Adaptive Constellation Mapping for MIMO Interference Reduction
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Solution Overview
Problem
Current multiple-input multiple-output (MIMO) techniques in wireless communications face limitations in achieving higher communication rates with minimal power consumption and cost, particularly in managing channel conditions and interference in multi-cell and multi-user scenarios.
Innovation Solution
The method involves determining optimal constellation mappings and transmission formats by estimating channel transfer functions and selecting the best mapping combinations to minimize interference and maximize data rates across multiple transmitter chains and antennas, allowing for efficient data transmission even when the number of layers exceeds the number of receive antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional MIMO techniques are used, then communication rates are maintained at current levels, but further improvements in communication rates cannot be achieved
Solution Approach 1:
The patent implements dynamic adaptation of constellation mappings based on real-time channel conditions. The system continuously estimates channel transfer functions and selects optimal mapping combinations from multiple candidate mappings, allowing the communication system to dynamically adjust to varying channel conditions and achieve higher data rates
Solution Approach 2:
The patent changes the mapping parameters between transmit antennas and receive antennas based on channel conditions. By selecting from multiple candidate constellation mappings with different mapping relationships, the system optimizes communication performance and achieves higher rates by adapting mapping parameters to current channel characteristics
2Productivity
If more transmitter chains are added to increase data rates, then communication capacity increases, but system complexity and cost increase
Solution Approach 1:
The patent allows the number of transmitted layers to exceed the number of receive antennas by using multiple transmit antennas with optimized constellation mappings. This partial use of available transmit resources enables higher data rates without requiring a proportional increase in receive antenna count, reducing system complexity
Solution Approach 2:
The patent makes existing transmitter chains perform multiple functions by implementing adaptive constellation mapping across multiple transmit antennas. The same hardware infrastructure supports multiple layers and multiple candidate mappings, maximizing the utility of existing equipment without adding proportional complexity
3Productivity
If adaptive constellation mapping with multiple candidate mappings is implemented, then interference is reduced and data rates increase, but processing complexity increases
Solution Approach 1:
The patent pre-calculates and stores multiple candidate constellation mappings before transmission. By preparing these mappings in advance based on channel estimates, the system avoids real-time complex calculations during data transmission, reducing processing complexity while maintaining high data rates
Solution Approach 2:
The patent uses channel transfer function estimates as feedback to select the optimal mapping combination from candidate mappings. This feedback mechanism enables the system to adapt to channel conditions and select the best mapping without exhaustive searching, balancing performance improvement with processing complexity
Data Source
AI summary
Systems and method for adaptive constellation mapping determine transmission formats for simultaneous transmission from multiple transmitter chains. The adaptive constellation mapping can select a winning combination of mappings using distance metrics. The distance metrics can be calculated from estimated received signal constellations at a multi-layer receiver. The multi-layer receiver can separate the data received from each of the transmitter chains. Additional systems and method can determine a whether to use adaptive constellation mapping or an alternate transmission format. Further systems and methods can determine a transmit arrangement that include selection of which of multiple transmitters will be a part of an adaptive constellation mapping transmission, the number of layers that will be transmitted by each transmitter, the transmitter chains that will be used, and which of multiple antennas that will be used.