MIMO Antenna Modulation Mapping for Balanced Diversity and Reception
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Solution Overview
Problem
Current MIMO communication systems face challenges in optimizing data transmission quality and diversity gain due to differences in modulation schemes and power levels between multiple antennas, leading to suboptimal data reception quality.
Innovation Solution
The proposed method involves using a precoding matrix that adjusts the power and phase of signals transmitted from multiple antennas, ensuring that the number of signal points in the I-Q plane for each symbol aligns with the modulation multi-level numbers, and employing different modulation schemes for each antenna to achieve high spatial diversity gain, while maintaining equalized average power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different modulation schemes are used for multiple antennas in MIMO communication, then spatial diversity gain is improved, but data reception quality deteriorates due to power level differences and signal distribution issues
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the power levels and signal distribution characteristics of each antenna based on channel conditions. The base station controls different power levels for signals transmitted from different antennas, and adjusts the number of signal points in the I-Q plane to match modulation multi-level numbers, thereby optimizing both spatial diversity gain and data reception quality
Solution Approach 2:
The system implements dynamic adaptation by allowing modulation schemes and power levels to vary across different antennas and time slots. The base station can change the number of signal points and power distribution dynamically based on channel state information, enabling the system to adapt to varying propagation conditions while maintaining optimal performance
2Reliability
If power levels are adjusted for different antennas to optimize signal distribution, then spatial diversity is improved, but device complexity increases due to additional power control mechanisms
Solution Approach 1:
The base station performs multiple functions using a unified power control mechanism: it simultaneously manages power distribution across antennas, controls the number of signal points in the I-Q plane, and adjusts modulation schemes. This multi-functional approach achieves spatial diversity improvement without requiring separate complex control systems for each function
Solution Approach 2:
The patent changes key parameters including power levels, number of signal points, and modulation scheme characteristics in a coordinated manner. By adjusting these parameters together rather than independently, the system achieves spatial diversity gain while avoiding the complexity that would arise from multiple independent control mechanisms
3Reliability
If the number of signal points in the I-Q plane is aligned with modulation multi-level numbers, then data integrity is improved, but manufacturing precision requirements increase for signal generation
Solution Approach 1:
The patent adjusts the number of signal points in the I-Q plane to match modulation multi-level numbers (e.g., aligning signal points with 16-QAM's 16 levels or 64-QAM's 64 levels). This parameter alignment ensures that quantization and signal generation can be performed with standard precision requirements, achieving data integrity without excessive manufacturing precision demands
Solution Approach 2:
The system creates equipotential conditions by ensuring that the signal distribution in the I-Q plane is optimally aligned with the modulation scheme's constellation points. This alignment equalizes the signal-to-noise ratio across different signal points, improving data integrity while maintaining practical signal generation requirements
Data Source
AI summary
In a transmission method according to one aspect of the present disclosure, a encoder performs error correction coding on an information bit string to generate a code word. A mapper modulates a first bit string in which the number of bits is the predetermined integral multiple of (X+Y) in the code word using a first scheme, the first scheme being a set of a modulation scheme in which an X-bit bit string is mapped to generate a first complex signal and a modulation scheme in which a Y-bit bit string is mapped to generate a second complex signal, and modulates a second bit string in which the first bit string is removed from the code word using a second scheme different from the first scheme.