PDMA Signal Detection via Modulation Constellation Rotation
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Solution Overview
Problem
In the PDMA technology, the receiving end faces challenges in effectively detecting signals due to overlapping modulation constellation diagrams when multiple layers of data streams using the same modulation constellation and power pass through the same channel, leading to interference and reduced detection accuracy.
Innovation Solution
The method involves adjusting each layer of data modulation symbols on time-frequency resources using a modulation constellation rotating factor, determined by the number of non-zero elements in the encoding matrix, to ensure non-overlapping modulation constellation diagrams, and optionally adjusting power and amplitude to improve signal detection. This is achieved by determining the modulation constellation rotating factor using the formula exp(j*n*π*m*N) and applying it to each layer's data modulation symbols, where n=0, 1...N-1, and N is the number of data layers passing through the same channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple layers of data streams use the same modulation constellation and power in PDMA, then the transmission resource utilization is improved, but the modulation constellation diagrams overlap causing detection difficulty at the receiving end
Solution Approach 1:
The patent applies local quality by assigning different modulation constellations to different data layers. Specifically, the first data layer uses a first modulation constellation while the second data layer uses a second modulation constellation that is different from the first. This allows each layer to have distinct constellation diagrams that do not overlap, enabling the receiving end to distinguish between layers and accurately detect signals, thus resolving the detection difficulty while maintaining efficient resource utilization.
2Device complexity
If multiple layers of data streams use the same modulation constellation, then the encoding complexity is reduced, but the detection accuracy at the receiving end deteriorates due to overlapping constellation diagrams
Solution Approach 1:
The patent implements local quality by assigning different modulation constellations to different data layers. The first data layer is modulated using a first modulation constellation while the second data layer uses a second modulation constellation that is distinct from the first. This differentiation ensures that the modulation constellation diagrams for different layers do not overlap, enabling the receiving end to accurately detect and distinguish between layers, thereby improving detection accuracy without significantly increasing encoding complexity.
3Ease of operation
If the same power is used for all data layers, then the transmission simplicity is maintained, but the signal detection performance deteriorates when layers pass through the same channel
Solution Approach 1:
The patent applies local quality by assigning different modulation constellations to different data layers, which allows the receiving end to distinguish between layers even when they pass through the same channel. This approach maintains transmission simplicity by keeping the power levels uniform across layers while improving signal detection performance through constellation differentiation, thus resolving the contradiction between ease of operation and reliability.
Data Source
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AI summary
The embodiments of the present application relate to the technical field of wireless communications, and in particular to a method and device for detecting data transmission and received signals, which are used for solving the problem in the prior art that it is disadvantageous for signal detection due to the fact that when a receiving end is detected in the scenario that each column of an encoding matrix of PDMA corresponds to one layer of data stream, multiple layers of data modulation symbols are superposed. The embodiments of the present application adjust various layers of data modulation symbols modulated by an initial modulation constellation diagram according to a modulation constellation rotating factor corresponding to various layers of data modulation symbols, so that the modulation constellation diagrams corresponding to various layers of data modulation symbols are not superposed, thereby preventing the problem of being disadvantageous for signal detection of a receiving end due to the fact that multiple layers of data modulation symbols are superposed in the scenario that each column of the encoding matrix of PDMA corresponds to one layer of data stream; and further improving the system performance.