Channel Coding with Non-Uniform Modulation for Nonlinear Channels
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Solution Overview
Problem
Existing channel coding and modulation schemes for higher order MQAM constellations in 3GPP 5G wireless communication are inefficient due to the non-linearity of the transmission medium, leading to diminishing marginal benefits in spectral efficiency.
Innovation Solution
Implementing channel coding and modulation techniques that encode payloads into modulation symbol sequences with unequal probabilities, using pre-channel coding and attaching redundancy check bits to optimize the distribution of constellation points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher order MQAM constellations are used to increase spectral efficiency, then capacity and connectivity improve, but the non-linearity of the transmission medium causes diminishing marginal benefits and performance degradation
Solution Approach 1:
The patent applies local quality by making different constellation points have different probabilities of transmission. Specifically, inner constellation points (with lower power) are assigned higher transmission probabilities while outer constellation points (with higher power) are assigned lower probabilities. This non-uniform probability distribution optimizes the system to exploit the non-linear channel characteristics, improving both spectral efficiency and communication performance simultaneously.
2Ease of manufacture
If uniform probability distribution is used in channel coding, then implementation is simple, but spectral efficiency is suboptimal due to non-linear channel effects
Solution Approach 1:
The patent changes the probability distribution parameter from uniform to non-uniform. Specifically, it introduces a probability distribution parameter that controls the transmission probability of different constellation points. By adjusting this parameter, the system can optimize spectral efficiency while adapting to non-linear channel effects, moving away from the conventional uniform distribution approach.
3Device complexity
If conventional channel coding is used without pre-channel coding, then the process is simpler, but spectral efficiency is reduced due to inability to optimize constellation point distribution
Solution Approach 1:
The patent applies preliminary action by introducing pre-channel coding that operates before the main channel coding process. This pre-channel coding stage prepares the data by optimizing the distribution of constellation points according to non-uniform probabilities, creating a foundation that enables the subsequent channel coding to achieve higher spectral efficiency while accounting for non-linear channel characteristics.
Data Source
AI summary
The present application relates to methods, systems, and devices related to digital wireless communication, and more specifically, to techniques related to channel coding and modulation. In one exemplary aspect, a method for wireless communication is disclosed. The method includes performing multiple operations that include a first operation related to pre-channel coding and/or a second operation comprising attaching redundancy check bits in an order. The method can also include generating a transmission waveform by a first node using one or more bits for transmission to a second node over a wireless channel using information derived from the multiple operations.