers with higher bit numbers (which are more sensitive to phase noise) receive appropriate power levels, optimizing overall system efficiency while avoiding uniform power increases across all subcarriers
Data Source
AI summary
An apparatus and method for bit number allocation and power allocation of subcarriers and electronic equipment. The apparatus includes: a bit number calculating unit configured to calculate bit numbers to which subcarriers in a multicarrier communications system correspond according to signal to noise ratios of the subcarriers; a bit number allocating unit configured to allocate bit numbers for the subcarriers based on the bit numbers to which the subcarriers correspond calculated by the bit number calculating unit and a phase noise of the multicarrier communications system in communicating; wherein, the allocated bit numbers are related to signal modulation formats of the subcarriers; and a power allocating unit configured to allocate corresponding power for the subcarriers according to the bit numbers allocated by the bit number allocating unit for the subcarriers. With the embodiments, a transmission performance of the multicarrier communications system may be improved.