Wireless Reception Constellation Estimation for Amplifier Nonlinearity
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Solution Overview
Problem
Existing wireless communication technologies face challenges in maintaining high data rates while utilizing the non-linear region of amplifiers, leading to potential data distortion and reduced efficiency due to the need for frequent pilot signal transmission.
Innovation Solution
A wireless communication system and method that includes a transmission apparatus with a variable transmission signal amplifier, sharing amplifier specifications and transmission power information with a reception apparatus, enabling signal point estimation and likelihood calculation to correct for distortion in the non-linear region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to improve signal-to-noise ratio, then communication quality is improved, but signal distortion increases due to amplifier non-linearity
Solution Approach 1:
The invention performs preliminary estimation of signal points and calculation of likelihood values before actual signal reception. By pre-calculating expected signal positions and their probability distributions, the system can compensate for non-linear distortion effects that occur during high-power transmission, thereby maintaining both high signal-to-noise ratio and low distortion
Solution Approach 2:
The invention introduces feedback mechanisms where the reception apparatus estimates signal points, calculates likelihood values, and uses this information to correct for distortion. The system continuously adjusts its estimation based on the calculated likelihood, creating a closed-loop feedback system that compensates for amplifier non-linearity while maintaining high transmission power
2Measurement precision
If pilot signals are frequently transmitted to correct phase shift, then distortion correction is improved, but data transmission efficiency decreases
Solution Approach 1:
The invention extracts only the essential distortion correction information from pilot signals and separates it from the main data transmission. By using preliminary signal point estimation and likelihood calculation, the system can obtain sufficient correction information with fewer pilot signals, thereby reducing the overhead and improving data transmission efficiency while maintaining adequate phase shift detection accuracy
3Object-affected harmful factors
If transmission power is limited to linear region to avoid distortion, then signal quality is maintained, but amplifier capability is underutilized
Solution Approach 1:
The invention converts the harmful non-linear distortion effect into a beneficial characteristic by using preliminary signal point estimation and likelihood calculation to model and compensate for the distortion. This allows the system to intentionally operate in the non-linear region to utilize amplifier capability while the distortion becomes a predictable factor that can be corrected through the estimation and likelihood-based approach
Data Source
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AI summary
Provided is a wireless communication system using a single-carrier multi-value modulation scheme, the wireless communication system aiming at preventing erroneous transmission of data and securing a high data rate while utilizing a non-linear region of an amplifier. A reception apparatus acquires, from a transmission apparatus, a specification 62 related to an input/output characteristic of a transmission signal amplifier and transmission power 64 of data transmission. On the basis of the specification and the transmission power, a constellation 66 of signal points is estimated. A reception point 58, which is a point in constellation coordinates, of a reception signal is detected, and likelihood calculation 68 for the reception point is performed with respect to the signal points. A symbol intended by the reception point is identified on the basis of a result of the likelihood calculation 68.