Wireless Communication Power Multiplexing Beyond Frequency Channels
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Solution Overview
Problem
Existing wireless communication technologies, such as Non Orthogonal Multiple Access (NOMA), are limited in multiplexing frequency channels within the same wireless section, preventing the transmission of a larger number of signals than the number of frequency channels.
Innovation Solution
A wireless communication system that converts n+1 signals into n predetermined power signals and n divided signals, non-orthogonally superimposes them across n frequency channels, and uses a reception device to demodulate, subtract, and combine signals to restore the original signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-orthogonal multiple access (NOMA) is used to multiplex signals, then frequency utilization efficiency is improved, but the number of multiplexed signals is limited to the number of frequency channels
Solution Approach 1:
The patent transitions from orthogonal multiplexing in the frequency domain to non-orthogonal multiplexing in the power domain. By superimposing multiple user signals with different power levels on the same frequency channel, the system enables more signals to be transmitted simultaneously without increasing the number of frequency channels, thus resolving the contradiction between frequency utilization efficiency and the number of multiplexed signals.
Solution Approach 2:
The patent changes the power allocation parameters of transmitted signals to enable non-orthogonal multiplexing. By adjusting the power levels of different user signals and using power difference for signal separation at the receiver, the system achieves frequency reuse and increases the number of multiplexed signals beyond the number of frequency channels available.
2Quantity of substance
If signals are non-orthogonally multiplexed in the power axis direction, then more signals can be transmitted on the same wireless resource, but signal separation and detection become more difficult
Solution Approach 1:
The patent applies preliminary action by performing signal separation and interference cancellation at the receiver before final signal detection. The receiver first separates the superimposed signals based on power differences, cancels out interference from stronger signals, and then detects weaker signals. This preliminary separation action reduces the difficulty of detecting and measuring multiple non-orthogonally multiplexed signals.
Solution Approach 2:
The patent uses power difference as an intermediary parameter to facilitate signal separation. By introducing distinct power levels between multiplexed signals, the receiver can use power-based filtering and interference cancellation techniques to separate signals that would otherwise be difficult to distinguish, thus reducing detection difficulty while maintaining high signal multiplexing capacity.
Data Source
AI summary
A wireless communication method according to an embodiment includes converting n+1 signals into n predetermined power signals obtained by setting a C/N to a predetermined value and into n divided signals obtained by setting the C/N to 1/n of a predetermined value and performing division into n, superimposing the n predetermined power signals and the n divided signals that have been converted, non-orthogonally so as to be n multiplexed signals for the n frequency channels, transmitting the n multiplexed signals, receiving n multiplexed signals, demodulating n predetermined power signals from the n multiplexed signals that have been received, creating replica signals of each of the n predetermined power signals, subtracting each of the n replica signals that have been created from each of the n multiplexed signals, and combining the n subtracted signals.