Non-Coherent Symbol Mapping for Higher Resource Utilization
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Solution Overview
Problem
Non-coherent transmission methods result in wasted degrees of freedom due to the absence of a matrix A that can perform linear transformation on constellation points, leading to lost information and resource units.
Innovation Solution
The method involves modulating to-be-modulated bits using constellation points corresponding to multiple resource units, associating groups of symbols to determine actual sent symbols, thereby reducing wasted degrees of freedom and improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-coherent transmission is used, then channel state information is not required for demodulation, but degrees of freedom are wasted and resource utilization is reduced
Solution Approach 1:
The patent segments the transmission process into two parts: first transmitting a first symbol set using N1 resource units, then transmitting a second symbol set using N3 resource units. This segmentation allows the system to utilize resource units efficiently by dividing the transmission into manageable portions, reducing wasted degrees of freedom while maintaining non-coherent transmission benefits.
Solution Approach 2:
The patent introduces a dimensional change by associating the first symbol set with a first constellation point and the second symbol set with a second constellation point. This creates a multi-dimensional symbol space where the combination of both symbol sets can represent more information, effectively increasing resource utilization without requiring channel state information.
2Adaptability or versatility
If constellation points are used for non-coherent transmission, then linear transformation can be performed, but M degrees of freedom are lost for each antenna
Solution Approach 1:
The patent merges the first symbol set and second symbol set into a combined symbol set that is transmitted together. By combining these two symbol sets, the system recovers some of the lost degrees of freedom, as the combined set can represent more information than either set alone, while still maintaining the non-coherent transmission advantage.
Solution Approach 2:
The patent changes the parameter of resource unit utilization by using N1 resource units for the first symbol set and N3 resource units for the second symbol set, where N3 is less than or equal to N2. This parameter change allows the system to reduce wasted degrees of freedom by optimizing the allocation of resource units across different constellation points.
3Productivity
If resource units are used for transmitting symbol sets, then data can be sent, but some resource units are wasted
Solution Approach 1:
The patent performs preliminary action by first determining the first symbol set based on a first to-be-modulated bit and then determining the second symbol set based on a second to-be-modulated bit. This preliminary determination allows the system to optimize the use of resource units before actual transmission, reducing wasted resources by carefully selecting which resource units to use for each symbol set.
Data Source
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AI summary
This application provides a communication method and a communication apparatus for non-coherent transmission. In this method, a transmit end device separately modulates a first to-be-modulated bit and a second to-be-modulated bit by using constellation points corresponding to a plurality of resource units, to obtain P1 first symbols carrying the first to-be-modulated bit and P2 second symbols carrying the second to-be-modulated bit; determines, by associating the P1 first symbols with the P2 second symbols, P3 second symbols that are actually sent and related to the second to-be-modulated bit; and sends the P1 first symbols and the P3 third symbols, so that wasted degrees of freedom in non-coherent transmission can be reduced, to improve resource utilization.