Wireless Communication Power Control for Nonlinear Amplifier Compensation
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Solution Overview
Problem
Existing wireless communication systems using single-carrier multi-value modulation face issues with distortion and data errors due to amplifier non-linearity and interference from other cells, leading to reduced data rates and inefficient use of amplifier capabilities.
Innovation Solution
A wireless communication system utilizing a centralized control device that manages transmission power across multiple base stations and terminal stations, enabling signal point estimation, interference detection, and likelihood calculation to optimize transmission power and correct for distortion and interference, allowing operation in the non-linear amplifier region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to improve signal-to-noise ratio, then data transmission reliability is improved, but distortion occurs due to amplifier non-linearity
Solution Approach 1:
The system pre-acquires amplifier input-output characteristic information and uses it to predict and correct distortion before transmission. The reception device calculates expected distortion based on stored characteristic data and transmission power, then compensates for it in advance during signal processing.
Solution Approach 2:
The system implements feedback by using detected distortion characteristics to adjust signal processing. The reception device continuously monitors distortion based on amplifier characteristics and transmission power, then applies corrective processing to maintain signal quality.
2Reliability
If transmission power is kept within linear region to avoid distortion, then signal quality is maintained, but amplifier capability is not fully utilized and data rate is reduced
Solution Approach 1:
The system converts the harmful non-linear distortion into a manageable characteristic by pre-measuring and storing amplifier input-output characteristics. Instead of avoiding the non-linear region, the system uses its predictable distortion pattern to its advantage through compensation processing, enabling full amplifier utilization while maintaining signal quality.
3Measurement precision
If pilot signals are used to correct phase shift in non-linear region, then phase accuracy is improved, but system complexity and overhead increase
Solution Approach 1:
Instead of using actual pilot signals to measure phase shift, the system creates a virtual copy of the distortion characteristic by storing amplifier input-output data. This copied characteristic information is then used for compensation, eliminating the need for complex pilot signal insertion and measurement mechanisms.
4Area of stationary object
If interference from other cells is present in dense environments, then communication coverage is extended, but error rate increases due to interference
Solution Approach 1:
The system changes the processing parameters by incorporating interference power detection into the distortion compensation algorithm. By adjusting the compensation calculation to account for interference conditions, the system maintains accuracy even in dense multi-cell environments where interference is present.
Data Source
AI summary
A system including a plurality of base stations and terminal stations. A base station includes a transmission signal amplifier enabled to vary transmission power, provides a specification regarding an input-output characteristic of the transmission signal amplifier to a terminal station, and provides transmission power to the terminal station. The terminal station estimates a constellation of a signal points on the basis of the transmission power and the specification, detects a coordinate point on constellation coordinates, of a reception signal, and detects interference power received from base stations and that are not communication partners. Further, a reception point is calculated in which an influence of the interference power is reflected on the coordinate point, and a likelihood with the signal points is calculated for the reception point. Then, a symbol intended by the reception signal is specified on the basis of a calculation result of the likelihood.