Symbol Constellation Shaping for Wireless Reliability
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Solution Overview
Problem
Conventional Media-Based Modulation (MBM) using RF mirrors for beyond 5G wireless communication systems faces inefficiencies due to small minimum pairwise distance of symbol constellations, leading to poorer performance compared to traditional SISO source-based modulation.
Innovation Solution
A communication device with a set of antenna elements configured to operate in various radiating patterns, controlled by a processor to obtain and customize symbol constellations based on channel estimations and weights, enabling enhanced symbol shaping and transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional MBM using RF mirrors is used for wireless communication, then the system enables signal manipulation through the environment, but the minimum pairwise distance of symbol constellations becomes small leading to poorer performance
Solution Approach 1:
The patent applies parameter changes by optimizing the symbol constellation parameters (weights, phases, amplitudes) to maximize the minimum pairwise distance. The processor adjusts these parameters based on channel state information to ensure adequate separation between constellation points, thereby improving transmission reliability while maintaining the MBM functionality.
Solution Approach 2:
The system implements feedback by using channel state information to adaptively adjust the symbol constellation parameters. The receiver provides feedback about the channel conditions, and the transmitter uses this information to optimize the constellation configuration, ensuring that the minimum pairwise distance is maximized for the current channel state.
2Productivity
If symbol constellations are customized to the radio environment using weights, then spectral efficiency is enhanced, but device complexity increases
Solution Approach 1:
The system applies preliminary action by pre-computing and storing multiple optimized symbol constellation configurations corresponding to different channel conditions. When a specific channel state is detected, the processor quickly selects the pre-computed constellation that matches the current conditions, avoiding real-time complex optimization calculations and reducing processing complexity.
Solution Approach 2:
The patent implements dynamics by enabling the symbol constellation to adapt dynamically to changing radio environment conditions. The processor adjusts the constellation parameters in real-time based on channel state variations, allowing the system to maintain optimal spectral efficiency while the environment changes, balancing performance with manageable complexity through adaptive rather than static configuration.
Data Source
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AI summary
The invention relates to first and second communication devices for shaping symbol constellation in wireless transmissions. The first communication device (100) obtain a second symbol constellation based on the first symbol constellation and the set of weights, where the first symbol constellation is based on a radiating pattern (600i) in a set of radiating patterns (600a, 600b,..., 600n) for the first communication device (100) and the weights are derived based on the first symbol constellation. Thereafter, the set of antenna elements (106a, 106b,...,106n) are controlled according to the radiating pattern (600i) for transmitting a set of information bits mapped onto the second symbol constellation. Thereby, the second symbol constellation is customized to the radio environment to enable smart radio that enjoys improved signal design and thereby better performance. Furthermore, the invention also relates to corresponding methods and a computer program.