Complex Constellation Point Sequence Mapping for Resource Element Utilization
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Solution Overview
Problem
Conventional index modulation (IM) technologies do not fully utilize available resource elements, leading to suboptimal communication performance and increased error rates due to unnecessary reduction in the distance between constellation points.
Innovation Solution
A communication system that converts bit sequences into complex constellation point sequences with a non-power of two number of complex constellation points, allowing for more efficient resource element mapping and improved error rate characteristics by increasing the distance between constellation points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional index modulation maps complex constellation points to specific positions only, then resource element utilization is reduced, but implementation simplicity is maintained
Solution Approach 1:
The patent changes the fundamental parameter of constellation point mapping by allowing multiple complex constellation points (not just one) to be mapped to each resource element position. This transforms the conventional IM approach where a single constellation point is assigned to specific positions, thereby fully utilizing available resource elements while maintaining the position-based information carrying mechanism.
Solution Approach 2:
The patent introduces an additional dimension to the mapping process by enabling multiple constellation points per resource element. This dimensional expansion allows the system to carry more information per resource element through the combination of position information and multiple constellation point values, improving both utilization and reliability.
2Productivity
If complex constellation points are mapped to all available resource elements, then resource utilization improves, but the distance between constellation points decreases leading to higher error rates
Solution Approach 1:
The patent segments the information carrying function into two independent parts: position information and constellation point value information. By mapping multiple constellation points to specific resource element positions, the system separates the spatial dimension (position) from the amplitude/phase dimension (constellation value), allowing both to contribute independently to information transmission without compromising the distance between constellation points.
Solution Approach 2:
The patent merges two types of information encoding—position-based index modulation and traditional constellation mapping—into a unified scheme. Each resource element carries both position information (which resource elements are active) and value information (what constellation points are mapped there), creating a combined modulation approach that achieves full resource utilization while maintaining robust error performance.
3Reliability
If multiple complex constellation points are mapped to resource elements, then communication performance improves, but system complexity increases
Solution Approach 1:
The patent employs self-service mechanisms where the transmitter and receiver use identical mapping and demapping algorithms. The conversion unit at the transmitter maps bit sequences to complex constellation point sequences using the same rules that the receiver uses to interpret them, reducing the need for complex coordination or additional processing infrastructure.
Data Source
AI summary
A communication device includes an acquisition unit that acquires a bit sequence, and a conversion unit that converts the bit sequence to a predetermined complex constellation point sequence including a plurality of complex constellation points including a non-zero complex constellation point and a zero complex constellation point. At least one of the predetermined complex constellation point sequences is a first complex constellation point sequence in which each of a plurality of complex constellation points constituting the complex constellation point sequence is converted to any complex constellation point or zero complex constellation point of a first signal constellation including non-power of two number of complex constellation points. The conversion unit converts one of the bit sequences to at least the first complex constellation point sequence.